CVE-2026-100277 Auth bypass in YouTrack
Attackers can take over user accounts by replaying notification signatures in JetBrains YouTrack, requiring an upgrade to the latest version.
- 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-2026-100277?
CVE-2026-100277 is a high-severity authentication bypass vulnerability in Jetbrains Youtrack, 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 YouTrack before 2026.2.19197 account takeover was possible by replaying a notification signature
Weakness: CWE-863
Which versions are affected by CVE-2026-100277?
It affects 1 product.
Products include Jetbrains Youtrack.
How do I fix CVE-2026-100277?
No fix has been published for CVE-2026-100277 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-2026-100277 being exploited?
There is no known exploitation of CVE-2026-100277 in the wild and no public exploit code.
Other vulnerabilities in Jetbrains Youtrack
Sources
Also known as GHSA-mqhr-7f7q-h475.