{"id":"CVE-2026-54253","summary":"TS3 Manager: Reflected XSS via /api/download port parameter steals operator session","details":"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.","aliases":["GHSA-3cgm-7p4g-gffj"],"modified":"2026-09-19T03:45:45.245515872Z","published":"2026-09-17T18:37:38.022Z","database_specific":{"cna_assigner":"GitHub_M","cwe_ids":["CWE-79"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/54xxx/CVE-2026-54253.json"},"references":[{"type":"WEB","url":"https://github.com/joni1802/ts3-manager/releases/tag/v2.2.6"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/54xxx/CVE-2026-54253.json"},{"type":"ADVISORY","url":"https://github.com/joni1802/ts3-manager/security/advisories/GHSA-3cgm-7p4g-gffj"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-54253"},{"type":"FIX","url":"https://github.com/joni1802/ts3-manager/commit/48df540786d2784c5d7b9bd55786d63e31288d07"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/joni1802/ts3-manager","events":[{"introduced":"0"},{"fixed":"48df540786d2784c5d7b9bd55786d63e31288d07"},{"fixed":"961f5bdbaf8fe8caa320f3033623b5ad5317ed2e"}],"database_specific":{"source":["AFFECTED_FIELD","REFERENCES"],"extracted_events":[{"introduced":"0"},{"fixed":"2.2.6"}]}}],"versions":["v2.2.5","v2.2.4-rc3","v2.2.4-rc2","v2.2.4-rc1","v2.2.4","v2.2.3","v2.2.2","v2.2.1","v2.2.0","v2.1.0","v2.0.1","v2.0.0","v1.7.3","v1.7.1","v1.7.0","v1.6.1","v1.6.0","v1.5.1","v1.5.0","v1.4.0","v1.3.1","v1.1.1-beta","v1.0.0-alpha"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-54253.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N"}]}