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Wire · regulatory

CISA: Ransomware gangs now exploiting critical TeamCity flaw

24 September 2026 · By · Wire by Fusion42

Published

24 September 2026

Topic

regulatory

◆ Sectors

CybersecurityDeveloper ToolsEnterprise Software

◆ Source

Read at bleepingcomputer.com →

◆ Verified

Fusion42 · 24 September 2026 · Fusion42 review

Ransomware gangs are actively exploiting a critical security flaw in TeamCity, a popular continuous integration and delivery platform, raising urgent cybersecurity concerns.

This Wire brief sits within Fusion42's coverage of Cybersecurity, Developer Tools and Enterprise Software, and 1 source has reported it between 15 Sep 2026 and 24 Sep 2026.

◆ ◆ The Wire takeaway

You must urgently review your use of TeamCity and patch systems now to avoid ransomware attacks exploiting this flaw. Ignoring this puts your development and deployment pipelines directly at risk of disruption.

◆ Coverage

1 source · first reported 15 Sep 2026 · latest 24 Sep 2026

◆ Related on Wire

◆ Topics

CybersecurityDeveloper ToolsEnterprise Softwareransomwaresecurity-flawteamcitycisa-alertcyberattack