CVE-2026-61453
CVE-2026-61453 · Grav before 2.0.1 XSS via Twig String Concatenation
This page contains facts from public vulnerability sources. Check the original advisory before updating.
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 <img src=1 onerror=alert(1)>, executing arbitrary JavaScript in visitors' browsers.
CVSS 5.1 · Medium · EPSS 0.2% · Fix available
- Published
- Updated
Stack: php
Affected products and versions
grav
- Versions
- ≥ 0, < 2.0.1: Affected (semver)
- 2.0.1: Not affected (semver)
Update to 2.0.1
getgrav/grav Packagist
- Versions
- 2.0.0
- Affected ranges
- ECOSYSTEM: ≥ 2.0.0, < 2.0.1
Update to 2.0.1