CVE-2026-123040

publishedCWE-276

An attacker who gains the ability to execute arbitrary code on a system with TrueConf Server (Linux) versions from 4.7.2 up to, but not including, 5.5.6 installed, running as the user trueconf (by exploiting some other vulnerability), can elevate their privileges to root.

Technical severity8.5 highCVSS 4.0 · CNA: Kaspersky

Published2026-11-11Source updated 2026-11-11

Collected2026-11-111 attributed source

Fixes and workarounds

Fix

Update TrueConf Server (Linux) to versions 5.5.6 or newer.

Source: CNA: Kaspersky

Workaround

Perform a full check with anti-virus software that has up-to-date anti-virus databases and software modules.

Source: CNA: Kaspersky

Affected products and versions

Affected products, source version ranges and reporting authorities
Product	Versions	Authority
TrueConf Server TrueConf Platforms: Linux	≥ 4.7.2; < 5.5.6 (affected, semver) Other versions: unaffected	CNA: Kaspersky

Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.

CVSS assessments

CVSS scores, vectors and reporting authorities
Version / score	Vector	Authority
4.0 / 8.5 high	`CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N`	CNA: Kaspersky
3.1 / 7.8 high	`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`	CNA: Kaspersky

Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

References

https://ics-cert.kaspersky.com/advisories/2026/11/10/trueconf-server-linux-incorrect-default-permissions/CNA: Kaspersky · third-party-advisory

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