JetBrains fixes critical unauthenticated RCE in TeamCity On-Premises (CVE-2026-63077)

JetBrains has fixed a critical vulnerability (CVE-2026-63077) affecting TeamCity On-Premises and is urging admins to upgrade self-hosted servers as soon as possible. “For those who are unable to do so, we have released a security patch plugin,” noted Daniel Gallo, Solutions Engineering Lead at JetBrains. TeamCity as a possible target JetBrains TeamCity is a widely used continuous integration and continuous delivery (CI/CD) server solution.