Missing Authentication for Critical Function in IntelliJ IDEA - CVE-2026-123278
Published: November 6, 2026
Vulnerability identifier: #VU159667
CSH Severity: High
CVSS v4: 9.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-123278
CWE-ID: CWE-306
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to execute arbitrary code.
The vulnerability exists due to missing authentication in the JDBC worker RMI endpoint when handling remote method invocation requests. A remote attacker can invoke the unauthenticated endpoint to execute arbitrary code.
Affected software
IntelliJ IDEA
How to mitigate CVE-2026-123278
Install security update from vendor's website.
IntelliJ IDEA - update to 2026.3