CVE-2026-16957: Slim SEO < 4.9.11 - Contributor+ Arbitrary Post Meta Disclosure
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.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
wordpress/Slim SEOto a version that resolves this vulnerability.Fixed in 4.9.11 - Configuration
Ensure the post-meta preview feature enforces edit-level authorization (not just read access) so Contributors cannot view arbitrary post meta (including protected/private keys) for posts they do not own, including password-protected and non-public post types.
Slim SEO (WordPress plugin) post-meta preview access control = restrict to posts the user is allowed to edit