CVE-2026-34719

Description

Zammad is a web based open source helpdesk/customer support system. Prior to 7.0.1 and 6.5.4, the webhook model was missing a proper validation for loop back addresses, or link-local addresses — only the URL scheme (HTTP/HTTPS) as well as the hostname was checked. This could end up in retrieving confidential metadata of cloud/hosting providers. The existing check is now extended and is applied when configuring webhooks as well as triggering webhook jobs. This vulnerability is fixed in 7.0.1 and 6.5.4.

PUBLISHED Reserved 2026-03-30 | Published 2026-04-08 | Updated 2026-04-10 | Assigner GitHub_M

Problem types

CWE-918: Server-Side Request Forgery (SSRF)

Product status

References

github.com/...zammad/security/advisories/GHSA-2vgc-vfh2-rw75

cve.org (CVE-2026-34719)

nvd.nist.gov (CVE-2026-34719)

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