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Fencer Intel
critical 9.8

CVE-2026-63077 kev+ ransomware in the critical feed json

In JetBrains TeamCity before 2026.1.3, 2025.11.7 unauthenticated remote code execution was possible via the agent polling protocol

published 3mo ago modified 18d ago also EUVD-2026-49369

cvss
9.8
version 3.1, CNA
cisa kev
Exploited
added 2026-08-05, used in ransomware
epss
94.9%
EPSS 94.9% chance of exploitation in 30 days, percentile 99.8%
public exploits
1
Metasploit

Summary

In JetBrains TeamCity before 2026.1.3, 2025.11.7 unauthenticated remote code execution was possible via the agent polling protocol

Patch / fix

cisa required action Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.

  • JetBrains TeamCity 2026.1.3, 2025.11.7

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Timeline

  1. CISA SSVC: exploitation active
  2. First public exploit (Metasploit exploit/multi/http/jetbrains_teamcity_rce_cve_2026_63077)
  3. Published
  4. Added to CISA KEV
  5. CISA patch deadline

Known exploited

Added
3mo ago
Patch by
2026-08-08 (3mo ago)
Ransomware
Known to be used in ransomware campaigns
Required action
Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
Vendor, product
JetBrains, TeamCity
CISA name
JetBrains TeamCity Deserialization of Untrusted Data Vulnerability

CISA SSVC

Exploitation
Active, exploited in the wild
Automatable
yes
Technical impact
total
Assessed
3mo ago

Exploit prediction

94.89% chance of exploitation in the next 30 days, higher than 99.8% of all scored CVEs (FIRST EPSS, 2026-11-11).

Exploits and checks

CVSS scores

assigned by version score vector
CNA 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

  • JetBrains TeamCity

Classification

Weakness
  • CWE-502 Deserialization of Untrusted Data

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.