Cross-site scripting in Grav CMS - CVE-2026-42612
Published: May 5, 2026
Vulnerability identifier: #VU130078
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-42612
CWE-ID: CWE-79
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Grav CMS
Affected software:
Grav CMS
Grav CMS
Detailed vulnerability description
The vulnerability allows a remote user to execute arbitrary JavaScript in a victim's browser.
The vulnerability exists due to improper neutralization of input during web page generation in the detectXss() function when handling unquoted HTML event attributes in content fields. A remote user can inject crafted HTML with unquoted event handler attributes to execute arbitrary JavaScript in a victim's browser.
Any user, including administrators, who views the compromised published content can be affected.
How to mitigate CVE-2026-42612
Install security update from vendor's website.