# CVE-2026-56731: Zammad cross-site scripting in ticket creation

Source: https://junglewise.ai/threats/cve-2026-56731-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-2026-56731 · Severity: info · Published 2026-09-25

Zammad is a web-based helpdesk and customer support system. An authenticated user with low-level privileges can inject malicious JavaScript code into ticket titles, which is then stored without sanitization. When other users view the ticket, the injected code executes in their browsers, allowing attackers to steal session data, modify ticket content, or perform other actions on behalf of victims.

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

## Quick answers

**Is CVE-2026-56731 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-56731 being exploited in the wild.

**How severe is CVE-2026-56731?** Informational severity, published 25 September 2026.

**Which products and versions are affected?** Zammad prior to 7.0.1.

**Is there a fix for CVE-2026-56731?** A patch was published on 2026-06-17: GHSA-p9xp-gx8r-4397: fixed in version 7.0.1 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-56731 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-56731?** 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

A stored cross-site scripting (XSS) vulnerability exists in Zammad's ticket creation workflow where user-supplied HTML markup and JavaScript event handlers in ticket titles are persisted without proper sanitization or encoding. An authenticated low-privilege user can exploit this via network access to the ticket creation endpoint. The injected payload executes in the context of other users viewing affected tickets, compromising confidentiality and integrity.

## Affected products

- Zammad Zammad prior to 7.0.1

## Timeline

- 2026-09-25: disclosed: CVE-2026-56731 published
- 2026-06-17: patched: GHSA-p9xp-gx8r-4397: fixed in version 7.0.1

## References

- [https://github.com/zammad/zammad/commit/16a4a2e1be6642ec0c3ba3a76e358ad065f48f78](https://github.com/zammad/zammad/commit/16a4a2e1be6642ec0c3ba3a76e358ad065f48f78)
- [https://github.com/zammad/zammad/security/advisories/GHSA-p9xp-gx8r-4397](https://github.com/zammad/zammad/security/advisories/GHSA-p9xp-gx8r-4397)

## Related threats

- [Zammad stored cross-site scripting in ticket article rendering](https://junglewise.ai/threats/cve-2026-102345-zammad-is-a-web-based-open-source-helpdesk-customer-support)
- [Zammad privilege escalation to root](https://junglewise.ai/threats/cve-2026-102490-all-versions-of-zammad-including-the-latest-alpha-enable-the)
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- [Zammad S/MIME signature verification bypass allows sender impersonation](https://junglewise.ai/threats/cve-2026-84465-zammad-is-a-web-based-open-source-helpdesk-customer-support)
- [Zammad unauthorized data access in External Data Source](https://junglewise.ai/threats/cve-2026-84464-zammad-is-a-web-based-open-source-helpdesk-customer-support)