Vulnerability in Teamspeak 3 Server
CVE-2026-4392
A vulnerability was detected in TeamSpeak 3 Server up to 3.13.7. This issue affects some unknown processing of the component clientek Handshake Handler. Performing a manipulation of the argument proof results in reachable assertion. Remote exploitation of the attack is possible. Upgrading to version 3.13.8 is capable of addressing this issue. Upgrading the affected component is recommended.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.
EPSS exploit prediction
EPSS: 0.006 (48.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 48th percentile — 48.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.006 · change: +0.002
Affected products
- Teamspeak 3 Server — versions 3.13.0, 3.13.1, 3.13.2
Weakness classification (CWE)
References
- vuldb.com/vuln/366316 (technical-description, vdb-entry)
- vuldb.com/vuln/366316/cti (signature, permissions-required)
- modzero.com/en/advisories/mz-26-01-teamspeak/ (related)
- files.teamspeak-services.com/docs/security/TS-SA-2026-001.html (related)
- www.teamspeak.com/en/downloads/ (patch)
Frequently asked questions
- What is CVE-2026-4392?
- CVE-2026-4392 is a medium-severity vulnerability in Teamspeak 3 Server, classified under Reachable Assertion. CVSS score: 5.3/10. Published 2026-05-27.
- How severe is CVE-2026-4392?
- Medium severity. CVSS v3 base score is 5.3 out of 10.