Slim SEO <= 4.11.1 — Authenticated (Subscriber+) Arbitrary Shortcode Execution via 'Biographical Info' User Meta
CVE-2026-104001Published · Updated Action summary
Affected: ≤4.11.1Update to 4.11.2 or newer
All remediation steps- Severity
- Medium5.4
- CVSS
- 5.4CVSS 3.1 · CNA (Wordfence)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/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:LConfidentiality- Low
I:LIntegrity- Low
A:NAvailability- None
- Required access
- Unknown
- Exploit prediction (EPSS)
- 0.2% chance in 30 days13th percentile
- CISA KEV
- Not listed
On this page8
Am I affected?
Slim SEO – AI SEO Plugin, Lightweight, Fast & Automated slim-seo
- Affected≤ 4.11.1
- Patched in4.11.2
Update to 4.11.2 or newer.
You are affected if you run ≤ 4.11.1. Version 4.11.2 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 4.11.2, 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 Kuba.
The The Slim SEO – AI SEO Plugin, Lightweight, Fast & Automated plugin for WordPress is vulnerable to arbitrary shortcode execution in all versions up to, and including, 4.11.1 This is due to the software allowing users to execute an action that does not properly validate a value before running do_shortcode. This makes it possible for authenticated attackers, with subscriber-level access and above, to execute arbitrary shortcodes. A Subscriber-level user need only save the shortcode payload to their own Biographical Info field via the REST API or wp-admin profile page; the shortcode then executes on any unauthenticated front-end request that resolves that author's description, such as requests using the ?author= query parameter when auto_redirection is disabled.
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 |
|---|---|---|---|
| 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 | 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 |
- 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
- Medium4.3Authenticated (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 5.4
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.
- EPSS
- Exploit Prediction Scoring System by FIRST.org.
- VulnCrest content
- Summary, remediation guidance and page layout © VulnCrest. Not sourced from NVD.