Prompt Injection Bypass in JetBrains Junie GitHub Action
CVE-2026-123851

5.4MEDIUM

Key Information:

Vendor

Jetbrains
Status
Junie Github Action
Vendor
CVE Published:
6 November 2026

What is CVE-2026-123851?

In earlier versions of JetBrains Junie GitHub Action, prior to 1.6.4, an issue was identified where the prompt injection protection mechanism could be compromised through the use of HTML-encoded characters. This could allow an attacker to manipulate inputs and potentially execute unauthorized commands or retrieve sensitive data.

Affected Version(s)

Junie GitHub Action 0 < 1.6.4

References

https://www.jetbrains.com/privacy-security/issues-fixed/

CVSS V3.1

Score:
5.4
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
Required
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.