Code injection in Slim SEO WordPress plugin allows shortcode execution
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Code execution
- Confidentiality · integrity · availability
- Low · Low · None
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-94.
Summary
The Slim SEO AI SEO Plugin for WordPress from rilwis is vulnerable to arbitrary shortcode execution in all versions up to and including 4.11.1. The plugin runs do_shortcode on a value it does not properly validate, which is a code injection flaw (CWE-94). An authenticated attacker with Subscriber-level access can store a shortcode in their own Biographical Info field, and it executes on unauthenticated front-end requests that resolve that author's description.
Written with Claude Haiku 5.5 from the sources below · 2026-10-28
Description from the CNA
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.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
Remediation
The sources list no fixed version for Slim SEO AI SEO Plugin, Lightweight, Fast & Automated.
Written with Claude Haiku 5.5 from the sources below · 2026-10-28
Timeline
- 2026-10-16 Threatist record created from CVE-2026-104001
- 2026-10-16 CISA SSVC decision points changed
- 2026-10-16 Priority changed: MEDIUM → LOW
- 2026-10-16 Alias added: GHSA-6247-9gvr-43xh
References
Other 6
- https://www.wordfence.com/threat-intel/vulnerabilities/id/7a7c53b9-e9b6-4337-9c89-326e66c4bd27?source=cve
- https://plugins.trac.wordpress.org/browser/slim-seo/tags/4.11.0/src/MetaTags/Helper.php#L26
- https://plugins.trac.wordpress.org/browser/slim-seo/tags/4.11.0/src/MetaTags/Data.php#L76
- https://plugins.trac.wordpress.org/browser/slim-seo/tags/4.11.0/src/MetaTags/Helper.php#L168
- https://github.com/elightup/slim-seo/pull/296
- https://plugins.trac.wordpress.org/changeset?reponame=&new=3742833%40slim-seo%2Ftags%2F4.11.2&old=3717070%40slim-seo%2Ftags%2F4.11.0
More rilwis vulnerabilities
- TI-2025-04124 Slim SEO <= 4.5.3 - Authenticated (Contributor+) Stored Cross-Site Scripting via slim_seo_breadcrumbs Shortcode CVSS 3.1MEDIUM 6.4
- TI-2026-10653 Information disclosure in rilwis Slim SEO – A Fast & Automated SEO Plugin For WordPress CVSS 3.1MEDIUM 4.3
Sources
- CVE-2026-104001 · CVE Program
- CVE-2026-104001 · NVD
- FIRST EPSS
- GHSA-6247-9gvr-43xh · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences