Slim SEO <= 4.9.8 — Authenticated (Contributor+) Insufficient Authorization to Private Content Disclosure via 'object.ID' Parameter
CVE-2026-12408Published · Updated Action summary
Affected: ≤4.9.8Update to 4.9.9 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:L/I:N/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:LConfidentiality- Low
I:NIntegrity- None
A:NAvailability- None
- Weakness
- CWE-200 Information Exposure
- 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≤ 4.9.8
- Patched in4.9.9
Update to 4.9.9 or newer.
You are affected if you run ≤ 4.9.8. Version 4.9.9 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 4.9.9, 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 Abu Hurayra (HurayraIIT).
The Slim SEO – A Fast & Automated SEO Plugin For WordPress plugin for WordPress is vulnerable to Unauthorized Private Content Disclosure in all versions up to, and including, 4.9.8 via the `/wp-json/slim-seo/meta-tags/ai` REST API endpoint. This is due to the endpoint's `permission_callback` performing only a top-level `edit_posts` capability check without verifying that the requesting user has read access to the specific post supplied via the `object.ID` parameter, allowing the `generate` function to pass the attacker-controlled post ID to `Data::get_post_content()`, which calls `get_post()` regardless of post status or ownership. This makes it possible for authenticated attackers with Contributor-level access and above to retrieve AI-generated summaries of the raw `post_content` of arbitrary posts they are not authorized to view — including private posts, drafts, pending, future, and password-protected content authored by other users — with the substance of the protected content disclosed via the HTTP response.
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 | Insecure Direct Object Reference to Authenticated (Contributor+) Arbitrary Post Meta Disclosure ≤4.9.10Update to 4.9.11 | CVE-2026-16957 | |
| 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
- Medium4.3Insecure Direct Object Reference to Authenticated (Contributor+) Arbitrary Post Meta Disclosure
≤4.9.10Update to 4.9.11
- Medium4.3Missing Authorization
≤4.6.2Update to 4.7.0
- Medium4.9Authenticated (Administrator+) SQL Injection
≤4.5.4Update to 4.5.5
Same weakness (Information Exposure)
All Information Exposure| Severity | Vulnerability | CVE | Published |
|---|---|---|---|
| High7.2 | Unauthenticated Stored Cross-Site Scripting via Comment User-Agent Header | CVE-2026-120688 | |
| Critical9.8 | Unauthenticated Arbitrary File Upload via File Upload via Public Form Submission | CVE-2026-125055 | |
| Critical9.8 | Unauthenticated PHP Object Injection to Remote Code Execution via 'form' Parameter | CVE-2026-119077 | |
| Medium5.3 | Unauthenticated Sensitive Information Exposure in 'search' Parameter | CVE-2026-121518 |
- High7.2Unauthenticated Stored Cross-Site Scripting via Comment User-Agent Header
EZ SQL Reports Shortcode Widget and DB Backup
≤5.25.25Update to 5.26.45
- Critical9.8Unauthenticated Arbitrary File Upload via File Upload via Public Form Submission
Chatterbug Forms – Fast, Flexible WordPress Form Builder
≤1.0.2Update to 1.1
- Critical9.8Unauthenticated PHP Object Injection to Remote Code Execution via 'form' Parameter
ELEX WordPress HelpDesk & Customer Ticketing System
≤3.3.9Update to 3.4.0
- Medium5.3Unauthenticated Sensitive Information Exposure in 'search' Parameter
Customer Reviews for WooCommerce
≤5.127.0Update to 5.128.0
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.