{"affected":[{"defaultStatus":"unaffected","ecosystem":"npm","packageName":"%40hydrooj/ui-default","product":"@hydrooj/ui-default","source":"CNA: VulnCheck","vendor":"hydro-dev","versions":[{"lessThan":"4.59.1","status":"affected","version":"0","versionType":"semver"}]}],"cveId":"CVE-2026-126800","cwes":["CWE-79"],"description":"Hydro @hydrooj/ui-default before 4.59.1 contains a stored cross-site scripting vulnerability that allows registered users to inject script by placing double quotes in language- class tokens within markdown-it-xss.ts. Attackers can store a payload in their profile bio that executes when administrators or other users view it, stealing the non-httpOnly sid session cookie for session hijacking.","epss":null,"exploits":[],"kev":null,"metrics":[{"score":9.3,"severity":"critical","source":"CNA: VulnCheck","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N","version":"4.0"},{"score":8.7,"severity":"high","source":"CNA: VulnCheck","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N","version":"3.1"},{"score":9.3,"severity":"critical","source":"NVD: disclosure@vulncheck.com","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:H/VA:N/SC:H/SI:H/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","version":"4.0"},{"score":8.7,"severity":"high","source":"NVD: disclosure@vulncheck.com","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N","version":"3.1"}],"modifiedAt":1794512611934,"publishedAt":1794430384583,"references":[{"source":"CNA: VulnCheck","tags":["patch"],"url":"https://github.com/hydro-dev/Hydro/commit/3bae56fe8edddff12346bcb1c8281269c94688d8"},{"source":"CNA: VulnCheck","tags":["technical-description"],"url":"https://github.com/hydro-dev/Hydro/blob/3c8286dd1350fcd00412e95d5b056dbfed64edda/packages/ui-default/backendlib/markdown-it-xss.ts#L150-L157"},{"source":"CNA: VulnCheck","tags":["third-party-advisory"],"url":"https://vul.yulun.ac.cn/20261107/hydro/"},{"source":"CNA: VulnCheck","tags":["third-party-advisory"],"url":"https://www.vulncheck.com/advisories/hydro-hydrooj-ui-default-before-4.59.1-stored-xss-via-markdown-language-class"},{"source":"disclosure@vulncheck.com","tags":[],"url":"https://github.com/hydro-dev/Hydro/blob/3c8286dd1350fcd00412e95d5b056dbfed64edda/packages/ui-default/backendlib/markdown-it-xss.ts#L150-L157"},{"source":"disclosure@vulncheck.com","tags":[],"url":"https://github.com/hydro-dev/Hydro/commit/3bae56fe8edddff12346bcb1c8281269c94688d8"},{"source":"disclosure@vulncheck.com","tags":[],"url":"https://vul.yulun.ac.cn/20261107/hydro/"},{"source":"disclosure@vulncheck.com","tags":[],"url":"https://www.vulncheck.com/advisories/hydro-hydrooj-ui-default-before-4.59.1-stored-xss-via-markdown-language-class"}],"remediation":[{"kind":"fix","source":"CNA: VulnCheck","text":"The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.","url":"https://github.com/hydro-dev/Hydro/commit/3bae56fe8edddff12346bcb1c8281269c94688d8"}],"revision":"7bdb876545f0ed7041f009e59a801848ffba6dca4f93547854e31eee2bf5dbbc","sources":[{"modifiedAt":1794512611934,"name":"CNA: VulnCheck","retrievedAt":1794514238798,"url":"https://www.cve.org/CVERecord?id=CVE-2026-126800"},{"modifiedAt":1794431803507,"name":"NVD","retrievedAt":1794443545254,"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-126800"}],"ssvc":{"assessedAt":1794512602451,"automatable":"no","exploitation":"none","source":"ADP: CISA-ADP","technicalImpact":"total"},"status":"published","title":"Hydro @hydrooj/ui-default before 4.59.1 Stored XSS via Markdown language- Class","updatedAt":1794514238798}