CVE-2026-105829

League CommonMark 1.3.0 before 2.10.2 Stored XSS via DisallowedRawHtml Bypass

MEDIUM 5.3

En bref

Source: NVD
EPSS: EPSS 0.25 % · centile 16 (2026-10-28)
État: PUBLISHED
Publiée: 2026-10-08 14:10 UTC
Mise à jour: 2026-10-10 03:05 UTC
Attribuée par: VulnCheck
Statut NVD: Awaiting Analysis

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.

Faiblesses (CWE)

CWE-80 — Improper Neutralization of Script-Related HTML Tags in a Web Page

Références

Scores

Version	Score	Vecteur	Évalué par
CVSS 4.0	MEDIUM 5.3	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N	VulnCheck
CVSS 3.1	MEDIUM 6.1	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N	VulnCheck
CVSS 4.0	MEDIUM 5.3	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X	NVD · disclosure@vulncheck.com (Secondary)
CVSS 3.1	MEDIUM 6.1	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N	NVD · disclosure@vulncheck.com (Secondary)

Avis

GHSA-97jj-33gv-5xf9 — league/commonmark: DisallowedRawHtml bypassed when a disallowed tag name ends the raw-HTML literal

Références européennes

ENISA EUVD · EUVD-2026-95016
GCVE · GCVE-0-2026-105829

Produits affectés

Produit	Versions
thephpleague · commonmark

Sources

Source	Licence
CVE List (CVEProject cvelistV5)	CVE Program Terms of Use
EPSS (FIRST.org)	FIRST — attribution requested
ENISA EUVD	ENISA — reproduction authorised, source acknowledged
NVD (NIST) via fkie-cad/nvd-json-data-feeds	Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD