Read the docs
TI-2026-85819 Aliases CVE-2026-123277GHSA-xh9w-6qf8-p8xw

Missing authentication in JetBrains CLion exposes debug environment

Priority LOW 22CWE-306Published · Updated

Key facts

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

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-306.

Summary

JetBrains CLion before 2026.3, 2026.2.4.1 on Linux lacks authentication for functionality that exposes the debug session environment. A local user with low privileges can obtain that environment because of missing authentication for critical functionality (CWE-306), which requires the victim to take part in the action. An attacker can read sensitive data but cannot change it.

Written with Claude Haiku 5.5 from the sources below · 2026-11-06

Description from the CNA

In JetBrains CLion before 2026.3, 2026.2.4.1 missing authentication allowed local users to obtain the debug session environment on Linux

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00121 1st percentileScored 2026-11-07
Fix Fixed CLion (JetBrains): 2026.3, 2026.2.4.1

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

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

Affected products

VendorProductAffected versionsFixed inStatusSource
JetBrainsCLionbefore 2026.3, 2026.2.4.12026.3, 2026.2.4.1Patch availableCNA
  • CLion VendorJetBrains Affected before 2026.3, 2026.2.4.1 Fixed in 2026.3, 2026.2.4.1 Patch available CNA

Remediation

Upgrade JetBrains CLion to 2026.3 or 2026.2.4.1.

Written with Claude Haiku 5.5 from the sources below · 2026-11-06

  • Fix · CNA CLion (JetBrains) Fixed in 2026.3, 2026.2.4.1

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    JetBrains CLion 2026.3, 2026.2.4.1

    2 records Highest priority Priority LOW 2 LOW

    Other records, highest priority first

    • TI-2026-85818 Code execution in JetBrains CLion Safe Mode via GDB debug profilePriority LOW 35
    Show all 2 records →

Timeline

  1. 2026-11-06 Threatist record created from CVE-2026-123277
  2. 2026-11-06 Alias added: GHSA-xh9w-6qf8-p8xw
  3. 2026-11-06 CISA SSVC decision points changed

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