CVE-2026-56142: In JetBrains Hub before 2026

Synopsis

CVE-2026-56142 is a privilege escalation vulnerability in JetBrains Hub, the centralized authentication and team management service used across JetBrains developer tooling. The flaw is reachable over the network and requires only a low-privilege account, with no victim interaction needed; a CVSS v3.1 score of 9.6 Critical reflects its scope-changing impact. Successful exploitation lets an attacker attach arbitrary authentication details to accounts, escalating their privileges and gaining full control over confidentiality, integrity, and availability of affected systems. Patched-image rebuilds at the fix versions are available on HarborGuard for environments running an affected version.

HarborGuard Coverage

Exploit Conditions

• Network reachabilityRequired

  The vulnerability is exposed over the network, meaning an attacker must be able to reach the JetBrains Hub service via a network connection to exploit it.

• AuthenticationRequired

  A low-privilege account is sufficient; no administrative credentials are needed, but the attacker must hold at least one valid user account on the Hub instance.

• Victim interactionNot required

  No victim action such as clicking a link or opening a file is needed; the attacker can exploit the flaw entirely on their own initiative.

• Attack complexityDetail

  Attack complexity is low, meaning the exploit is reliable and requires no special timing, race conditions, or environmental preconditions beyond network access and a valid low-privilege credential.

Blast Radius

• Attacker escalates from a low-privilege account to elevated or administrative privileges by attaching arbitrary authentication details to targeted accounts.
• With elevated access, the attacker reads sensitive data stored in Hub, including user credentials, tokens, and linked service integrations.
• The attacker modifies account configurations, group memberships, and access-control settings across the Hub instance and any connected JetBrains tools.
• The attacker disrupts Hub service availability, blocking developer access to authentication and team management functions across the affected organization.