{"id":"CVE-2026-126569","summary":"Mbin 1.2.1 before 1.11.1 Stored XSS via Markdown Image Nested in Link","details":"Mbin 1.2.1 before 1.11.1 contains a stored cross-site scripting vulnerability in EmbedElement::buildDestructed() that renders nested Markdown image alt text and URL without HTML escaping. Authenticated users can embed HTML in the alt text of an image inside a link in entries, comments, posts, messages, or bios to run script in viewers' browsers.","aliases":["GHSA-g3r9-j6w4-2257"],"modified":"2026-11-12T10:45:27.375236415Z","published":"2026-11-11T02:36:05.461Z","database_specific":{"cwe_ids":["CWE-79"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/126xxx/CVE-2026-126569.json","unresolved_ranges":[{"extracted_events":[{"strategy":"StandardRange","range":[{"introduced":"1.2.1"},{"fixed":"1.11.1"}],"source":"AFFECTED_FIELD"}]},{"extracted_events":[{"range":[{"introduced":"1.2.1"},{"fixed":"1.11.1"}],"source":"DESCRIPTION"}]}],"cna_assigner":"VulnCheck"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/126xxx/CVE-2026-126569.json"},{"type":"ADVISORY","url":"https://github.com/MbinOrg/mbin/releases/tag/v1.11.1"},{"type":"ADVISORY","url":"https://github.com/MbinOrg/mbin/security/advisories/GHSA-g3r9-j6w4-2257"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-126569"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/mbin-1.2.1-before-1.11.1-stored-xss-via-markdown-image-nested-in-link"},{"type":"FIX","url":"https://github.com/MbinOrg/mbin/commit/736fd39fe9cd59f5d51636d25e1857d88ddbd0bd"},{"type":"PACKAGE","url":"https://github.com/MbinOrg/mbin"},{"type":"ARTICLE","url":"https://github.com/MbinOrg/mbin/blob/v1.11.0/src/Markdown/CommonMark/EmbedElement.php#L57-L67"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/mbinorg/mbin","events":[{"introduced":"0"},{"fixed":"736fd39fe9cd59f5d51636d25e1857d88ddbd0bd"},{"fixed":"6d04519c09ce4b42acf791359e770c7fff5d4840"}],"database_specific":{"extracted_events":[{"range":[{"fixed":"736fd39fe9cd59f5d51636d25e1857d88ddbd0bd"}],"source":"REFERENCES_COMMIT"},{"range":[{"fixed":"6d04519c09ce4b42acf791359e770c7fff5d4840"}],"source":"REFERENCES_TAG","original_tag":"v1.11.1"}]}}],"versions":["v1.11.0","v1.10.0","v1.10.0-rc2","v1.10.0-rc1","v1.9.1","v1.9.0","v1.9.0-rc3","v1.9.0-rc2","v1.9.0-rc1","v1.8.4","v1.8.3","v1.8.3-rc1","v1.8.2","v1.8.1","v1.8.0","v1.7.4","v1.7.3","v1.7.2","v1.7.1","v1.7.1-rc5","v1.7.1-rc4","v1.7.1-rc3","v1.7.1-rc2","v1.7.1-rc1","v1.7.0","v1.7.0-rc2","v1.7.0-rc1","v1.6.0","v1.5.2","v1.5.1","v1.5.0","v1.4.1","v1.4.0","v1.3.0","v1.2.1","v1.2.0","v1.1.0","v1.0.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-126569.json"}}],"schema_version":"1.9.2","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N"}]}