Reported vulnerability

Slim SEO <= 4.11.1 - Authenticated (Subscriber+) Arbitrary Shortcode Execution via 'Biographical Info' User Meta

Q: Which versions of Slim SEO – AI SEO Plugin, Lightweight, Fast & Automated are affected?

Wordfence lists these affected versions: Start version unspecified, through 4.11.1. Use the version checker above to compare your installed release with this report.

Q: Is a fix available for Slim SEO – AI SEO Plugin, Lightweight, Fast & Automated?

Wordfence reports a fix for this issue in Slim SEO – AI SEO Plugin, Lightweight, Fast & Automated. It lists these fixed versions: 4.11.2. Back up your website and test the recommended update before applying it to your live site.

Q: Where can I find my installed plugin version?

In WordPress, open Plugins > Installed Plugins and find the version shown beneath the plugin name.

Published 15 Oct 2026

Updated 15 Oct 2026

CVE-2026-104001

Compare your installed software with the affected versions below. Follow the source’s remediation guidance and test an available update after taking a backup. A database entry describes a reported issue; it does not establish whether a particular website has been compromised.

Does this affect my version?

Check your installed version against this advisory. This compares the report’s version ranges and does not scan your website.

Wordfence advisory

medium · CVSS 5.4

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.

Severity vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

Slim SEO – AI SEO Plugin, Lightweight, Fast & Automated

Software: plugin · slim-seo
Affected versions: Start version unspecified, through 4.11.1
Fix availability: Fix available
Fixed versions: 4.11.2

Recommended action

Update to version 4.11.2, or a newer patched version

Further references (1)

wordfence.com/threat-intel/vulnerabilities/id/7a7c53b9-e9b6-4337-9c89-326e66c4bd27

Data sources and licences

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CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE®). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy.

Read licence terms

Source: Wordfence

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Questions about this vulnerability

Which versions of Slim SEO – AI SEO Plugin, Lightweight, Fast & Automated are affected?

Wordfence lists these affected versions: Start version unspecified, through 4.11.1. Use the version checker above to compare your installed release with this report.

Is a fix available for Slim SEO – AI SEO Plugin, Lightweight, Fast & Automated?

Wordfence reports a fix for this issue in Slim SEO – AI SEO Plugin, Lightweight, Fast & Automated. It lists these fixed versions: 4.11.2. Back up your website and test the recommended update before applying it to your live site.

Where can I find my installed plugin version?

In WordPress, open Plugins > Installed Plugins and find the version shown beneath the plugin name.

Does an affected version mean my website has been hacked?

An affected version means the installed release matches a vulnerability described in this report. It does not show whether anyone has exploited it on your website. The checker compares version numbers with stored reports; it does not inspect your website.

These reports cover at least one of the same plugins, themes or WordPress core. Check each report’s affected versions separately.

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