CVE-2026-12408

Vulnerability Description

The Slim SEO – A Fast & Automated SEO Plugin For WordPress plugin for WordPress is vulnerable to Unauthorized Private Content Disclosure in all versions up to, and including, 4.9.8 via the `/wp-json/slim-seo/meta-tags/ai` REST API endpoint. This is due to the endpoint's `permission_callback` performing only a top-level `edit_posts` capability check without verifying that the requesting user has read access to the specific post supplied via the `object.ID` parameter, allowing the `generate` function to pass the attacker-controlled post ID to `Data::get_post_content()`, which calls `get_post()` regardless of post status or ownership. This makes it possible for authenticated attackers with Contributor-level access and above to retrieve AI-generated summaries of the raw `post_content` of arbitrary posts they are not authorized to view — including private posts, drafts, pending, future, and password-protected content authored by other users — with the substance of the protected content disclosed via the HTTP response.

CVSS Score

Related Weaknesses (CWE)

References

• https://plugins.trac.wordpress.org/browser/slim-seo/tags/4.9.5/src/MetaTags/AI.p
• https://plugins.trac.wordpress.org/browser/slim-seo/tags/4.9.5/src/MetaTags/AI.p
• https://plugins.trac.wordpress.org/browser/slim-seo/tags/4.9.5/src/MetaTags/Data
• https://plugins.trac.wordpress.org/browser/slim-seo/tags/4.9.8/src/MetaTags/AI.p
• https://plugins.trac.wordpress.org/browser/slim-seo/tags/4.9.8/src/MetaTags/AI.p
• https://plugins.trac.wordpress.org/browser/slim-seo/tags/4.9.8/src/MetaTags/Data
• https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&old
• https://www.wordfence.com/threat-intel/vulnerabilities/id/6e6603a0-8f35-49fb-a51