CVE-2026-34719
Zammad has a Server-side request forgery (SSRF) via webhooks
CVSS Score
4.3
EPSS Score
0.0%
EPSS Percentile
11th
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.
| CWE | CWE-918 |
| Vendor | zammad |
| Product | zammad |
| Published | Apr 8, 2026 |
| Last Updated | Apr 10, 2026 |
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Affected Versions
zammad / zammad
< 6.5.4 >= 7.0.0-alpha, < 7.0.1