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CVE-2026-56141 – Account Takeover via Predictable Recovery Codes – JetBrains Hub before 2026.1.13…

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Summary

CVE-2026-56141 is a critical (CVSS 9.8) account takeover vulnerability in JetBrains Hub, the on-premises centralized identity management and SSO platform used to authenticate developers across JetBrains tools such as YouTrack and TeamCity. The flaw arises from a cryptographically weak pseudo-random number generator (PRNG) used to produce account restore (recovery) codes, allowing an unauthenticated remote attacker to predict or brute-force a target user’s restore code and fully take over their account. No authentication or user interaction is required for exploitation.

Technical details

  • Root cause: JetBrains Hub generates account restore/recovery codes using a cryptographically weak PRNG (CWE-338), making the codes statistically predictable to an attacker with network access to the Hub instance.
  • Trigger conditions: An attacker needs only network access to an exposed Hub instance and knowledge of (or ability to enumerate) a valid username or account identifier; no credentials or session are required.
  • Attack vector: Fully remote and unauthenticated over the network (AV:N/AC:L/PR:N/UI:N). An attacker submits predicted restore codes against the Hub account recovery endpoint to bypass authentication entirely.
  • Impact: Complete account takeover — the attacker gains full control of the targeted user account, including confidentiality, integrity, and availability of all data and services accessible to that account. Compromise of an administrative Hub account gives an attacker control over the entire identity provider, including SSO sessions for connected JetBrains products.

Affected software

  • JetBrains Hub all versions prior to 2026.1.13757
  • JetBrains Hub all versions prior to 2025.3.148033 (2025.3 branch)
  • JetBrains Hub all versions prior to 2025.2.148048 (2025.2 branch)
  • JetBrains Hub all versions prior to 2025.1.148120 (2025.1 branch)
  • JetBrains Hub all versions prior to 2024.3.148430 (2024.3 branch)
  • JetBrains Hub all versions prior to 2024.2.148429 (2024.2 branch)

Severity

CVSS v3.1 Base Score: 9.8 (Critical)
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Mitigation and recommended actions

  • Immediate action — upgrade JetBrains Hub to one of the following patched builds corresponding to your current release branch:
    • 2026.1.13757
    • 2025.3.148033
    • 2025.2.148048
    • 2025.1.148120
    • 2024.3.148430
    • 2024.2.148429
  • If immediate patching is not possible: Restrict network access to the Hub instance to trusted IP ranges only, blocking unauthenticated internet access to the account recovery endpoint. Audit Hub access logs for unexpected recovery code submission attempts.
  • Invalidate and regenerate all existing restore/recovery codes for all user accounts after upgrading to a patched version.

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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