Cross-site scripting in Grav CMS - CVE-2025-66309

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Main Vulnerability Database Vulnerabilities #VU130061

Cross-site scripting in Grav CMS - CVE-2025-66309

Published: May 5, 2026


Vulnerability identifier: #VU130061
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:U/U:Clear
CVE-ID: CVE-2025-66309
CWE-ID: CWE-79
Exploitation vector: Remote access
Exploit availability: No public exploit available
Vendor: Grav CMS
Affected software:
Grav CMS

Detailed vulnerability description

The vulnerability allows a remote user to execute arbitrary script in the victim's browser.

The vulnerability exists due to cross-site scripting in the /admin/pages/[page] endpoint when handling the data[header][content][items] parameter. A remote privileged user can craft a malicious URL with a script payload to execute arbitrary script in the victim's browser.

User interaction is required when the crafted URL is accessed.


How to mitigate CVE-2025-66309

Install security update from vendor's website.

Sources