{"id":"CVE-2026-105829","title":"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","summary":"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…","severity":"medium","cvss":6.1,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","cwe":["CWE-80"],"vendor":"thephpleague","product":"commonmark","affected":["commonmark"],"published":"2026-10-08","updated":"2026-10-10","sourceUpdated":"2026-10-10T04:18:09.177","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-105829","references":[{"url":"https://github.com/thephpleague/commonmark/security/advisories/GHSA-97jj-33gv-5xf9","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/league-commonmark-1.3.0-before-2.10.2-stored-xss-via-disallowedrawhtml-bypass","label":"disclosure@vulncheck.com"},{"url":"https://github.com/thephpleague/commonmark/security/advisories/GHSA-97jj-33gv-5xf9","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"tags":["nvd","cve.org","exploit-available"],"epss":0.0025,"epssPercentile":0.16239,"ingestedAt":"2026-10-08T14:47:16.360Z","exploitAvailable":true,"ssvc":{"exploitation":"poc","automatable":"no","technicalImpact":"partial","timestamp":"2026-10-10T03:05:16.269227Z"},"slug":"CVE-2026-105829","body":"## Overview\n\nLeague 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":46,"depthScoreParts":{"impact":33.6,"likelihood":0.1,"exploitation":12,"ransomware":0},"changes":[{"seq":220689,"id":"CVE-2026-105829","ts":1792026569446,"field":"exploit_available","old":"false","new":"true"}]}