Vulnerability Description
TS3 Manager is modern web interface for maintaining Teamspeak3 servers. Prior to 2.2.6, the /api/download handler in packages/server/routes/api.js passes the attacker-controlled port query parameter to socket.connect(port, host) and returns the resulting error.message through res.status(400).send(error.message) as text/html without a Content Security Policy. When a logged-in operator follows a crafted top-level link, the reflected value executes in the manager origin. The token cookie set in packages/ui/src/store/modules/query.js lacks HttpOnly, Secure, and an explicit SameSite attribute, allowing the script to read the token and call the autofillform event in packages/server/socket.js. autofillform returns the decoded JWT, including the cleartext ServerQuery password, enabling operator-session hijacking and control of the managed TeamSpeak server when the operator uses administrative ServerQuery credentials. A valid operator session and user interaction are required. This issue is fixed in 2.2.6.
CVSS Score
HIGH
Related Weaknesses (CWE)
References
- https://github.com/joni1802/ts3-manager/commit/48df540786d2784c5d7b9bd55786d63e3
- https://github.com/joni1802/ts3-manager/releases/tag/v2.2.6
- https://github.com/joni1802/ts3-manager/security/advisories/GHSA-3cgm-7p4g-gffj
FAQ
What is CVE-2026-54253?
CVE-2026-54253 is a vulnerability with a CVSS score of 8.2 (HIGH). TS3 Manager is modern web interface for maintaining Teamspeak3 servers. Prior to 2.2.6, the /api/download handler in packages/server/routes/api.js passes the attacker-controlled port query parameter t...
How severe is CVE-2026-54253?
CVE-2026-54253 has been rated HIGH with a CVSS base score of 8.2/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-54253?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.