CVE-2026-56141: In JetBrains Hub before 2026

Synopsis

An authentication bypass vulnerability in JetBrains Hub allows a remote, unauthenticated attacker to take over user accounts by exploiting predictable account restore codes. The service is reachable over the network and requires no credentials or user interaction to exploit. Successful exploitation gives the attacker full control of the targeted account, enabling them to read, modify, or delete anything that account can access. Patched-image rebuilds at the fix versions are available on HarborGuard for environments running an affected version.

HarborGuard Coverage

Exploit Conditions

• Network reachabilityRequired

  The attacker must be able to reach the JetBrains Hub service over the network; any internet-exposed or internally routable Hub instance is within scope.

• AuthenticationNot required

  No credentials are needed; the restore-code flow is accessible to unauthenticated users by design, and the predictability flaw is exploitable before any login.

• Victim interactionNot required

  The attacker operates entirely independently; no user needs to click a link, open a file, or take any action for exploitation to succeed.

• Attack complexityDetail

  Attack complexity is low, meaning the exploit is reliable and imposes no special preconditions such as race conditions or specific memory layout requirements.

Blast Radius

• The attacker gains full control of the targeted Hub account, reading all associated project data, tokens, and credentials stored within it.
• The attacker can modify or delete repository access rules, service integrations, and any other settings the compromised account governs.
• If the compromised account holds administrative privileges, the attacker can pivot to control other user accounts and system-wide Hub configuration.
• Account takeover exposes any connected JetBrains toolchain services (such as YouTrack or TeamCity instances) that trust Hub for authentication.