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Companion Auto Update vulnerabilities
Companion Auto Update has 3 known vulnerabilities in this database. The most recent published record is dated 15 Jul 2025.
- Known vulnerabilities
- 3
- Active installs
- 40,000+
- Latest version
- 3.9.4
- Last updated
- 21 Mar 2026
- Most recent
- 15 Jul 2025
Find it in your WordPress dashboard under Plugins. Severity is based on the CVSS score published with the CVE where one is available.
| Vulnerability | Severity | Affected | Fix | Published |
|---|---|---|---|---|
| Cross-site scripting (XSS) CVE-2025-4369 | Medium 5.5 | Up to 3.9.2 | Fixed in a later version (latest 3.9.4) | 15 Jul 2025 |
| Cross-site request forgery (CSRF) CVE-2018-20972 | High 8.8 | Before 3.2.1 | Fixed in 3.2.1 | 16 Aug 2019 |
| File inclusion CVE-2018-20973 | Critical 9.8 | Before 3.2.1 | Fixed in 3.2.1 | 16 Aug 2019 |
Read the published descriptions
- CVE-2025-4369, 15 Jul 2025
- 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. CVE record
- CVE-2018-20972, 16 Aug 2019
- The companion-auto-update plugin before 3.2.1 for WordPress has CSRF. CVE record
- CVE-2018-20973, 16 Aug 2019
- The companion-auto-update plugin before 3.2.1 for WordPress has local file inclusion. CVE record
What to do if you run Companion Auto Update
If you run Companion Auto Update, open WordPress and check the installed version in Plugins. Compare it with the affected versions in the vulnerability record. If a fixed version is available, take a current backup and update to that version or the latest supported release.
If no fixed version exists, consider disabling and removing the plugin or replacing it with a maintained alternative. After dealing with the affected software, check administrator users, unexpected file changes, redirects, unfamiliar pages and security logs for signs that the site may already have been altered.
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