Zammad up to 7.0.1 Federated Authentication server-side request forgery

Summaryinfo

A vulnerability described as critical has been identified in Zammad up to 7.0.1. The affected element is an unknown function of the component Federated Authentication. The manipulation results in server-side request forgery. This vulnerability is cataloged as CVE-2026-56734. The attack may be launched remotely. There is no exploit available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability, which was classified as critical, was found in Zammad up to 7.0.1. Affected is an unknown code block of the component Federated Authentication. 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. CVE summarizes:

Zammad is a web based open source helpdesk/customer support system. Prior to 7.0.2, during federated authentication (OAuth/OIDC/SAML), a profile image URL from the external identity provider is fetched without verifying the target address. An actor who controls their profile at a connected provider may cause the server to connect to internal network locations. Response timing and error patterns differ between reachable and unreachable targets, allowing internal service probing. Worker processes may be blocked for several seconds per request. Requires a configured external authentication provider where the actor can modify their profile image URL. This issue is fixed in version 7.0.2.

The advisory is available at github.com. This vulnerability is traded as CVE-2026-56734 since 06/22/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The technical details are unknown and an exploit is not available.

Upgrading to version 7.0.2 eliminates this vulnerability.

If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Name

• Zammad

Version

• 7.0.0
• 7.0.1

License

• open-source

Website

• Product: https://github.com/zammad/zammad/

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If you want to get best quality of vulnerability data, you may have to visit VulDB.

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