Arbitrary Shortcode Execution in Slim SEO Plugin for WordPress
CVE-2026-104001

5.4MEDIUM

Key Information:

Vendor

WordPress
Status
Slim Seo – Ai Seo Plugin, Lightweight, Fast & Automated
Vendor
CVE Published:
16 October 2026

What is CVE-2026-104001?

The Slim SEO Plugin for WordPress is susceptible to arbitrary shortcode execution, affecting all versions up to 4.11.1. This vulnerability arises from inadequate validation of user input when processing shortcodes. Authenticated attackers with at least subscriber-level access can exploit this vulnerability by inserting malicious shortcode payloads into their Biographical Info field, which subsequently executes on the front end when their author description is requested. This significantly compromises the security of WordPress sites using this plugin, allowing unauthorized script execution through seemingly benign actions.

Affected Version(s)

Slim SEO – AI SEO Plugin, Lightweight, Fast & Automated 0 <= 4.11.1

References

https://www.wordfence.com/threat-intel/vulnerabilities/id...
https://plugins.trac.wordpress.org/browser/slim-seo/tags/...
https://plugins.trac.wordpress.org/browser/slim-seo/tags/...

CVSS V3.1

Score:
5.4
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Kuba
.