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CVE-2026-50242 – Authentication Bypass Leading to Administrative Access – JetBrains Hub (Multiple…

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Summary

CVE-2026-50242 is a maximum-severity (CVSS 10.0) authentication bypass vulnerability in JetBrains Hub, the company’s centralized identity management and Single Sign-On (SSO) service for JetBrains server products. Classified under CWE-306 (Missing Authentication for Critical Function), the flaw enables an unauthenticated remote attacker to bypass authentication via direct database access, resulting in full administrative control of the affected instance. Patches are available across all six fixed builds spanning five actively maintained release branches.

Technical details

  • Root cause: Missing authentication for a critical function (CWE-306); the vulnerability permits direct database access without passing through Hub’s authentication layer.
  • Trigger conditions: No privileges, no user interaction, and no special local access are required — the attack can be launched remotely over the network against any internet-exposed Hub instance.
  • Attack vector: Network (AV:N), with low attack complexity (AC:L), meaning exploitation is straightforward and does not rely on race conditions or unusual configuration.
  • Scope: Changed (S:C) — a successful exploit can affect components beyond Hub itself, including connected JetBrains services that rely on Hub for authentication and authorization.
  • Impact: Complete compromise of confidentiality, integrity, and availability (C:H / I:H / A:H). An attacker who gains administrative access to Hub can manage all users, groups, and permissions across every integrated JetBrains service (such as TeamCity and YouTrack), and may create persistent rogue administrator accounts.

Affected software

  • JetBrains Hub all builds before 2026.1.13757
  • JetBrains Hub all builds before 2025.3.148033
  • JetBrains Hub all builds before 2025.2.148048
  • JetBrains Hub all builds before 2025.1.148120
  • JetBrains Hub all builds before 2024.3.148430
  • JetBrains Hub all builds before 2024.2.148429

Severity

CVSS v3.1 Base Score: 10.0 (CRITICAL)
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Mitigation and recommended actions

  • Immediate action — upgrade Hub: Apply the patched build corresponding to your current release branch:
    • 2026.1.x → upgrade to 2026.1.13757 or later
    • 2025.3.x → upgrade to 2025.3.148033 or later
    • 2025.2.x → upgrade to 2025.2.148048 or later
    • 2025.1.x → upgrade to 2025.1.148120 or later
    • 2024.3.x → upgrade to 2024.3.148430 or later
    • 2024.2.x → upgrade to 2024.2.148429 or later
  • If immediate patching is not feasible: Restrict network access to your Hub instance at the firewall or reverse-proxy level so it is not reachable from untrusted networks, and review administrator account lists for any unauthorized additions.
  • Consult the JetBrains fixed security issues page for official guidance: https://www.jetbrains.com/privacy-security/issues-fixed/

IONIX Status

The IONIX research team is tracking ongoing exploitation attempts and recommends immediate patching. Potentially affected assets are outlined in this post.

References

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