Vulnerability Description
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.
Related Weaknesses (CWE)
References
- https://github.com/zammad/zammad/commit/4a9dd5f8a85948c5a2f96f6479d785153aac05d7
- https://github.com/zammad/zammad/releases/tag/7.0.2
- https://github.com/zammad/zammad/security/advisories/GHSA-56jc-34c8-2xq4
FAQ
What is CVE-2026-56727?
CVE-2026-56727 is a documented vulnerability. 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 discard...
How severe is CVE-2026-56727?
CVSS scoring is not yet available for CVE-2026-56727. Check NVD for updates.
Is there a patch for CVE-2026-56727?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.