RabbitMQ up to 4.2.8/4.3.2 OAuth2 Authentication rabbitmgmtoauthbootstrap.erl oauthclientsecret information disclosure

Summaryinfo

A vulnerability, which was classified as problematic, was found in RabbitMQ up to 4.2.8/4.3.2. The impacted element is an unknown function of the file deps/rabbitmqmanagement/src/rabbitmgmtoauthbootstrap.erl of the component OAuth2 Authentication. Such manipulation of the argument oauthclientsecret leads to information disclosure. This vulnerability is traded as CVE-2026-67410. The attack may be launched remotely. There is no exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in RabbitMQ up to 4.2.8/4.3.2. Affected by this issue is some unknown functionality of the file deps/rabbitmqmanagement/src/rabbitmgmtoauthbootstrap.erl of the component OAuth2 Authentication. The manipulation of the argument oauthclientsecret with an unknown input leads to a information disclosure vulnerability. Using CWE to declare the problem leads to CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. Impacted is confidentiality. CVE summarizes:

RabbitMQ is a messaging and streaming broker. From 4.2.0 until 4.3.3 and 4.2.9, OAuth2 Client Secret Exposed via Unauthenticated JavaScript Endpoint (CWE-200). when OAuth2 authentication is enabled for the RabbitMQ Management UI and the configured flow, IDP use a client secret, the oauthclientsecret configuration value is included in the JavaScript served by the unauthenticated endpoint /js/oidc-oauth/bootstrap.js. Any user who can reach the management UI port can retrieve the OAuth2 client secret without Files: deps/rabbitmqmanagement/src/rabbitmgmtwmauth.erl, line 186 deps/rabbitmqmanagement/src/rabbitmgmtoauthbootstrap.erl, lines 35-50 deps/rabbitmqmanagement/src/rabbitmgmtdispatcher.erl, lines 45-49 (route registration) Code Path: 1. The route /js/oidc-oauth/bootstrap.js is registered as a plain Cowboy handler (rabbitmgmtdispatcher.erl:46): Credential exposure for the affected configuration: OAuth2 client secret is accessible without any authentication Token theft: Attacker can complete the authorization code flow using stolen authorization codes Client impersonation: Attacker can make requests. Any RabbitMQ deployment with: This issue is fixed in versions 4.3.3 and 4.2.9.

The advisory is shared for download at github.com. This vulnerability is handled as CVE-2026-67410 since 07/29/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1592.

Upgrading to version 4.2.9 or 4.3.3 eliminates this vulnerability.

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Productinfo

Name

• RabbitMQ

Version

• 4.2.0
• 4.2.1
• 4.2.2
• 4.2.3
• 4.2.4
• 4.2.5
• 4.2.6
• 4.2.7
• 4.2.8
• 4.3.0
• 4.3.1
• 4.3.2

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CPE 2.2info

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