GenerateBlocks <= 2.5.0 - Authenticated (Contributor+) Stored Cross-Site Scripting via Dynamic Tag Editor Preview
- ID
- WPSEC-2026-2914
- Plugin
- GenerateBlocks (generateblocks)
- Affected
- from 2.0.0 before 2.5.1
- Remediation
- Update to 2.5.1 or later.
- CVSS 3.1
- CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
- Weakness
- CWE-79
- Usage
- Plugin Low · Affected versions Low among sites WPSec scans, 2026-11-12
- Attack surface
- GenerateBlocks on WPSec AttackSurface
- Fix released
- Published
Description
The GenerateBlocks plugin for WordPress is vulnerable to Stored Cross-Site Scripting via dynamic tag previews in the block editor in all versions up to, and including, 2.5.0. This is due to insufficient sanitization of preview replacements. Server-side sanitization was skipped whenever the viewing user had the unfiltered_html capability, and the text block preview inserted raw replacement values into HTML, including attributes such as event handlers. This makes it possible for authenticated attackers, with contributor-level access and above, to plant dynamic tags (for example a 'replace' modifier carrying an event handler payload) that execute arbitrary web scripts when an administrator opens or previews the post in the editor.
References
- https://wpsec.com/vuln/WPSEC-2026-2914/
- https://plugins.svn.wordpress.org/generateblocks/tags/2.5.1/
- https://wordpress.org/plugins/generateblocks/
Published by WPSec. Provided as is, without warranty. Corrections: contact us.
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