CVE-2026-16957 Slim SEO < 4.9.11 - Contributor+ Arbitrary Post Meta Disclosure
Contributors can read arbitrary post meta data, including private keys, from published posts they do not own due to insufficient authorization checks.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-16957?
CVE-2026-16957 is a low-severity missing authorization vulnerability in Unknown Slim SEO, published on 9 Aug 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official description
The Slim SEO WordPress plugin before 4.9.11 does not restrict a post-meta preview feature to posts the user is allowed to edit, verifying only read access, allowing users with the Contributor role to read arbitrary post meta, including protected and private keys, of published posts they do not own, including password-protected posts and posts of non-public post types.
Weakness: CWE-639
Which versions are affected by CVE-2026-16957?
How do I fix CVE-2026-16957?
No fix has been published for CVE-2026-16957 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-2026-16957 being exploited?
There is no known exploitation of CVE-2026-16957 in the wild and no public exploit code.
Sources
Also known as GHSA-c8x4-7vmf-m6pv.