Is CVE-2026-105829 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-105829?

CVE-2026-105829 has a CVSS v3 severity of MEDIUM (6.1).

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CVE-2026-105829

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.