PT-2026-60147 · Getgrav · Grav

Alienkeric + 1 · Published 2026-07-15 · Updated 2026-07-15 · CVE-2026-61453

NVD

CVSS v3.1

6.1

Medium

Base vector

AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

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 (twig content.process enabled: true), an attacker with page-write API permission can use Twig's string concatenation operator (~) to dynamically construct event handler names, dangerous tag names, or dangerous protocols at render time (e.g. {% set x = "on" ~ "error" %}). The validator sees only the harmless Twig expression and allows the content, but after Twig rendering the output (rendered via {{ page.content|raw }}) contains an active payload such as , executing arbitrary JavaScript in visitors' browsers.

Fix

XSS

Weakness Enumeration

CWE-79

Related Identifiers

CVE-2026-61453

Affected Products

Grav

References · 3

• https://github.com/getgrav/grav/security/advisories/GHSA-2c4f-86xc-cr74 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-61453 · Security Note
• https://vulncheck.com/advisories/grav-before-xss-via-twig-string-concatenation · Note