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CVE-2026-105829 Details

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.

Metrics

CVSS 3.x Severity and Vector Strings:

CNA: [email protected]CVSS-B:6.1 MEDIUMVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://github.com/thephpleague/commonmark/security/advisories/GHSA-97jj-33gv-5xf9	CISA-ADP
https://github.com/thephpleague/commonmark/security/advisories/GHSA-97jj-33gv-5xf9	[email protected]
https://www.vulncheck.com/advisories/league-commonmark-1.3.0-before-2.10.2-stored-xss-via-disallowedrawhtml-bypass	[email protected]

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-80	Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)	[email protected]

Affected Products

No affected product data is available for this CVE.

Change History

3 change records found show changes

Date	Action	Recorded By
Oct 10, 2026	CVE Modified	CISA-ADP
Oct 8, 2026	CVE Modified	[email protected]
Oct 8, 2026	New CVE Received	[email protected]