What is CVE-2026-34719?

CVE-2026-34719 is a medium-severity vulnerability in Zammad, classified under Server-Side Request Forgery (SSRF). CVSS score: 4.3/10. Published 2026-04-08.

How severe is CVE-2026-34719?

Medium severity. CVSS v3 base score is 4.3 out of 10.

SSRF in Zammad

CVE-2026-34719

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.

Vulnerability class: SSRF (Server-Side Request Forgery)

EPSS: 0.002 (15.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N.

Affected products

Zammad — versions < 6.5.4, 7.0.0, >= 7.0.0-alpha, < 7.0.1

Weakness classification (CWE)

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

References

security-advisories@github.com (x_refsource_CONFIRM, Vendor Advisory)

Frequently asked questions

What is CVE-2026-34719?: CVE-2026-34719 is a medium-severity vulnerability in Zammad, classified under Server-Side Request Forgery (SSRF). CVSS score: 4.3/10. Published 2026-04-08.
How severe is CVE-2026-34719?: Medium severity. CVSS v3 base score is 4.3 out of 10.