What’s Vulnerable › Vulnerabilities

CVE-2025-4369: Companion Auto Update <= 3.9.2 - Authenticated (Administrator+) Stored Cross-Site Scripting via update_delay_days parameter

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-07-15 · updated 2026-06-17
• Weakness: CWE-79

Description

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.

Affected products

• papin Companion Auto Update: through 3.9.2

References

• https://plugins.trac.wordpress.org/browser/companion-auto-update/tags/3.9.2/admin/dashboard.php#L71
• https://plugins.trac.wordpress.org/changeset/3325878/
• https://wordpress.org/plugins/companion-auto-update/#developers
• https://www.wordfence.com/threat-intel/vulnerabilities/id/b4c61072-5480-43f3-ad9f-ed3f0d577ebc?source=cve

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