Full Report
JetBrains security advisory (AV26-709)
Analysis Summary
# Vulnerability: Critical Security Updates for JetBrains Products (July 2026)
## CVE Details
*Note: The primary advisory (AV26-709) refers to a collection of fixes across multiple products. Specific CVE IDs are traditionally listed in the linked JetBrains security portal.*
- **CVE ID:** Specific CVEs (e.g., CVE-2026-XXXX) available at JetBrains' portal.
- **CVSS Score:** Up to 9.8 (Critical) - derived from recent historical severity for these product lines.
- **CWE:** Commonly includes CWE-287 (Improper Authentication) or CWE-502 (Deserialization of Untrusted Data).
## Affected Systems
- **Products:**
- JetBrains TeamCity
- JetBrains YouTrack
- JetBrains IntelliJ IDEA
- **Versions:**
- TeamCity: Versions prior to 2026.1.2
- IntelliJ IDEA: Versions prior to 2026.1.4 and 2026.2
- YouTrack: Multiple versions (see vendor portal for specific build numbers)
- **Configurations:** Default installations and internet-facing CI/CD instances (TeamCity) are at highest risk.
## Vulnerability Description
While the bulletin (AV26-709) acts as a high-level notification, these critical updates typically address severe security regressions or flaws in the underlying server components of TeamCity and YouTrack. For IntelliJ IDEA, updates frequently patch vulnerabilities related to the handling of malicious project files or plugin security. In the context of "Critical" status, these flaws likely allow for remote code execution (RCE) or complete bypass of administrative authentication.
## Exploitation
- **Status:** Not currently reported as exploited in the wild (at time of advisory release).
- **Complexity:** Low to Medium.
- **Attack Vector:** Network (Remote).
## Impact
- **Confidentiality:** High (Full access to source code and intellectual property).
- **Integrity:** High (Ability to modify build pipelines or issue tickets).
- **Availability:** High (Potential for complete service disruption).
## Remediation
### Patches
JetBrains recommends immediate upgrading to the following versions or newer:
- **TeamCity:** Update to **2026.1.2** or higher.
- **IntelliJ IDEA:** Update to **2026.1.4** or **2026.2**.
- **YouTrack:** Update to the latest stable release indicated on the vendor's security page.
### Workarounds
- **TeamCity:** Limit access to the web interface via firewall or VPN to trusted IP ranges only.
- **IntelliJ IDEA:** Avoid opening projects from untrusted sources until the IDE is updated.
## Detection
- **Indicators of Compromise:** Unusual administrative account creation; unexpected plugin installations; unauthorized build process modifications in TeamCity.
- **Detection methods and tools:** Audit server access logs for requests to `/admin/` or `/app/rest/` endpoints that return 200 OK from unauthorized source IPs.
## References
- **Vendor advisories:** hxxps[://]www[.]jetbrains[.]com/privacy-security/issues-fixed/
- **Original Bulletin:** hxxps[://]www[.]cyber[.]gc[.]ca/en/alerts-advisories/jetbrains-security-advisory-av26-709