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Description

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 Reserved 2026-03-18 | Published 2026-05-27 | Updated 2026-05-28 | Assigner VulDB




MEDIUM: 6.9CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X
MEDIUM: 5.3CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:X/RL:O/RC:C
MEDIUM: 5.3CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:X/RL:O/RC:C
5.0AV:N/AC:L/Au:N/C:N/I:N/A:P/E:ND/RL:OF/RC:C

Problem types

Reachable Assertion

Timeline

2026-05-27:Advisory disclosed
2026-05-27:VulDB entry created
2026-05-27:VulDB entry last update

Credits

Michael Imfeld (modzero) finder

References

vuldb.com/vuln/366316 (VDB-366316 | TeamSpeak 3 Server clientek Handshake assertion) vdb-entry technical-description

vuldb.com/vuln/366316/cti (VDB-366316 | CTI Indicators (IOB, IOC, IOA)) signature permissions-required

modzero.com/en/advisories/mz-26-01-teamspeak/ related

files.teamspeak-services.com/...security/TS-SA-2026-001.html related

www.teamspeak.com/en/downloads/ patch

cve.org (CVE-2026-4392)

nvd.nist.gov (CVE-2026-4392)

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