CVE-2026-56727

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.

• CWE-287
• CWE-347
• CWE-391

• 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

Published

Sep 25, 2026

Last Modified

Sep 25, 2026

Status

Received

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Same Subject, Wrong User: A Cross-Issuer Account Takeover in n8nStrix found an identity-binding bug in n8n's token-exchange flow enabling account takeover.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
• PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
• AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.

• CVE-2026-56721CamaleonCMS version 2.9.2 and earlier contains a privilege e…8.8
• CVE-2026-56722Dompdf is an HTML to PDF converter for PHP. In versions 3.15…5.3
• CVE-2026-56723Zammad is a web based open source helpdesk/customer support …7.1
• CVE-2026-56724Zammad is a web based open source helpdesk/customer support …7.1
• CVE-2026-56725Zammad is a web based open source helpdesk/customer support …8.7
• CVE-2026-56726Zammad is a web based open source helpdesk/customer support …5.1
• CVE-2026-56728Zammad is a web based open source helpdesk/customer support …5.3
• CVE-2026-56729Zammad is a web based open source helpdesk/customer support …2.1
• CVE-2026-5673A flaw was found in libtheora. This heap-based out-of-bounds…7.1
• CVE-2026-56730Zammad is a web based open source helpdesk/customer support …2.1
• CVE-2026-56731Zammad is a web based open source helpdesk/customer support …8.4
• CVE-2026-56732Zammad is a web based open source helpdesk/customer support …5.3