CVE-2026-100255 Auth bypass in TeamCity
Attackers can take over administrator accounts in JetBrains TeamCity via a password reset vulnerability, requiring an upgrade to secure the system.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-100255?
CVE-2026-100255 is a high-severity authentication bypass vulnerability in Jetbrains Teamcity, published on 30 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
In JetBrains TeamCity before 2026.2, 2026.1.4, 2025.11.8 administrator account takeover was possible via password reset
Weakness: CWE-1289
Which versions are affected by CVE-2026-100255?
It affects 1 product.
Products include Jetbrains Teamcity.
How do I fix CVE-2026-100255?
No fix has been published for CVE-2026-100255 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-100255 being exploited?
There is no known exploitation of CVE-2026-100255 in the wild and no public exploit code.
Other vulnerabilities in Jetbrains Teamcity
Sources
Also known as GHSA-4858-hf6j-x5pg.