Slim SEO < 4.9.11 - Contributor+ Arbitrary Post Meta Disclosure
Priority LOW 13CWE-639Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- High
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- Low · None · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-639.
Summary
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.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00299 22nd percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by the CNA
Fix Fixed Slim SEO (Unknown): 4.9.11
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Unknown | Slim SEO | before 4.9.11 | 4.9.11 | Patch available | CNA |
- Slim SEO VendorUnknown Affected before 4.9.11 Fixed in 4.9.11 Patch available CNA
Remediation
- Fix · CNA Slim SEO (Unknown) Fixed in 4.9.11
Timeline
- 2026-10-02 Threatist record created from CVE-2026-16957
- 2026-10-03 Alias added: GHSA-c8x4-7vmf-m6pv
References
Sources
- CVE-2026-16957 · CVE Program
- CVE-2026-16957 · NVD
- FIRST EPSS
- GHSA-c8x4-7vmf-m6pv · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences