MailOptin – Popup, Optin Forms & Email Newsletters for Mailchimp, HubSpot, AWeber Etc.: known security problems
8 known security problems reported for this WordPress plugin, with the affected versions, the fix and what to do.
Updated
In short
There are 8 known security problems on this page. Each one has a fixed version. Updating to version 1.2.78.7 or newer covers every fixed problem listed here.
Based on public reports. Check the plugin’s changelog. Watchfox AI may be wrong.
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A stranger could take over your site as an admin (up to and including 1.2.78.6)
A trusted security source confirmed it. If your site has an affected version, fix it this week.
- Affected versions
- Up to and including 1.2.78.6
- Fixed in
- 1.2.78.7
- What to do
- If your site has an affected version, update MailOptin – Popup, Optin Forms & Email Newsletters for Mailchimp, HubSpot, AWeber Etc. to version 1.2.78.7 or newer.
- Official ID
- CVE-2026-109515
- Report title
- MailOptin <= 1.2.78.6 - Unauthenticated Privilege Escalation to 'form_custom_field_mappings' Parameter
- 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 1.2.78.0)
A trusted security source confirmed it. If your site has an affected version, fix it this week.
- Affected versions
- Up to and including 1.2.78.0
- Fixed in
- 1.2.78.1
- What to do
- If your site has an affected version, update MailOptin – Popup, Optin Forms & Email Newsletters for Mailchimp, HubSpot, AWeber Etc. to version 1.2.78.1 or newer.
- Official ID
- CVE-2026-66703
- Report title
- MailOptin – Popup, Optin Forms & Email Newsletters for Mailchimp, HubSpot, AWeber Etc. <= 1.2.78.0 - Authenticated (Contributor+) Stored Cross-Site Scripting
- First reported
- Sources
- Wordfence, seen
A stranger could take over your site as an admin (up to and including 1.2.77.3)
A trusted security source confirmed it. If your site has an affected version, fix it this week.
- Affected versions
- Up to and including 1.2.77.3
- Fixed in
- 1.2.78.0
- What to do
- If your site has an affected version, update MailOptin – Popup, Optin Forms & Email Newsletters for Mailchimp, HubSpot, AWeber Etc. to version 1.2.78.0 or newer.
- Official ID
- CVE-2026-57813
- Report title
- MailOptin – Popup, Optin Forms & Email Newsletters for Mailchimp, HubSpot, AWeber Etc. <= 1.2.77.3 - Unauthenticated Privilege Escalation
- 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 1.2.75.0
- Fixed in
- 1.2.75.1
- What to do
- If your site has an affected version, update MailOptin – Popup, Optin Forms & Email Newsletters for Mailchimp, HubSpot, AWeber Etc. to version 1.2.75.1 or newer.
- Official ID
- CVE-2025-58596
- Report title
- MailOptin <= 1.2.75.0 - Authenticated (Administrator+) Stored Cross-Site Scripting
- 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 1.2.70.3)
A trusted security source confirmed it. If your site has an affected version, fix it this week.
- Affected versions
- Up to and including 1.2.70.3
- Fixed in
- 1.2.70.4
- What to do
- If your site has an affected version, update MailOptin – Popup, Optin Forms & Email Newsletters for Mailchimp, HubSpot, AWeber Etc. to version 1.2.70.4 or newer.
- Official ID
- CVE-2024-8628
- Report title
- Popup, Optin Form & Email Newsletters for Mailchimp, HubSpot, AWeber – MailOptin <= 1.2.70.3 - Authenticated (Contributor+) Stored Cross-Site Scripting
- First reported
- Sources
- Wordfence, seen
Someone could use it to harm your site (from 1.2.54.0 up to and including 1.2.54.0)
A trusted security source confirmed it. If your site has an affected version, fix it this week.
- Affected versions
- From 1.2.54.0 up to and including 1.2.54.0
- Fixed in
- 1.2.54.1
- What to do
- If your site has an affected version, update MailOptin – Popup, Optin Forms & Email Newsletters for Mailchimp, HubSpot, AWeber Etc. to version 1.2.54.1 or newer.
- Official ID
- CVE-2023-23980
- Report title
- MailOptin <= 1.2.54.0 - Authenticated (Admin+) Cross Site Scripting
- First reported
- Sources
- Wordfence, seen
Someone 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 1.2.49.0
- Fixed in
- 1.2.50.0
- What to do
- If your site has an affected version, update MailOptin – Popup, Optin Forms & Email Newsletters for Mailchimp, HubSpot, AWeber Etc. to version 1.2.50.0 or newer.
- Official ID
- CVE-2022-36340
- Report title
- MailOptin <= 1.2.49.0 - Missing Authorization to Cache Deletion
- First reported
- Sources
- Wordfence, seen
Someone could use it to harm your site (up to and including 1.2.35.1)
A trusted security source confirmed it. If your site has an affected version, fix it this week.
- Affected versions
- Up to and including 1.2.35.1
- Fixed in
- 1.2.35.2
- What to do
- If your site has an affected version, update MailOptin – Popup, Optin Forms & Email Newsletters for Mailchimp, HubSpot, AWeber Etc. to version 1.2.35.2 or newer.
- Report title
- Popup, Optin Form & Email Newsletters for Mailchimp, HubSpot, AWeber – MailOptin <= 1.2.35.1 - Authorization Bypass
- 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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