Zammad up to 7.0.1 Inbound PGP Email Processing return value

Summaryinfo

A vulnerability was found in Zammad up to 7.0.1 and classified as problematic. This impacts an unknown function of the component Inbound PGP Email Processing. Executing a manipulation can lead to return value. This vulnerability is handled as CVE-2026-56727. The attack can be executed remotely. There is not any exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability has been found in Zammad up to 7.0.1 and classified as problematic. This vulnerability affects an unknown code of the component Inbound PGP Email Processing. The manipulation with an unknown input leads to a return value vulnerability. The CWE definition for the vulnerability is CWE-252. The product does not check the return value from a method or function, which can prevent it from detecting unexpected states and conditions. As an impact it is known to affect integrity. CVE summarizes:

Zammad is a web based open source helpdesk/customer support system. Prior to 7.0.2, summary In Zammad's inbound PGP email processing, the return value of the gpg verification call was silently discarded. Regardless of whether gpg reported a valid, invalid, or missing signature, the handler unconditionally wrote sign: { success: true, comment: "Good signature" } to the article's security preferences. Impact Any sender could tamper with the body of a multipart/signed PGP email, or craft a message with an entirely fabricated or mismatched signature, and Zammad would display it to the recipient as cryptographically verified with a "Good signature" label. Users and agents relying on Zammad's signature indicator to confirm message authenticity and integrity would be misled into trusting modified or forged content. The vulnerability affects all inbound PGP-signed emails processed while the PGP integration is enabled. This issue is fixed in version 7.0.2.

The advisory is available at github.com. This vulnerability was named CVE-2026-56727 since 06/22/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. The technical details are unknown and an exploit is not available.

Upgrading to version 7.0.2 eliminates this vulnerability.

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Productinfo

Name

• Zammad

Version

• 7.0.0
• 7.0.1

License

• open-source

Website

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

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