Slim SEO <= 4.9.10 — Insecure Direct Object Reference to Authenticated (Contributor+) Arbitrary Post Meta Disclosure
CVE-2026-16957Published · Updated Action summary
Affected: ≤4.9.10Update to 4.9.11 or newer
All remediation steps- Severity
- Medium4.3
- CVSS
- 4.3CVSS 3.1 · CNA (Wordfence)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:NWhat does this vector mean?
AV:NAttack vector- Network
AC:LAttack complexity- Low
PR:LPrivileges required- Low
UI:NUser interaction- None
S:UScope- Unchanged
C:NConfidentiality- None
I:LIntegrity- Low
A:NAvailability- None
- Required access
- Unknown
- Exploit prediction (EPSS)
- No score
- CISA KEV
- Not listed
On this page8
Am I affected?
Slim SEO – AI SEO Plugin, Lightweight, Fast & Automated slim-seo
- Affected≤ 4.9.10
- Patched in4.9.11
Update to 4.9.11 or newer.
You are affected if you run ≤ 4.9.10. Version 4.9.11 and later are not affected by this issue.
- Check your version: in wp-admin go to Plugins → Installed Plugins and read the version under Slim SEO – AI SEO Plugin, Lightweight, Fast & Automated.
- No admin access? Run a passive check of your site. It reads public files only.
What to do
- Update to version 4.9.11, or a newer patched version
- Rotate administrator passwords and application secrets if the site ran a vulnerable version while publicly reachable.
- Watch Slim SEO – AI SEO Plugin, Lightweight, Fast & Automated to get an email when the next vulnerability is published.
Advisory
Source description from Wordfence Intelligence, credited to Shivamani Vastrala.
The Slim SEO plugin for WordPress is vulnerable to Insecure Direct Object Reference in versions up to, and including, 4.9.10. This is due to insufficient capability check in the can_edit_post() REST API permission callback using edit_posts and read_post instead of the post-specific edit_post capability. This makes it possible for authenticated attackers, with contributor-level access and above, to read arbitrary post meta for posts they do not have permission to edit.
Exploits & references
Proof-of-concept & detection
No public proof-of-concept or detection template is known for this vulnerability.
Advisories & patches
- Advisorywordfence.com
Related CVEs
More in Slim SEO – AI SEO Plugin, Lightweight, Fast & Automated
All 7| Severity | Vulnerability | CVE | Published |
|---|---|---|---|
| Medium5.4 | Authenticated (Subscriber+) Arbitrary Shortcode Execution via 'Biographical Info' User Meta ≤4.11.1Update to 4.11.2 | CVE-2026-104001 | |
| Medium4.3 | Authenticated (Contributor+) Insecure Direct Object Reference ≤4.10.0Update to 4.10.1 | CVE-2026-62113 | |
| Medium4.3 | Authenticated (Contributor+) Insufficient Authorization to Private Content Disclosure via 'object.ID' Parameter ≤4.9.8Update to 4.9.9 | CVE-2026-12408 | |
| Medium4.3 | Missing Authorization ≤4.6.2Update to 4.7.0 | CVE-2026-57429 | |
| Medium4.9 | Authenticated (Administrator+) SQL Injection ≤4.5.4Update to 4.5.5 | CVE-2025-49854 |
- Medium5.4Authenticated (Subscriber+) Arbitrary Shortcode Execution via 'Biographical Info' User Meta
≤4.11.1Update to 4.11.2
- Medium4.3Authenticated (Contributor+) Insecure Direct Object Reference
≤4.10.0Update to 4.10.1
- Medium4.3Authenticated (Contributor+) Insufficient Authorization to Private Content Disclosure via 'object.ID' Parameter
≤4.9.8Update to 4.9.9
- Medium4.3Missing Authorization
≤4.6.2Update to 4.7.0
- Medium4.9Authenticated (Administrator+) SQL Injection
≤4.5.4Update to 4.5.5
Timeline
CVE published
Severity medium, CVSS 4.3
Record last updated
Sources & licenses
Wordfence record- Vulnerability data
- Wordfence Intelligence. Copyright 2012-2026 Defiant Inc. Licensed under the CC BY-SA 4.0.
- CVE® identifiers
- Copyright 1999-2026 The MITRE Corporation. Used under the CVE Program. CVE® is a registered trademark of The MITRE Corporation.
- CVSS / CWE
- National Vulnerability Database (NVD), shown unmodified. This product uses the NVD API but is not endorsed or certified by the NVD.
- VulnCrest content
- Summary, remediation guidance and page layout © VulnCrest. Not sourced from NVD.