Co-Authors Plus <= 4.1.2 - Authenticated (Contributor+) Missing Authorization to Post Co-Author Modification via REST API and tax_input
- ID
- WPSEC-2026-1746
- Plugin
- Co-Authors Plus (co-authors-plus)
- Affected
- all versions before 4.1.3
- Remediation
- Update to 4.1.3 or later.
- CVSS 3.1
- CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
- Weakness
- CWE-862
- Usage
- Plugin Medium · Affected versions Medium among sites WPSec scans, 2026-10-27
- Attack surface
- Co-Authors Plus on WPSec AttackSurface
- Fix released
- Published
Description
The Co-Authors Plus plugin for WordPress is vulnerable to unauthorized modification of data via the REST API 'coauthors' parameter and the 'tax_input' post field in all versions up to, and including, 4.1.2, due to the author taxonomy using WordPress's default assign_terms capability (edit_posts) instead of the plugin's set-authors check (edit_others_posts by default). This makes it possible for authenticated attackers with Contributor-level access and above, who are not permitted to set authors, to change or clear the co-authors (bylines) of posts they can edit, for example crediting their own posts to other users.
References
- https://wpsec.com/vuln/WPSEC-2026-1746/
- https://plugins.svn.wordpress.org/co-authors-plus/tags/4.1.3/
- https://wordpress.org/plugins/co-authors-plus/
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