joni1802 ts3-manager up to 2.2.5 Download api.js handler port cross site scripting

Summaryinfo

A vulnerability, which was classified as problematic, has been found in joni1802 ts3-manager up to 2.2.5. This vulnerability affects the function handler of the file packages/server/routes/api.js of the component Download Handler. Performing a manipulation of the argument port results in cross site scripting. This vulnerability is reported as CVE-2026-54253. The attack is possible to be carried out remotely. No exploit exists. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability classified as problematic has been found in joni1802 ts3-manager up to 2.2.5. This affects the function handler of the file packages/server/routes/api.js of the component Download Handler. The manipulation of the argument port with an unknown input leads to a cross site scripting vulnerability. CWE is classifying the issue as CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. This is going to have an impact on integrity. The summary by CVE is:

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.

It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2026-54253 since 06/12/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. Additional levels of successful authentication are required for exploitation. It demands that the victim is doing some kind of user interaction. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1059.007 according to MITRE ATT&CK.

Upgrading to version 2.2.6 eliminates this vulnerability.

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Productinfo

Vendor

• joni1802

Name

• ts3-manager

Version

• 2.2.0
• 2.2.1
• 2.2.2
• 2.2.3
• 2.2.4
• 2.2.5

Website

• Product: https://github.com/joni1802/ts3-manager/

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