Security Advisory

CVE-2026-34719

CVE vulnerability detail — eXtreme Datacenter Security Operations

Published 2026-04-08 18:02:16

Last updated 2026-04-10 20:38:50

Assigner GitHub_M

State PUBLISHED

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.

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