CVE-2026-56141 Overview
CVE-2026-56141 is an account takeover vulnerability in JetBrains Hub caused by predictable restore codes. The flaw is classified under [CWE-338] Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG). Attackers can predict the restore codes used during account recovery and take over arbitrary user accounts over the network without authentication or user interaction. JetBrains addressed the issue in Hub versions 2026.1.13757, 2025.3.148033, 2025.2.148048, 2025.1.148120, 2024.3.148430, and 2024.2.148429.
Critical Impact
Unauthenticated remote attackers can predict account restore codes and seize control of any JetBrains Hub user account, including privileged administrative accounts.
Affected Products
- JetBrains Hub prior to 2026.1.13757
- JetBrains Hub 2025.x prior to 2025.3.148033, 2025.2.148048, and 2025.1.148120
- JetBrains Hub 2024.x prior to 2024.3.148430 and 2024.2.148429
Discovery Timeline
- 2026-06-19 - CVE-2026-56141 published to NVD
- 2026-06-24 - Last updated in NVD database
Technical Details for CVE-2026-56141
Vulnerability Analysis
JetBrains Hub is the centralized authentication and user management service used across JetBrains products including YouTrack and TeamCity integrations. The vulnerability resides in the account restore flow, where Hub issues a recovery code that a user can supply to regain access to their account. Because the restore codes are predictable, an attacker who knows or can guess a target's identifier can compute a valid restore code and authenticate as that user. The result is full account takeover without any credentials, multi-factor prompt, or victim interaction.
Root Cause
The root cause is the use of a cryptographically weak or insufficiently random source to generate restore codes [CWE-338]. Predictable PRNG output, low entropy, or deterministic seeding allows an attacker to enumerate or compute the restore code space. Restore codes are intended to act as one-time secret tokens equivalent to a password reset, so any predictability collapses the security of the entire recovery channel.
Attack Vector
The attack is network-reachable through the Hub web interface or API and requires no prior privileges. An attacker identifies a target account, triggers or anticipates a restore code, and submits a predicted value to the restore endpoint. Once accepted, the attacker controls the account session and can pivot to connected JetBrains services, source code repositories, and CI/CD pipelines tied to that identity.
No verified public proof-of-concept code is available. Refer to the JetBrains Security Issues Fixed advisory for vendor-supplied technical details.
Detection Methods for CVE-2026-56141
Indicators of Compromise
- Unexpected successful account restore events in Hub audit logs, especially for administrative or service accounts.
- High volumes of restore code submissions or failed restore attempts from a single source IP.
- Authentication sessions originating from unusual geolocations or autonomous system numbers immediately after a restore event.
- New OAuth tokens, API keys, or SSH keys created shortly after an account recovery.
Detection Strategies
- Correlate Hub restore-flow events with subsequent privilege-sensitive actions such as permission changes or token creation.
- Alert on restore code submissions that succeed without a preceding user-initiated reset request.
- Hunt for sequential or repeated restore attempts against multiple usernames from the same client.
Monitoring Recommendations
- Forward Hub authentication and audit logs to a centralized SIEM with retention sufficient to cover the disclosure window.
- Baseline normal restore-code usage frequency and trigger alerts on deviations.
- Monitor downstream JetBrains services (YouTrack, TeamCity, Space) for session reuse tied to recently restored accounts.
How to Mitigate CVE-2026-56141
Immediate Actions Required
- Upgrade JetBrains Hub to a fixed version: 2026.1.13757, 2025.3.148033, 2025.2.148048, 2025.1.148120, 2024.3.148430, or 2024.2.148429.
- Force a password reset and invalidate active sessions and API tokens for all Hub users after upgrading.
- Review Hub audit logs for unauthorized restore events dating back to before the patch deployment.
- Rotate any credentials, OAuth tokens, or integration secrets that may have been exposed through a compromised account.
Patch Information
JetBrains has released fixed builds across all maintained Hub branches. Administrators should apply the version corresponding to their current release line and confirm the upgrade via the Hub administration console. See the JetBrains Security Issues Fixed page for the vendor advisory.
Workarounds
- Restrict network access to the Hub instance using firewall rules or a reverse proxy until patching is complete.
- Temporarily disable the account restore feature if operationally feasible.
- Enforce multi-factor authentication on all accounts to reduce the impact of session hijack following a successful restore.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
