MPG <= 4.2.4 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'base-url' Shortcode Attribute
- ID
- WPSEC-2026-0860
- Plugin
- MPG – Multiple Page Generator, Bulk Landing Pages & Programmatic SEO (multiple-pages-generator-by-porthas)
- Affected
- all versions before 4.2.5
- Remediation
- Update to 4.2.5 or later.
- CVSS 3.1
- CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
- Weakness
- CWE-79
- Usage
- Plugin Low · Affected versions None seen among sites WPSec scans, 2026-10-13
- Attack surface
- MPG on WPSec AttackSurface
- Fix released
- Published
Description
The MPG – Multiple Page Generator, Bulk Landing Pages & Programmatic SEO plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'base-url' attribute of the plugin's [mpg] and [mpg_match] shortcodes in all versions up to, and including, 4.2.4, due to insufficient input sanitization and output escaping. The attribute is HTML-entity-decoded and then put, without escaping, in front of each generated page URL that replaces the {{mpg_url}} placeholder in the shortcode's rendered content. This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.
References
- https://wpsec.com/vuln/WPSEC-2026-0860/
- https://plugins.svn.wordpress.org/multiple-pages-generator-by-porthas/tags/4.2.5/
- https://wordpress.org/plugins/multiple-pages-generator-by-porthas/
Published by WPSec. Provided as is, without warranty. Corrections: contact us.
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