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CISA Adds JetBrains TeamCity CVE-2026-63077 to Known Exploited Vulnerabilities Catalog After Active Attacks

The US Cybersecurity and Infrastructure Security Agency has added a critical vulnerability in JetBrains TeamCity to its Known Exploited Vulnerabilities catalog due to confirmed exploitation in the wild. The flaw, tracked as CVE-2026-63077, stems from unsafe deserialization of untrusted data over the agent polling protocol and permits unauthenticated remote code execution. TeamCity is widely used for automating software build, test, and deployment pipelines in development environments. CISA directed all US federal agencies to apply vendor mitigations within three days, by August 8, 2026. Organizations running the continuous integration server are urged to review exposure and implement the recommended fixes immediately to prevent further compromise.

Security NEXTTranslated from Japanese

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US authorities have issued an urgent alert regarding active exploitation of a vulnerability in JetBrains TeamCity, a popular continuous integration and continuous deployment server used for automating software builds, testing, and deployments.

The Cybersecurity and Infrastructure Security Agency (CISA) added the flaw, identified as CVE-2026-63077, to its Known Exploited Vulnerabilities (KEV) catalog on August 5, 2026. The vulnerability arises from the deserialization of untrusted data through the agent polling protocol, enabling remote attackers to execute arbitrary code without requiring authentication.

TeamCity serves as a central development support server that orchestrates build and release processes across many enterprise environments. Because the issue allows unauthenticated remote code execution, successful exploitation can lead to full compromise of the build infrastructure and potential supply-chain risks for downstream software releases.

In response to confirmed attacks, CISA has mandated that US federal agencies apply the vendor-provided mitigations no later than August 8, 2026. The agency also warned that the vulnerability is being actively exploited, meaning any organization using the product should treat the issue with high priority and verify their exposure immediately.

CISAJetBrainsTeamCityCVE-2026-63077
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