league/commonmark: DisallowedRawHtml extension bypass via whitespace in HTML tag names
Résumé
league/commonmark: DisallowedRawHtml extension bypass via whitespace in HTML tag names
Description d'origine
La description telle que publiée par la source (souvent en anglais).
league/commonmark is a PHP Markdown parser. Prior to version 2.8.1, the DisallowedRawHtml extension can be bypassed by inserting a newline, tab, or other ASCII whitespace character between a disallowed HTML tag name and the closing >. For example, would pass through unfiltered and be rendered as a valid HTML tag by browsers. This is a cross-site scripting (XSS) vector for any application that relies on this extension to sanitize untrusted user input. All applications using the DisallowedRawHtml extension to process untrusted markdown are affected. Applications that use a dedicated HTML sanitizer (such as HTML Purifier) on the rendered output are not affected. This issue has been patched in version 2.8.1.
Source: OSV.dev (Open Source Vulnerabilities) NVD GitHub Advisory OSV
État des correctifs par distribution
Paquets corrigés publiés par chaque distribution pour cette CVE
- Debian DEBIAN-CVE-2026-30838 php-league-commonmark
- Ubuntu UBUNTU-CVE-2026-30838 php-league-commonmark Corrigé dans: 1.3.1-1ubuntu2+esm1
Références
- advisory github.com
- advisory github.com
- advisory nvd.nist.gov