Critical

CISA: Ransomware gangs now exploiting critical TeamCity flaw

BleepingComputer

September 24, 2026 at 10:42 AM

Actively Exploited

Ransomware Vulnerability Update Critical

Overview

The U.S. Cybersecurity and Infrastructure Security Agency (CISA) has issued a warning that ransomware gangs are exploiting a significant vulnerability in JetBrains TeamCity, a continuous integration and deployment tool. This flaw was patched in July, but attackers are now taking advantage of systems that have not yet applied the update. Organizations using TeamCity should be particularly vigilant, as unpatched systems are at risk of being targeted by these ransomware groups. The exploitation of this vulnerability could lead to data breaches and significant downtime for affected businesses. It's crucial for users to ensure that they have the latest security updates installed to protect their systems from potential attacks.

Key Takeaways

Active Exploitation: This vulnerability is being actively exploited by attackers. Immediate action is recommended.
Affected Systems: JetBrains TeamCity
Action Required: Users should apply the patch released in July 2023 to secure their systems against this vulnerability.
Timeline: Disclosed on July 2023

Original Article Summary

The U.S. Cybersecurity and Infrastructure Security Agency (CISA) warned federal agencies on Wednesday that ransomware gangs are now also exploiting a critical JetBrains TeamCity vulnerability patched in July. [...]

Impact

JetBrains TeamCity

Exploitation Status

This vulnerability is confirmed to be actively exploited by attackers in real-world attacks. Organizations should prioritize patching or implementing workarounds immediately.

Timeline

Disclosed on July 2023

Remediation

Users should apply the patch released in July 2023 to secure their systems against this 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 Ransomware, Vulnerability, Update, and 1 more.

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