CVE-2026-75834: Getgrav Grav

Medium severity, CVSS 5.4. EPSS: 0.3% chance of exploitation in the next 30 days.

Grav before 2.0.14 contains a stored cross-site scripting vulnerability in the Security::detectXss() function (system/src/Grav/Common/Security.php). All XSS detection patterns use the PCRE /u (UTF-8) modifier, so a single invalid UTF-8 byte anywhere in page content causes preg_match() to return false for every pattern, silently bypassing the save-time XSS safety gate (Validation::checkSafety()). An authenticated attacker with page-edit permissions (without the security.xss_whitelist privilege) can store malicious JavaScript that executes in the browser of a visitor who views the affected page.

Affected products

• Getgrav Grav: before 2.0.14 (fixed in 2.0.14)

Published 2026-08-18. Last modified 2026-10-08.