CVE-2026-12408 Missing authorization in Slim SEO – A Fast & Automated SEO Plugin For WordPress
Authenticated contributors can read private or draft post content via an insecure REST API endpoint in the Slim SEO WordPress plugin.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-12408?
CVE-2026-12408 is a medium-severity missing authorization vulnerability in rilwis Slim SEO – A Fast & Automated SEO Plugin For WordPress, published on 1 Jul 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Weakness: CWE-200
Which versions are affected by CVE-2026-12408?
How do I fix CVE-2026-12408?
No fix has been published for CVE-2026-12408 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-12408 being exploited?
There is no known exploitation of CVE-2026-12408 in the wild and no public exploit code.
Sources
Also known as GHSA-h4h4-h3cx-x6xc.