CVE-2026-105829
MEDIUM
NVD
CVSS Score
6.1
Severity
MEDIUM
Published
Oct 08, 2026
Vendor
unknown
Description
League CommonMark from 1.3.0 before 2.10.2 contains a cross-site scripting vulnerability that allows users posting Markdown to bypass the DisallowedRawHtml extension by ending raw HTML with a bare disallowed tag name. Attackers can place a lone <script or <iframe line followed by a block supplying attributes like src or onload, executing stored scripts in viewers' browsers under default GFM settings.