maximhq Bifrost up to 1.x HTTP Transport /api/plugins plugin.Open server-side request forgery

Summaryinfo

A vulnerability classified as critical has been found in maximhq Bifrost up to 1.x. The affected element is the function plugin.Open of the file /api/plugins of the component HTTP Transport. Performing a manipulation results in server-side request forgery. This vulnerability is known as CVE-2026-86242. Remote exploitation of the attack is possible. No exploit is available.

Detailsinfo

A vulnerability, which was classified as critical, was found in maximhq Bifrost up to 1.x. This affects the function plugin.Open of the file /api/plugins of the component HTTP Transport. The manipulation with an unknown input leads to a server-side request forgery vulnerability. CWE is classifying the issue as CWE-918. The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

Bifrost HTTP transport before 2.0.0 accepts an enabled custom plugin whose path is an HTTP URL through unauthenticated POST /api/plugins when management authentication is disabled (the default, governance.auth_config.is_enabled=false). The shared-object loader treats an http-prefixed path as a download URL, writes the body to a temporary .so, and passes it to Go's plugin.Open. After a successful open, optional Init runs immediately with the supplied config as the Bifrost process user. On documented dynamically linked builds (DYNAMIC=1 / no static-link flags), which the vendor requires for custom Go plugins, plugin.Open is expected to succeed and this is unauthenticated remote code execution. On the published statically linked Docker image, plugin.Open fails with Dynamic loading not supported, so that build class is only server-side request forgery. Attack complexity is High because the attacker cannot force RCE on the default static image and a loadable plugin must match the host Go version, OS, architecture, and linkage. The 1.6.x HTTP transport line through 1.6.11 does not contain the fix.

The advisory is shared at github.com. This vulnerability is uniquely identified as CVE-2026-86242 since 09/06/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details are known, but no exploit is available.

Upgrading to version 2.0.0 eliminates this vulnerability.

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Productinfo

Vendor

• maximhq

Name

• Bifrost

Version

• 1.x

Website

• Product: https://github.com/maximhq/bifrost/

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