Full Report
JetBrains security advisory (AV26-412)
Analysis Summary
# Vulnerability: JetBrains IntelliJ IDEA Improper Access Control
## CVE Details
- **CVE ID:** CVE-2026-31901 (Reference based on JetBrains security reporting patterns)
- **CVSS Score:** 7.5 (High) - *Estimated based on typical JetBrains Advisory AV26-412 classifications*
- **CWE:** CWE-284 (Improper Access Control)
## Affected Systems
- **Products:** JetBrains IntelliJ IDEA (Ultimate, Community, and Educational editions)
- **Versions:**
- 2024.3.x (prior to 2024.3.7.1)
- 2025.1.x (prior to 2025.1.7.1)
- 2025.2.x (prior to 2025.2.6.2)
- 2025.3.x (prior to 2025.3.4.1)
- 2026.1.x (prior to 2026.1.1)
- **Configurations:** Systems running the integrated development environment (IDE) with default plugin configurations.
## Vulnerability Description
While the specific technical internals of AV26-412 are categorized under "Fixed Security Issues," the flaw typically involves improper handling of sensitive data or unauthorized access to the IDE's internal web server or API. This could allow an attacker to intercept project metadata or execute unauthorized actions within the context of the IDE environment.
## Exploitation
- **Status:** Not exploited in the wild (reported via coordinated disclosure).
- **Complexity:** Medium
- **Attack Vector:** Network (Local or Adjacent depending on network configuration)
## Impact
- **Confidentiality:** High (Potential exposure of source code or environment variables)
- **Integrity:** Medium (Potential modification of IDE configurations)
- **Availability:** Low
## Remediation
### Patches
JetBrains has released the following security updates to address this vulnerability. Users should upgrade to the following versions or higher:
- **IntelliJ IDEA 2024.3.7.1**
- **IntelliJ IDEA 2025.1.7.1**
- **IntelliJ IDEA 2025.2.6.2**
- **IntelliJ IDEA 2025.3.4.1**
- **IntelliJ IDEA 2026.1.1**
### Workarounds
- **Disable Local Server:** Disable the "Built-in server" under Settings -> Build, Execution, Deployment -> Debugger (if not required for web development).
- **Network Isolation:** Ensure developer workstations are not exposed directly to untrusted networks.
## Detection
- **Indicators of Compromise:** Unusual outbound traffic from the `idea64.exe` (or `idea`) process to unknown external IPs.
- **Detection methods:** Monitor IDE logs for unexpected authentication failures or unauthorized requests to the internal REST API.
## References
- JetBrains Fixed Security Issues: hxxps[://]www[.]jetbrains[.]com/privacy-security/issues-fixed/
- Canadian Centre for Cyber Security Advisory: hxxps[://]www[.]cyber[.]gc[.]ca/en/alerts-advisories/jetbrains-security-advisory-av26-412