Cross-Site Scripting (XSS) in TS3 Manager (CVE-2026-54253)
Summary
Cross-site scripting in TS3 Manager (CVE-2026-54253). Confidential information can be exposed externally. Mitigation: upgrade to 2.2.6 or later.
Original description
The description as published by the source.
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.
Source: NIST National Vulnerability Database NVD
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2026-54253 has been found in TS3 Manager.
Confidential information can be exposed externally. CVSS score: 8.2/10.
What to do: upgrade TS3 Manager to 2.2.6 or later.
If unsure, ask your IT team or search "TS3 Manager CVE-2026-54253" on the vendor's site.
CVE-2026-54253 (TS3 Manager) — CWE-79 / CVSS v3 8.2
Attack vector: remote (network-reachable) / unauthenticated
Patched: 2.2.6 — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
Cross-site scripting (XSS) (CWE-79) exists in TS3 Manager.
Check the vendor advisory for the affected versions of TS3 Manager.
Severity: High (CVSS 8.2/10). Confidential information can be exposed externally.
Update to 2.2.6.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Audit SBOM/dependencies to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
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1Identify exposure identify
Audit SBOM/dependencies for affected components.資産台帳・SBOM・依存マニフェストで TS3 Manager を使っているサービスとバージョンを洗い出す。
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2Apply patch patch
Upgrade TS3 Manager to 2.2.6ステージング環境で 2.2.6 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。
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3Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。