Blocksy Companion <= 2.1.57 - Authenticated (Contributor+) Stored Cross-Site Scripting via Breadcrumbs Block Attributes
- ID
- WPSEC-2026-0351
- Plugin
- Blocksy Companion (blocksy-companion)
- Affected
- from 2.0.49 before 2.1.58
- Remediation
- Update to 2.1.58 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 Medium · Affected versions Medium among sites WPSec scans, 2026-10-22
- Attack surface
- Blocksy Companion on WPSec AttackSurface
- Fix released
- Published
Description
The Blocksy Companion plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the Breadcrumbs block's attributes (className, link/text/hover color slugs, custom color values and style.color entries) in versions 2.0.49 up to, and including, 2.1.57 due to insufficient input sanitization, combined with the Blocksy theme (up to 2.1.57) outputting these values into the breadcrumbs wrapper's class and style attributes without escaping. 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-2026-0351/
- https://plugins.svn.wordpress.org/blocksy-companion/tags/2.1.58/
- https://wordpress.org/plugins/blocksy-companion/
Published by WPSec. Provided as is, without warranty. Corrections: contact us.
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