Slim SEO: known security problems
7 known security problems reported for this WordPress plugin, with the affected versions, the fix and what to do.
Updated
In short
There are 7 known security problems on this page. Each one has a fixed version. Updating to version 4.11.2 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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Anyone with an account on your site, even a basic one 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 4.11.1
- Fixed in
- 4.11.2
- What to do
- If your site has an affected version, update Slim SEO to version 4.11.2 or newer.
- Official ID
- CVE-2026-104001
- Report title
- Slim SEO <= 4.11.1 - Authenticated (Subscriber+) Arbitrary Shortcode Execution via 'Biographical Info' User Meta
- First reported
- Sources
- Wordfence, seen
Someone with a contributor account on your site could use it to harm your site (up to and including 4.10.0)
A trusted security source confirmed it. If your site has an affected version, fix it this week.
- Affected versions
- Up to and including 4.10.0
- Fixed in
- 4.10.1
- What to do
- If your site has an affected version, update Slim SEO to version 4.10.1 or newer.
- Official ID
- CVE-2026-62113
- Report title
- Slim SEO – AI SEO Plugin, Lightweight, Fast & Automated <= 4.10.0 - Authenticated (Contributor+) Insecure Direct Object Reference
- First reported
- Sources
- Wordfence, seen
Someone with a contributor account on your site could use it to harm your site (up to and including 4.9.10)
A trusted security source confirmed it. If your site has an affected version, fix it this week.
- Affected versions
- Up to and including 4.9.10
- Fixed in
- 4.9.11
- What to do
- If your site has an affected version, update Slim SEO to version 4.9.11 or newer.
- Official ID
- CVE-2026-16957
- Report title
- Slim SEO <= 4.9.10 - Insecure Direct Object Reference to Authenticated (Contributor+) Arbitrary Post Meta Disclosure
- First reported
- Sources
- Wordfence, seen
Someone with a contributor account on your site could use it to harm your site (up to and including 4.9.8)
A trusted security source confirmed it. If your site has an affected version, fix it this week.
- Affected versions
- Up to and including 4.9.8
- Fixed in
- 4.9.9
- What to do
- If your site has an affected version, update Slim SEO to version 4.9.9 or newer.
- Official ID
- CVE-2026-12408
- Report title
- Slim SEO <= 4.9.8 - Authenticated (Contributor+) Insufficient Authorization to Private Content Disclosure via 'object.ID' Parameter
- 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 4.6.2
- Fixed in
- 4.7.0
- What to do
- If your site has an affected version, update Slim SEO to version 4.7.0 or newer.
- Official ID
- CVE-2026-57429
- Report title
- Slim SEO – A Fast & Automated SEO Plugin For WordPress <= 4.6.2 - Missing Authorization
- First reported
- Sources
- Wordfence, seen
Someone who already has an admin account 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 4.5.4
- Fixed in
- 4.5.5
- What to do
- If your site has an affected version, update Slim SEO to version 4.5.5 or newer.
- Official ID
- CVE-2025-49854
- Report title
- Slim SEO <= 4.5.4 - Authenticated (Administrator+) SQL Injection
- First reported
- Sources
- Wordfence, seen
Someone with a contributor account on your site 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 4.5.3
- Fixed in
- 4.5.4
- What to do
- If your site has an affected version, update Slim SEO to version 4.5.4 or newer.
- Official ID
- CVE-2025-4611
- Report title
- Slim SEO <= 4.5.3 - Authenticated (Contributor+) Stored Cross-Site Scripting via slim_seo_breadcrumbs Shortcode
- 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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