TLS Certificate Vulnerability in JetBrains IntelliJ IDEA
CVE-2026-123848

7.4HIGH

Key Information:

Vendor

Jetbrains
Status
Intellij Idea
Vendor
CVE Published:
6 November 2026

What is CVE-2026-123848?

JetBrains IntelliJ IDEA versions before 2026.3 are susceptible to a vulnerability where hostname verification for server TLS certificates is not implemented. This oversight may allow attackers to perform man-in-the-middle attacks, compromising secure communications with potentially malicious servers. Users are encouraged to update their software to the latest version to mitigate this security flaw and ensure safe development environments.

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

.