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TeamCity is a JetBrains continuous integration and delivery (CI/CD) server used to automate building, testing, and deploying software.
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CISA said Sept. 23 that ransomware crews are exploiting CVE-2026-63077, an unauthenticated 9.8 RCE in JetBrains TeamCity patched July 25. Any build server patched late has to be handled as breached, including the credentials and signing keys it held.
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The September 3 note closed the investigation without adding a single affected user, but it put project source code and credentials in current Cadence storage inside a blast radius that had been limited to a 2024 backup.
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CVE-2026-63077 was in CISA's KEV catalog on August 5. JetBrains dates the intrusion into its own Cadence environment from August 8 to August 24, and every secret that touched the service now needs rotating.
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The reductions run deepest on the largest machines. That redoes the arithmetic that sent heavy jobs to hardware you own. The per-minute charge GitHub proposed for self-hosted runners still has no new date.
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Build configurations can now authenticate to AWS and Google Cloud without stored keys, provided you accept that the TeamCity server holds the signing key and that rotating it leaves already-issued tokens valid.
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JetBrains says CVE-2026-63077 lets an unauthenticated attacker run arbitrary commands on a TeamCity server. The rotation list it handed Cadence users doubles as the recovery scope for anyone self-hosting.
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Wiz says a TeamCity honeypot exposing JDWP was mining Monero within hours, and GreyNoise counted more than 6,000 unique IPs scanning for the protocol in 90 days.
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