CISA Flags TeamCity CVE-2026-63077 RCE Flaw Under Active Exploitation in the Wild
CISA flags TeamCity CVE-2026-63077 RCE flaw under active exploitation.
CISA has issued a warning about active exploitation of a critical remote code execution vulnerability (CVE-2026-63077) in on-premise versions of JetBrains TeamCity. The flaw, which allows unauthenticated attackers to bypass security checks and execute arbitrary commands, has a CVSS score of 9.8. Federal agencies are required to patch this vulnerability by August 8, 2026.
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The lesson from this incident
Full lessonA critical unauthenticated remote code execution vulnerability (CVE-2026-63077, CVSS 9.8) in JetBrains TeamCity on-premise installations is being actively exploited in the wild, allowing attackers to bypass security controls and execute arbitrary commands without any credentials. This type of flaw is particularly dangerous because it requires no user interaction or authentication, meaning any internet-exposed instance is immediately at risk. CI/CD platforms like TeamCity are high-value targets since they sit at the heart of software build pipelines and can be leveraged to inject malicious code into downstream software. CISA's inclusion in the Known Exploited Vulnerabilities (KEV) catalog confirms real-world abuse is underway, making delayed patching an unacceptable risk. Organizations running on-premise versions must treat this as a critical incident requiring emergency response, not routine maintenance.
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- Endpoint detection and response (EDR and XDR)
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Indicators of Compromise
Extracted by AI from the linked source. Not reviewed by an editor. How this works
- cve — CVE-2026-63077