CVE-2026-123040 Privilege escalation in TrueConf Server
An attacker able to run code as the trueconf user can escalate to root on Linux TrueConf Server hosts.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Harmful if only installed
- Yes
- Needs a specific call
- No
- Fix
- None listed
What is CVE-2026-123040?
CVE-2026-123040 is a high-severity privilege escalation vulnerability in TrueConf Server, published on 11 Nov 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
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.
Weakness: CWE-276
Which versions are affected by CVE-2026-123040?
Having an affected version installed is enough. The problem is in what it ships or how it installs, so no code has to call it.
How do I fix CVE-2026-123040?
No fix has been published for CVE-2026-123040 yet. Limit exposure of the affected software until one is available.
Upgrade, and run services with the fewest rights they need. More about Privilege escalation.
Is CVE-2026-123040 being exploited?
There is no known exploitation of CVE-2026-123040 in the wild and no public exploit code.
Sources
Also known as GHSA-93qv-qx6g-2cv6.