CVE-2026-61453

CVE-2026-61453 · Grav before 2.0.1 XSS via Twig String Concatenation

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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 · Moyenne · EPSS 0,2% · Correctif disponible

Publication

2026-07-15T11:25:45.830Z

Mise à jour

2026-10-08T15:23:35.720Z

Pile logicielle: php

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