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TI-2026-74807 Aliases CVE-2026-111091

Code execution via MCP server configuration in JetBrains Junie CLI

Priority LOW 35CWE-829Published · Updated

Key facts

Attack vector
Local
Privileges required
None
User interaction
Required
Attack complexity
Low
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-829.

Summary

JetBrains Junie CLI before 26.8.3 is affected. Code execution was possible via an untrusted project's MCP server configuration (CWE-829). A local attacker needs user interaction to trigger it, and the impact on confidentiality, integrity and availability is high.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Description from the CNA

In JetBrains Junie CLI before 26.8.3 code execution was possible via an untrusted project's MCP server configuration

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00135 2nd percentileScored 2026-11-07
Fix Fixed Junie CLI (JetBrains): 26.8.3

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
JetBrainsJunie CLIbefore 26.8.326.8.3Patch availableCNA
  • Junie CLI VendorJetBrains Affected before 26.8.3 Fixed in 26.8.3 Patch available CNA

Remediation

Update JetBrains Junie CLI to version 26.8.3.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

  • Fix · CNA Junie CLI (JetBrains) Fixed in 26.8.3

Timeline

  1. 2026-10-16 Threatist record created from CVE-2026-111091

References

Other 1

  • TI-2026-45031 Deserialization of untrusted data in JetBrains TeamCity KEVCVSS 3.1CRITICAL 9.8
  • TI-2024-18053 In JetBrains TeamCity before 2023.11.4 authentication bypass allowing to perform admin actions was possible KEVCVSS 3.1CRITICAL 9.8
  • TI-2023-22884 In JetBrains TeamCity before 2023.05.4 authentication bypass leading to RCE on TeamCity Server was possible KEVCVSS 3.1CRITICAL 9.8
  • TI-2024-18054 In JetBrains TeamCity before 2023.11.4 path traversal allowing to perform limited admin actions was possible KEVCVSS 3.1HIGH 7.3
  • TI-2024-15905 In JetBrains TeamCity before 2023.11.3 authentication bypass leading to RCE was possible CVSS 3.1CRITICAL 9.8
  • TI-2024-24589 Insufficiently protected credentials in JetBrains IntelliJ IDEA CVSS 3.1CRITICAL 9.3
See all 787 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences