CVE-2026-126800 Hydro @hydrooj/ui-default before 4.59.1 Stored XSS via Markdown language- Class
CriticalCVSS 9.3
- Published
- Updated
- Exploit status
- No public exploit known
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
| Product | Affected versions | Fixed in |
|---|---|---|
| hydrooj @hydrooj/ui-default | < 4.59.1 | 4.59.1 |
References
- github.com patch
- github.com technical-description
- vul.yulun.ac.cn third-party-advisory
- VulnCheck Advisory: Hydro @hydrooj/ui-default before 4.59.1 Stored XSS via Markdown language- Class third-party-advisory