PT-2026-94131

Summary The XSS blueprint validator Security::detectXss runs on the raw page content before Twig processing. An attacker can use Twig's string concatenation operator to dynamically construct an event handler name at render time. The validator sees "on" "error" - a harmless Twig expression - and...

EUVD-2026-62548

Grav Shortcode Core Plugin allows for the development shortcode plugins that utilize the common format utilized by WordPress and BBCode. Prior to 6.2.2, Grav Shortcode Core passes shortcode syntax through Security::detectXss because it contains no literal less-than character, then...

CVE-2026-64851

In Grav Shortcode Core Plugin before 6.2.2, ColorShortcode.php and related attribute handlers concatenate attacker-controlled parameters into HTML without encoding, bypassing Security::detectXss() (which misses payloads without a literal

CVE-2026-64851 Grav Shortcode Core Plugin: Stored XSS in shortcode-core attribute handlers

Grav Shortcode Core Plugin allows for the development shortcode plugins that utilize the common format utilized by WordPress and BBCode. Prior to 6.2.2, Grav Shortcode Core passes shortcode syntax through Security::detectXss because it contains no literal less-than character, then...

CVE-2026-64851: Improper Neutralization of Input During Web Page Generation

Grav Shortcode Core Plugin allows for the development shortcode plugins that utilize the common format utilized by WordPress and BBCode. Prior to 6.2.2, Grav Shortcode Core passes shortcode syntax through Security::detectXss because it contains no literal less-than character, then...

CVE-2026-75834 Grav before 2.0.14 Stored XSS via Invalid UTF-8 Byte

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 pregmatch to return false for...

CVE-2026-75834

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 pregmatch to return false for...

CVE-2026-75834 Grav before 2.0.14 Stored XSS via Invalid UTF-8 Byte

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 pregmatch to return false for...

PT-2026-76934

Name of the Vulnerable Software and Affected Versions Grav versions prior to 2.0.14 Description A stored cross-site scripting issue exists in the Security::detectXss function located in system/src/Grav/Common/Security.php. The XSS detection patterns utilize the PCRE /u UTF-8 modifier, which cause...

CVE-2026-75834: Improper Neutralization of Input During Web Page Generation

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 pregmatch to return false for...

CVE-2026-72832

Grav versions from 1.5.2 through 2.0.12 contain a stored cross-site scripting vulnerability in the Security::detectXss function system/src/Grav/Common/Security.php. The event-handler scan is anchored at ?, which cannot cross the first literal ; when a appears inside a quoted attribute value the...

CVE-2026-72832

Grav versions from 1.5.2 through 2.0.12 contain a stored cross-site scripting vulnerability in the Security::detectXss function system/src/Grav/Common/Security.php. The event-handler scan is anchored at ?, which cannot cross the first literal ; when a appears inside a quoted attribute value the...

CVE-2026-72832

Grav before 2.0.13 (versions 1.5.2–2.0.12) contains a stored XSS in Security::detectXss() (system/src/Grav/Common/Security.php). The event-handler detector uses a pattern anchored at “]*?, which fails when a > appears inside a quoted attribute value, allowing a payload such as ” onerror=alert(...

PT-2026-72001

Name of the Vulnerable Software and Affected Versions Grav versions 1.5.2 through 2.0.12 Description A stored cross-site scripting issue exists in the Security::detectXss function located in system/src/Grav/Common/Security.php. The event-handler scan uses a regular expression that fails to accoun...

CVE-2026-72832: Improper Neutralization of Input During Web Page Generation

Grav versions from 1.5.2 through 2.0.12 contain a stored cross-site scripting vulnerability in the Security::detectXss function system/src/Grav/Common/Security.php. The event-handler scan is anchored at ?, which cannot cross the first literal ; when a appears inside a quoted attribute value the...

GHSA-373M-P57P-8665 Duplicate Advisory: Grav: XSS Blueprint Validation Bypass via Twig String Concatenation

Duplicate Advisory This advisory has been withdrawn because it is a duplicate of GHSA-2c4f-86xc-cr74. This link is maintained to preserve external references. Original Description Grav v2.0.0 contains a cross-site scripting vulnerability fixed in 2.0.1. The XSS blueprint validator...

CVE-2026-61453: Improper Neutralization of Input During Web Page Generation

Grav v2.0.0 contains a cross-site scripting vulnerability fixed in 2.0.1. The XSS blueprint validator Security::detectXss runs on raw page content before Twig processing. When Twig content processing is enabled twigcontent.processenabled: true, an attacker with page-write API permission can use...