{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "2.2.6"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "48df540786d2784c5d7b9bd55786d63e31288d07"
            },
            {
              "fixed": "961f5bdbaf8fe8caa320f3033623b5ad5317ed2e"
            }
          ],
          "repo": "https://github.com/joni1802/ts3-manager",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-3cgm-7p4g-gffj"
  ],
  "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"
  },
  "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.",
  "id": "CVE-2026-54253",
  "modified": "2026-09-19T03:30:40.952575892Z",
  "published": "2026-09-17T18:37:38.022Z",
  "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"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "TS3 Manager: Reflected XSS via /api/download port parameter steals operator session"
}