# CVE-2026-61855: Zammad invalid PGP signature verification on inbound email

Source: https://junglewise.ai/threats/cve-2026-61855-zammad-is-a-web-based-open-source-helpdesk-customer-support  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-25. Updated: 2026-09-26  
License: CC BY 4.0 with a link back

CVE-2026-61855 · Severity: info · Published 2026-09-25

Zammad is a web-based customer support and help desk system. In versions 7.0.3 and 7.1.1, the system can incorrectly mark inbound emails with detached PGP signatures as "good" even when the displayed message content was not actually signed, misleading support agents about email authenticity. This could lead agents to trust fraudulent or tampered messages from attackers impersonating legitimate senders.

Technologies: [Zammad](https://junglewise.ai/threats/technologies/zammad). Vendors: [Zammad](https://junglewise.ai/threats/vendors/zammad).

## Quick answers

**Is CVE-2026-61855 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-61855 being exploited in the wild.

**How severe is CVE-2026-61855?** Informational severity, published 25 September 2026.

**Which products and versions are affected?** Zammad 7.0.3, 7.1.1.

**Is there a fix for CVE-2026-61855?** A patch was published on 2026-08-03: Fixed in version 7.1.2 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-61855 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-61855?** Check whether you run Zammad at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The vulnerability exists in Zammad's PGP signature verification logic for inbound email with detached signatures. Under certain conditions, the system marks a message as carrying a valid signature from a registered key even though the displayed content is not covered by that signature. This is a signature validation bypass affecting the integrity assurance of incoming mail, exploitable via network delivery of specially crafted signed email. A fix is available in version 7.1.2.

## Affected products

- Zammad Zammad 7.0.3, 7.1.1

## Timeline

- 2026-08-04: disclosed
- 2026-08-03: patched: Fixed in version 7.1.2

## References

- [https://github.com/zammad/zammad/commit/dd22716ced9f18861ed6f3b326c9d332c8c2072d](https://github.com/zammad/zammad/commit/dd22716ced9f18861ed6f3b326c9d332c8c2072d)
- [https://github.com/zammad/zammad/security/advisories/GHSA-r957-vp26-563q](https://github.com/zammad/zammad/security/advisories/GHSA-r957-vp26-563q)

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