Vulnerabilities / Co-Authors Plus / WPSEC-2026-2329
Co-Authors Plus <= 4.1.3 - Authenticated (Contributor+) Stored Cross-Site Scripting via Byline Template Tags
Medium 6.4
CWE-79Fixed in 4.2.0
- ID
- WPSEC-2026-2329
- Plugin
- Co-Authors Plus (co-authors-plus)
- Affected
- all versions before 4.2.0
- Remediation
- Update to 4.2.0 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, 2026-11-03
- Attack surface
- Co-Authors Plus on WPSec AttackSurface
- Fix released
- Published
Description
The Co-Authors Plus plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the plain byline template tags (such as coauthors()) in all versions up to, and including, 4.1.3 due to insufficient output escaping of co-author field values, tag values and the user_login fallback in coauthors__echo(). This makes it possible for authenticated attackers, with contributor-level access and above, who can write raw guest author profile meta such as the display name, to inject arbitrary web scripts in pages that will execute whenever a user accesses a page displaying the byline.
References
- https://wpsec.com/vuln/WPSEC-2026-2329/
- https://plugins.svn.wordpress.org/co-authors-plus/tags/4.2.0/
- https://wordpress.org/plugins/co-authors-plus/
Published by WPSec. Provided as is, without warranty. Corrections: contact us.
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