{"id":"CVE-2025-4369","aliases":["EUVD-2025-21421","GHSA-99ch-c9wr-h7qc"],"status":"published","title":"Companion Auto Update \u003c= 3.9.2 - Authenticated (Administrator+) Stored Cross-Site Scripting via update_delay_days parameter","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.","severity":{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:L/A:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.00286,"percentile":0.2128,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-79"],"published":"2025-07-15T09:22:51Z","modified":"2026-06-17T09:33:07Z","products":[{"vendor":"papin","product":"companion auto update"}],"references":[{"url":"https://www.wordfence.com/threat-intel/vulnerabilities/id/b4c61072-5480-43f3-ad9f-ed3f0d577ebc?source=cve"},{"url":"https://wordpress.org/plugins/companion-auto-update/#developers"},{"url":"https://plugins.trac.wordpress.org/browser/companion-auto-update/tags/3.9.2/admin/dashboard.php#L71"},{"url":"https://plugins.trac.wordpress.org/changeset/3325878/"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2025-4369"},{"url":"https://plugins.trac.wordpress.org/changeset/3325878"},{"url":"https://github.com/advisories/GHSA-99ch-c9wr-h7qc"}],"sources":{"cve":[{"id":"CVE-2025-4369","title":"Companion Auto Update \u003c= 3.9.2 - Authenticated (Administrator+) Stored Cross-Site Scripting via update_delay_days parameter","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.","status":"published","published":"2025-07-15T09:22:51.602Z","modified":"2026-04-08T17:17:04.286Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:L/A:N","level":"medium","assessor":"cna"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:32:48.167635Z"}],"euvd":[{"id":"EUVD-2025-21421","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.","status":"published","published":"2025-07-15T09:22:51Z","modified":"2026-04-08T17:17:04Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T19:24:44.170067Z"}],"ghsa":[{"id":"GHSA-99ch-c9wr-h7qc","title":"The Companion Auto Update plugin for WordPress is vulnerable to Stored Cross-Site Scripting via...","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.","status":"published","published":"2025-07-15T12:30:26Z","modified":"2025-07-15T12:30:31Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:L/A:N","level":"medium"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T15:03:01.086006Z"}],"nvd":[{"id":"CVE-2025-4369","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.","status":"published","published":"2025-07-15T10:15:22.957Z","modified":"2026-06-17T09:33:07.75Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:L/A:N","level":"medium","assessor":"secondary"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:11:18.285862Z"}]}}