High severity8.7NVD Advisory· Published Nov 11, 2026
CVE-2026-126800
CVE-2026-126800
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.
Affected products
2Patches
Vulnerability mechanics
References
4- github.com/hydro-dev/Hydro/blob/3c8286dd1350fcd00412e95d5b056dbfed64edda/packages/ui-default/backendlib/markdown-it-xss.tsnvd
- github.com/hydro-dev/Hydro/commit/3bae56fe8edddff12346bcb1c8281269c94688d8nvd
- vul.yulun.ac.cn/20261107/hydro/nvd
- www.vulncheck.com/advisories/hydro-hydrooj-ui-default-before-4.59.1-stored-xss-via-markdown-language-classnvd
News mentions
0No linked articles in our index yet.