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TI-2026-86010 Aliases CVE-2026-123851GHSA-p3f5-v6j7-7234

Prompt injection protection bypass in JetBrains Junie GitHub Action

Priority LOW 24CWE-180Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Required
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
Low · Low · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA.

Summary

JetBrains Junie GitHub Action before 1.6.4 has a flaw in its prompt injection protection, which validates input before decoding it (CWE-180). A remote attacker without privileges can bypass the protection with HTML-encoded characters when a user interacts with crafted content, which can affect confidentiality and integrity.

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

Description from the CNA

In JetBrains Junie GitHub Action before 1.6.4 prompt injection protection could be bypassed via HTML-encoded characters

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00249 16th percentileScored 2026-11-07
Fix Fixed Junie GitHub Action (JetBrains): 1.6.4

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
JetBrainsJunie GitHub Actionbefore 1.6.41.6.4Patch availableCNA
  • Junie GitHub Action VendorJetBrains Affected before 1.6.4 Fixed in 1.6.4 Patch available CNA

Remediation

Update JetBrains Junie GitHub Action to version 1.6.4.

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

  • Fix · CNA Junie GitHub Action (JetBrains) Fixed in 1.6.4

Timeline

  1. 2026-11-06 Threatist record created from CVE-2026-123851
  2. 2026-11-06 Alias added: GHSA-p3f5-v6j7-7234
  3. 2026-11-06 CISA SSVC decision points changed
  4. 2026-11-06 Priority changed: MEDIUM → LOW

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