Improper Certificate Validation in JetBrains IntelliJ IDEA
CVE-2026-123306

7.4HIGH

Key Information:

Vendor

Jetbrains
Status
Intellij Idea
Vendor
CVE Published:
6 November 2026

What is CVE-2026-123306?

In versions of JetBrains IntelliJ IDEA prior to 2026.3, a vulnerability exists that allows improper handling of server certificates. Specifically, during headless operation, the application can mistakenly permit unverified server certificates into its trust store. This flaw may expose users to potential security risks as it bypasses standard security checks, allowing untrusted entities to impersonate legitimate servers.

Affected Version(s)

IntelliJ IDEA 0 < 2026.3

References

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

CVSS V3.1

Score:
7.4
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
High
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.