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Critical TeamCity Flaw Could Let Attackers Run OS Commands Without Logging In

The Hacker News
CVEVulnerabilityUpdateCritical

Overview

JetBrains has alerted users of on-premise TeamCity versions about a serious security vulnerability that could allow attackers to execute arbitrary commands on affected systems without needing to log in. This flaw, identified as CVE-2026-63077, has a high severity score of 9.8, indicating the potential for significant damage if exploited. It impacts all versions of TeamCity On-Premises, prompting JetBrains to recommend that users immediately update to the latest versions, 2025.11.7 or 2026.1.3, to safeguard their installations. TeamCity Cloud users are not affected, as the vulnerability has already been patched in that environment. This issue stresses the importance of timely software updates to prevent unauthorized access and control over systems.

Key Takeaways

  • Affected Systems: TeamCity On-Premises versions; JetBrains
  • Action Required: Users should update to TeamCity versions 2025.
  • Timeline: Newly disclosed

Original Article Summary

JetBrains is urging customers of on-premise versions of TeamCity to update to the latest version following the discovery of a critical security issue that could result in arbitrary code execution. The vulnerability, assigned CVE-2026-63077 (CVSS score: 9.8), affects all TeamCity On-Premises versions. It has been addressed in versions 2025.11.7 and 2026.1.3. TeamCity Cloud instances have already

Impact

TeamCity On-Premises versions; JetBrains

Exploitation Status

No active exploitation has been reported at this time. However, organizations should still apply patches promptly as proof-of-concept code may exist.

Timeline

Newly disclosed

Remediation

Users should update to TeamCity versions 2025.11.7 or 2026.1.3 to mitigate the vulnerability.

Additional Information

This threat intelligence is aggregated from trusted cybersecurity sources. For the most up-to-date information, technical details, and official vendor guidance, please refer to the original article linked below.

Related Topics: This incident relates to CVE, Vulnerability, Update, and 1 more.

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