Simple Membership: known security problems
39 known security problems reported for this WordPress plugin, with the affected versions, the fix and what to do.
Updated
In short
There are 39 known security problems on this page. Each one has a fixed version. Updating to version 4.8.5 or newer covers every fixed problem listed here.
Based on public reports. Check the plugin’s changelog. Watchfox AI may be wrong.
Get an email when your site is affected: install Watchfox AI (free)
Anyone with an account on your site, even a basic one could plant harmful code that runs for your visitors or admins
A trusted security source confirmed it. If your site has an affected version, fix it this week.
- Affected versions
- Up to and including 4.8.4
- Fixed in
- 4.8.5
- What to do
- If your site has an affected version, update Simple Membership to version 4.8.5 or newer.
- Official ID
- CVE-2026-103427
- Report title
- Simple Membership <= 4.8.4 - Authenticated (Subscriber+) Stored Cross-Site Scripting via Country Field
- First reported
- Sources
- Wordfence, seen
Someone could use it to harm your site (up to and including 4.8.2)
A trusted security source confirmed it. If your site has an affected version, fix it this week.
- Affected versions
- Up to and including 4.8.2
- Fixed in
- 4.8.3
- What to do
- If your site has an affected version, update Simple Membership to version 4.8.3 or newer.
- Official ID
- CVE-2026-88785
- Report title
- Simple Membership <= 4.8.2 - Information Exposure
- First reported
- Sources
- Wordfence, seen
A stranger could take over your site as an admin (up to and including 4.8.3)
A trusted security source confirmed it. If your site has an affected version, fix it this week.
- Affected versions
- Up to and including 4.8.3
- Fixed in
- 4.8.4
- What to do
- If your site has an affected version, update Simple Membership to version 4.8.4 or newer.
- Official ID
- CVE-2026-97337
- Report title
- Simple Membership <= 4.8.3 - Missing Authorization to Unauthenticated Account Takeover and Sensitive Information Disclosure via 'email' Parameter on Activation Endpoints
- First reported
- Sources
- Wordfence, seen
Someone could do things on your site they should not be allowed to (up to and including 4.8.2)
A trusted security source confirmed it. If your site has an affected version, fix it this week.
- Affected versions
- Up to and including 4.8.2
- Fixed in
- 4.8.3
- What to do
- If your site has an affected version, update Simple Membership to version 4.8.3 or newer.
- Official ID
- CVE-2026-74000
- Report title
- Simple Membership <= 4.8.2 - Missing Authorization
- First reported
- Sources
- Wordfence, seen
Someone could do things on your site they should not be allowed to (before 4.7.8)
A trusted security source confirmed it. If your site has an affected version, fix it this week.
- Affected versions
- Before 4.7.8
- Fixed in
- 4.7.8
- What to do
- If your site has an affected version, update Simple Membership to version 4.7.8 or newer.
- Official ID
- CVE-2026-88764
- Report title
- Simple Membership < 4.7.8 - Missing Authorization
- First reported
- Sources
- Wordfence, seen
A stranger could take over your site as an admin (up to and including 4.8.1)
A trusted security source confirmed it. If your site has an affected version, fix it this week.
- Affected versions
- Up to and including 4.8.1
- Fixed in
- 4.8.2
- What to do
- If your site has an affected version, update Simple Membership to version 4.8.2 or newer.
- Official ID
- CVE-2026-77194
- Report title
- Simple Membership <= 4.8.1 - Unauthenticated Authentication Bypass to Administrator Account Takeover via Multisite Identity Binding
- First reported
- Sources
- Wordfence, seen
Someone could do things on your site they should not be allowed to (up to and including 4.7.8)
A trusted security source confirmed it. If your site has an affected version, fix it this week.
- Affected versions
- Up to and including 4.7.8
- Fixed in
- 4.7.9
- What to do
- If your site has an affected version, update Simple Membership to version 4.7.9 or newer.
- Official ID
- CVE-2026-66712
- Report title
- Simple Membership <= 4.7.8 - Missing Authorization
- First reported
- Sources
- Wordfence, seen
Someone could do things on your site they should not be allowed to (up to and including 4.7.7)
A trusted security source confirmed it. If your site has an affected version, fix it this week.
- Affected versions
- Up to and including 4.7.7
- Fixed in
- 4.7.8
- What to do
- If your site has an affected version, update Simple Membership to version 4.7.8 or newer.
- Official ID
- CVE-2026-15930
- Report title
- Simple Membership <= 4.7.7 - Missing Authorization
- First reported
- Sources
- Wordfence, seen
A stranger could plant harmful code that runs for your visitors or admins (up to and including 4.7.7)
A trusted security source confirmed it. If your site has an affected version, fix it this week.
- Affected versions
- Up to and including 4.7.7
- Fixed in
- 4.7.8
- What to do
- If your site has an affected version, update Simple Membership to version 4.7.8 or newer.
- Official ID
- CVE-2026-15931
- Report title
- Simple Membership <= 4.7.7 - Unauthenticated Stored Cross-Site Scripting
- First reported
- Sources
- Wordfence, seen
A stranger could use it to harm your site (up to and including 4.7.6)
A trusted security source confirmed it. If your site has an affected version, fix it this week.
- Affected versions
- Up to and including 4.7.6
- Fixed in
- 4.7.7
- What to do
- If your site has an affected version, update Simple Membership to version 4.7.7 or newer.
- Official ID
- CVE-2026-14936
- Report title
- Simple Membership <= 4.7.6 - Unauthenticated Payment Verification Bypass
- First reported
- Sources
- Wordfence, seen
A stranger could do things on your site they should not be allowed to
A trusted security source confirmed it. If your site has an affected version, fix it this week.
- Affected versions
- Up to and including 4.7.5
- Fixed in
- 4.7.6
- What to do
- If your site has an affected version, update Simple Membership to version 4.7.6 or newer.
- Official ID
- CVE-2026-12093
- Report title
- Simple Membership <= 4.7.5 - Missing Authorization to Unauthenticated Arbitrary Member Account Deactivation via Forged Stripe 'charge.refunded' Webhook
- First reported
- Sources
- Wordfence, seen
A stranger could plant harmful code that runs for your visitors or admins (up to and including 4.7.4)
A trusted security source confirmed it. If your site has an affected version, fix it this week.
- Affected versions
- Up to and including 4.7.4
- Fixed in
- 4.7.5
- What to do
- If your site has an affected version, update Simple Membership to version 4.7.5 or newer.
- Official ID
- CVE-2026-11855
- Report title
- Simple Membership <= 4.7.4 - Unauthenticated Stored Cross-Site Scripting
- First reported
- Sources
- Wordfence, seen
A stranger could plant harmful code that runs for your visitors or admins (up to and including 4.7.2)
A trusted security source confirmed it. If your site has an affected version, fix it this week.
- Affected versions
- Up to and including 4.7.2
- Fixed in
- 4.7.3
- What to do
- If your site has an affected version, update Simple Membership to version 4.7.3 or newer.
- Official ID
- CVE-2026-42663
- Report title
- Simple Membership <= 4.7.2 - Unauthenticated Stored Cross-Site Scripting
- First reported
- Sources
- Wordfence, seen
Someone could do things on your site they should not be allowed to (up to and including 4.7.1)
A trusted security source confirmed it. If your site has an affected version, fix it this week.
- Affected versions
- Up to and including 4.7.1
- Fixed in
- 4.7.2
- What to do
- If your site has an affected version, update Simple Membership to version 4.7.2 or newer.
- Official ID
- CVE-2026-34886
- Report title
- Simple Membership <= 4.7.1 - Missing Authorization
- First reported
- Sources
- Wordfence, seen
A stranger could use it to harm your site (up to and including 4.7.0)
A trusted security source confirmed it. If your site has an affected version, fix it this week.
- Affected versions
- Up to and including 4.7.0
- Fixed in
- 4.7.1
- What to do
- If your site has an affected version, update Simple Membership to version 4.7.1 or newer.
- Official ID
- CVE-2026-1461
- Report title
- Simple Membership <= 4.7.0 - Unauthenticated Improper Handling of Missing Values
- First reported
- Sources
- Wordfence, seen
Someone could do things on your site they should not be allowed to (up to and including 4.6.9)
A trusted security source confirmed it. If your site has an affected version, fix it this week.
- Affected versions
- Up to and including 4.6.9
- Fixed in
- 4.7.0
- What to do
- If your site has an affected version, update Simple Membership to version 4.7.0 or newer.
- Official ID
- CVE-2026-25308
- Report title
- Simple Membership <= 4.6.9 - Missing Authorization
- First reported
- Sources
- Wordfence, seen
Someone who already has an admin account could plant harmful code that runs for your visitors or admins
A trusted security source confirmed it. If your site has an affected version, fix it this week.
- Affected versions
- Up to and including 4.6.3
- Fixed in
- 4.6.4
- What to do
- If your site has an affected version, update Simple Membership to version 4.6.4 or newer.
- Official ID
- CVE-2025-49333
- Report title
- Simple Membership <= 4.6.3 - Authenticated (Administrator+) Stored Cross-Site Scripting
- First reported
- Sources
- Wordfence, seen
Someone could use it to harm your site (up to and including 4.5.5)
A trusted security source confirmed it. If your site has an affected version, fix it this week.
- Affected versions
- Up to and including 4.5.5
- Fixed in
- 4.5.6
- What to do
- If your site has an affected version, update Simple Membership to version 4.5.6 or newer.
- Official ID
- CVE-2024-11088
- Report title
- Simple Membership <= 4.5.5 - Exposure of Private Personal Information to an Unauthorized Actor
- First reported
- Sources
- Wordfence, seen
A stranger could send your visitors from your site to a harmful site
A trusted security source confirmed it. If your site has an affected version, fix it this week.
- Affected versions
- Up to and including 4.5.3
- Fixed in
- 4.5.4
- What to do
- If your site has an affected version, update Simple Membership to version 4.5.4 or newer.
- Official ID
- CVE-2024-49682
- Report title
- Simple Membership <= 4.5.3 - Unauthenticated Open Redirect
- First reported
- Sources
- Wordfence, seen
Someone with a contributor account on your site could plant harmful code that runs for your visitors or admins (up to and including 4.4.5)
A trusted security source confirmed it. If your site has an affected version, fix it this week.
- Affected versions
- Up to and including 4.4.5
- Fixed in
- 4.4.6
- What to do
- If your site has an affected version, update Simple Membership to version 4.4.6 or newer.
- Official ID
- CVE-2024-4383
- Report title
- Simple Membership <= 4.4.5 - Authenticated(Contributor+) Stored Cross-Site Scripting via Shortcode
- First reported
- Sources
- Wordfence, seen
Someone with a contributor account on your site could plant harmful code that runs for your visitors or admins (up to and including 4.4.3)
A trusted security source confirmed it. If your site has an affected version, fix it this week.
- Affected versions
- Up to and including 4.4.3
- Fixed in
- 4.4.4
- What to do
- If your site has an affected version, update Simple Membership to version 4.4.4 or newer.
- Official ID
- CVE-2024-3730
- Report title
- Simple Membership <= 4.4.3 - Authenticated(Contributor+) Stored Cross-Site Scripting via Shortcode
- First reported
- Sources
- Wordfence, seen
A stranger could plant harmful code that runs for your visitors or admins (up to and including 4.4.2)
A trusted security source confirmed it. If your site has an affected version, fix it this week.
- Affected versions
- Up to and including 4.4.2
- Fixed in
- 4.4.3
- What to do
- If your site has an affected version, update Simple Membership to version 4.4.3 or newer.
- Official ID
- CVE-2024-1985
- Report title
- Simple Membership <= 4.4.2 - Unauthenticated Stored Self-Based Cross-Site Scripting
- First reported
- Sources
- Wordfence, seen
Someone could send your visitors from your site to a harmful site
A trusted security source confirmed it. If your site has an affected version, fix it this week.
- Affected versions
- Up to and including 4.4.1
- Fixed in
- 4.4.2
- What to do
- If your site has an affected version, update Simple Membership to version 4.4.2 or newer.
- Official ID
- CVE-2024-22308
- Report title
- Simple Membership <= 4.4.1 - Open Redirect
- First reported
- Sources
- Wordfence, seen
Someone could plant harmful code that runs for your visitors or admins (before 4.3.9)
A trusted security source confirmed it. If your site has an affected version, fix it this week.
- Affected versions
- Before 4.3.9
- Fixed in
- 4.3.9
- What to do
- If your site has an affected version, update Simple Membership to version 4.3.9 or newer.
- Official ID
- CVE-2023-50376
- Report title
- Simple Membership <= 4.3.8 - Reflected Cross-Site Scripting
- First reported
- Sources
- Wordfence, seen
Someone could plant harmful code that runs for your visitors or admins (up to and including 4.3.8)
A trusted security source confirmed it. If your site has an affected version, fix it this week.
- Affected versions
- Up to and including 4.3.8
- Fixed in
- 4.3.9
- What to do
- If your site has an affected version, update Simple Membership to version 4.3.9 or newer.
- Official ID
- CVE-2023-6882
- Report title
- Simple Membership <= 4.3.8 - Reflected Cross-Site Scripting Vulnerability via environment_mode
- First reported
- Sources
- Wordfence, seen
Someone could take over your site as an admin (up to and including 4.3.4)
A trusted security source confirmed it. If your site has an affected version, fix it this week.
- Affected versions
- Up to and including 4.3.4
- Fixed in
- 4.3.5
- What to do
- If your site has an affected version, update Simple Membership to version 4.3.5 or newer.
- Official ID
- CVE-2023-41957
- Report title
- Simple Membership <= 4.3.4 - Privilege escalation via Registration
- First reported
- Sources
- Wordfence, seen
Someone could take over your site as an admin (up to and including 4.3.4) (2)
A trusted security source confirmed it. If your site has an affected version, fix it this week.
- Affected versions
- Up to and including 4.3.4
- Fixed in
- 4.3.5
- What to do
- If your site has an affected version, update Simple Membership to version 4.3.5 or newer.
- Official ID
- CVE-2023-41956
- Report title
- Simple Membership <= 4.3.4 - Account Takeover via Password Reset
- First reported
- Sources
- Wordfence, seen
Someone could plant harmful code that runs for your visitors or admins (up to and including 4.3.5)
A trusted security source confirmed it. If your site has an affected version, fix it this week.
- Affected versions
- Up to and including 4.3.5
- Fixed in
- 4.3.6
- What to do
- If your site has an affected version, update Simple Membership to version 4.3.6 or newer.
- Official ID
- CVE-2023-4719
- Report title
- Simple Membership <= 4.3.5 - Reflected Cross-Site Scripting
- First reported
- Sources
- Wordfence, seen
Someone with a contributor account on your site could use it to harm your site
A trusted security source confirmed it. If your site has an affected version, fix it this week.
- Affected versions
- Up to and including 4.2.1
- Fixed in
- 4.2.2
- What to do
- If your site has an affected version, update Simple Membership to version 4.2.2 or newer.
- Official ID
- CVE-2022-4469
- Report title
- Simple Membership <= 4.2.1 - Authenticated (Contributor+) Cross Site Scripting via shortcode
- First reported
- Sources
- Wordfence, seen
Someone could take over your site as an admin (up to and including 4.1.2)
A trusted security source confirmed it. If your site has an affected version, fix it this week.
- Affected versions
- Up to and including 4.1.2
- Fixed in
- 4.1.3
- What to do
- If your site has an affected version, update Simple Membership to version 4.1.3 or newer.
- Official ID
- CVE-2022-2317
- Report title
- Simple Membership <= 4.1.2 - Membership Privilege Escalation
- First reported
- Sources
- Wordfence, seen
Someone could take over your site as an admin (up to and including 4.1.2) (2)
A trusted security source confirmed it. If your site has an affected version, fix it this week.
- Affected versions
- Up to and including 4.1.2
- Fixed in
- 4.1.3
- What to do
- If your site has an affected version, update Simple Membership to version 4.1.3 or newer.
- Official ID
- CVE-2022-2273
- Report title
- Simple Membership <= 4.1.2 - Membership Privilege Escalation
- First reported
- Sources
- Wordfence, seen
Someone could plant harmful code that runs for your visitors or admins (up to and including 4.1.0)
A trusted security source confirmed it. If your site has an affected version, fix it this week.
- Affected versions
- Up to and including 4.1.0
- Fixed in
- 4.1.1
- What to do
- If your site has an affected version, update Simple Membership to version 4.1.1 or newer.
- Official ID
- CVE-2022-1724
- Report title
- Simple Membership <= 4.1.0 - Reflected Cross-Site Scripting
- First reported
- Sources
- Wordfence, seen
Someone could trick a logged-in admin into changing settings without knowing (before 4.1.0)
A trusted security source confirmed it. If your site has an affected version, fix it this week.
- Affected versions
- Before 4.1.0
- Fixed in
- 4.1.0
- What to do
- If your site has an affected version, update Simple Membership to version 4.1.0 or newer.
- Official ID
- CVE-2022-0681
- Report title
- Simple Membership <= 4.0.9 - Cross-Site Request Forgery to Arbitrary Transaction Deletion
- First reported
- Sources
- Wordfence, seen
Someone could trick a logged-in admin into changing settings without knowing (before 4.0.9)
A trusted security source confirmed it. If your site has an affected version, fix it this week.
- Affected versions
- Before 4.0.9
- Fixed in
- 4.0.9
- What to do
- If your site has an affected version, update Simple Membership to version 4.0.9 or newer.
- Official ID
- CVE-2022-0328
- Report title
- Simple Membership <= 4.0.8 - Cross-Site Request Forgery to Arbitrary Member Deletion
- First reported
- Sources
- Wordfence, seen
Someone could read or change the data in your site’s database
A trusted security source confirmed it. If your site has an affected version, fix it this week.
- Affected versions
- Up to and including 4.0.3
- Fixed in
- 4.0.4
- What to do
- If your site has an affected version, update Simple Membership to version 4.0.4 or newer.
- Report title
- Simple Membership <= 4.0.3 - Authenticated (Admin+) SQL Injections
- First reported
- Sources
- Wordfence, seen
Someone could trick a logged-in admin into changing settings without knowing (before 3.8.5)
A trusted security source confirmed it. If your site has an affected version, fix it this week.
- Affected versions
- Before 3.8.5
- Fixed in
- 3.8.5
- What to do
- If your site has an affected version, update Simple Membership to version 3.8.5 or newer.
- Official ID
- CVE-2019-14328
- Report title
- Simple Membership <= 3.8.4 - Cross-Site Request Forgery
- First reported
- Sources
- Wordfence, seen
Someone could plant harmful code that runs for your visitors or admins (before 3.5.7)
A trusted security source confirmed it. If your site has an affected version, fix it this week.
- Affected versions
- Before 3.5.7
- Fixed in
- 3.5.7
- What to do
- If your site has an affected version, update Simple Membership to version 3.5.7 or newer.
- Official ID
- CVE-2017-18499
- Report title
- Simple Membership <= 3.5.6 - Cross-Site Scripting
- First reported
- Sources
- Wordfence, seen
Someone could trick a logged-in admin into changing settings without knowing (up to and including 3.3.2)
A trusted security source confirmed it. If your site has an affected version, fix it this week.
- Affected versions
- Up to and including 3.3.2
- Fixed in
- 3.3.3
- What to do
- If your site has an affected version, update Simple Membership to version 3.3.3 or newer.
- Official ID
- CVE-2016-10884
- Report title
- Simple Membership <= 3.3.2 - Multiple Cross-Site Request Forgery
- First reported
- Sources
- Wordfence, seen
Someone could plant harmful code that runs for your visitors or admins (before 3.2.9)
A trusted security source confirmed it. If your site has an affected version, fix it this week.
- Affected versions
- Before 3.2.9
- Fixed in
- 3.2.9
- What to do
- If your site has an affected version, update Simple Membership to version 3.2.9 or newer.
- Report title
- Simple Membership < 3.2.9 - Reflected Cross-Site Scripting
- First reported
- Sources
- Wordfence, seen
Where this comes from
We collect these reports from public security sources and rewrite them in plain words. Each problem shows its sources and the date we first saw it. This page never says whether your own site is affected: only a check of your site’s versions can tell.
Get an email when your site is affected.
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