Answer in brief
CVE-2026-16957 records a Unknown severity vulnerability in Slim SEO < 4.9.11 - Contributor+ Arbitrary Post Meta Disclosure. The current sources do not mark it as known exploited. The current feed maps Unknown/Slim SEO (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Unknown/Slim SEO (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Unknown/Slim SEOgeneric | >=0 <4.9.11 | 4.9.11 |
Published upstream
Aug 9, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 9, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 9, 2026
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.
Quoted source text, attributed separately from HOL analysis.
Answer in brief
CVE-2026-16957 records a Unknown severity vulnerability in Slim SEO < 4.9.11 - Contributor+ Arbitrary Post Meta Disclosure. The current sources do not mark it as known exploited. The current feed maps Unknown/Slim SEO (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Unknown/Slim SEO (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Unknown/Slim SEOgeneric | >=0 <4.9.11 | 4.9.11 |
Published upstream
Aug 9, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 9, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 9, 2026
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.
Quoted source text, attributed separately from HOL analysis.