CVE-2025-4369
Companion Auto Update <= 3.9.2 - Authenticated (Administrator+) Stored Cross-Site Scripting via update_delay_days parameter
CVSS Score
5.5
EPSS Score
0.0%
EPSS Percentile
0th
The Companion Auto Update plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the ‘update_delay_days’ parameter in all versions up to, and including, 3.9.2 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with administrator-level access, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. This only affects multi-site installations and installations where unfiltered_html has been disabled.
| CWE | CWE-79 |
| Vendor | papin |
| Product | companion auto update |
| Published | Jul 15, 2025 |
| Last Updated | Apr 8, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:L/A:N Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability
Affected Versions
papin / Companion Auto Update
0 ≤ 3.9.2
References
wordfence.com: https://www.wordfence.com/threat-intel/vulnerabilities/id/b4c61072-5480-43f3-ad9f-ed3f0d577ebc?source=cve wordpress.org: https://wordpress.org/plugins/companion-auto-update/#developers plugins.trac.wordpress.org: https://plugins.trac.wordpress.org/browser/companion-auto-update/tags/3.9.2/admin/dashboard.php#L71 plugins.trac.wordpress.org: https://plugins.trac.wordpress.org/changeset/3325878/
Credits
Nabil Irawan