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In Zammad 6.4.x before 6.4.2, SSRF can occur. Authenticated admin users can enable webhooks in Zammad, which are triggered as POST requests when certain conditions are met. If a webhook endpoint returned a redirect response, Zammad would follow it automatically with another GET request. This could be abused by an attacker to cause GET requests for example in the local network.
Reserved 2025-04-05 | Published 2025-04-05 | Updated 2025-04-07 | Assigner mitreCWE-918 Server-Side Request Forgery (SSRF)
zammad.com/en/advisories/zaa-2025-01
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