Quick answers
- Is CVE-2026-123040 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-123040 being exploited in the wild.
- How severe is CVE-2026-123040?
- High severity, with a CVSS score of 7.8, published 11 November 2026.
- Which products and versions are affected?
- Trueconf Server (Linux) 4.7.2 to 5.5.5.
- Is there a fix for CVE-2026-123040?
- Yes: fixed in 5.5.6. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-123040 attacked?
- It is attacked with local access.
- Am I affected by CVE-2026-123040?
- Check whether you run Trueconf Server (Linux) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
How to fix
- Fixed in: 5.5.6
Technical details
This is a privilege escalation vulnerability (CWE-276: Incorrect Default Permissions) affecting TrueConf Server on Linux. An attacker with local code execution as the trueconf user can escalate to root because the application sets overly permissive default file permissions. The attack requires prior code execution capability as the trueconf service user; no network access or additional user interaction is needed.
Affected products
- TrueConf Server (Linux) 4.7.2 to 5.5.5
Timeline
- 2026-11-10: disclosed
- 2026-11-10: advisory