CVE-2026-100259 Missing authorization in YouTrack
Users with view-only access can improperly edit Gantt charts in JetBrains YouTrack, allowing unauthorized data modification.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-100259?
CVE-2026-100259 is a medium-severity missing authorization vulnerability in Jetbrains Youtrack, published on 30 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
In JetBrains YouTrack before 2026.2.18991 improper access control on Gantt chart allowed edits by users with view-only access
Weakness: CWE-863
Which versions are affected by CVE-2026-100259?
It affects 1 product.
Products include Jetbrains Youtrack.
How do I fix CVE-2026-100259?
No fix has been published for CVE-2026-100259 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-100259 being exploited?
There is no known exploitation of CVE-2026-100259 in the wild and no public exploit code.
Other vulnerabilities in Jetbrains Youtrack
Sources
Also known as GHSA-9vmv-xhw6-9wrm.