CTI · reviewed · 2026-09-25

TeamCity RCE Exploit Window Closes Today — Rapid7 Details Permissive XStream Allowlist

Full story & timeline

MITRE ATT&CK

• T1190 Exploit Public-Facing Application Initial Access

Indicators

No curated indicators tied to this case.

Detections

No detection content yet — case analysis did not yield signal-specific telemetry. Check back after the next daily CTI pass.

References

• https://www.rapid7.com/blog/post/ra-unauthenticated-rce-in-jetbrains-teamcity-cve-2026-63077
• https://blog.jetbrains.com/teamcity/2026/07/cve-2026-63077/
• https://www.bleepingcomputer.com/news/security/cisa-ransomware-gangs-now-exploiting-critical-teamcity-flaw/