# CVE-2026-56734: Zammad SSRF in federated authentication profile image fetch

Source: https://junglewise.ai/threats/cve-2026-56734-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-2026-56734 · Severity: info · Published 2026-09-25

Zammad is an open-source helpdesk and customer support system. When using federated authentication (OAuth, OIDC, or SAML), the application fetches profile images from external identity providers without validating the target URL. An attacker who controls their profile at a connected provider can cause the Zammad server to connect to internal network addresses, enabling internal service discovery through response timing analysis.

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

## Quick answers

**Is CVE-2026-56734 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-56734 being exploited in the wild.

**How severe is CVE-2026-56734?** Informational severity, published 25 September 2026.

**Which products and versions are affected?** Zammad before 7.0.2.

**Is there a fix for CVE-2026-56734?** A patch was published on 2026-06-17: Fixed in version 7.0.2 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-56734 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-56734?** 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 is a Server-Side Request Forgery (SSRF) in the avatar fetching mechanism during federated authentication. An authenticated attacker at a connected external identity provider can supply a malicious profile image URL that targets internal network resources; the application fetches the URL without validation. Timing differences and error patterns between reachable and unreachable targets allow reconnaissance of internal services, and worker processes can be blocked during long-timeout requests.

## Affected products

- Zammad Zammad before 7.0.2

## Timeline

- 2026-09-25: disclosed
- 2026-06-17: patched: Fixed in version 7.0.2

## References

- [https://github.com/zammad/zammad/commit/1fae97d92496a643ea1490fb17070881e4e091d5](https://github.com/zammad/zammad/commit/1fae97d92496a643ea1490fb17070881e4e091d5)
- [https://github.com/zammad/zammad/releases/tag/7.0.2](https://github.com/zammad/zammad/releases/tag/7.0.2)

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