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Medium severity4.3NVD Advisory· Published Apr 8, 2026· Updated Apr 17, 2026

CVE-2026-34719

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.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

3
  • Zammad/Zammad3 versions
    cpe:2.3:a:zammad:zammad:*:*:*:*:*:*:*:*+ 2 more
    • cpe:2.3:a:zammad:zammad:*:*:*:*:*:*:*:*range: <6.5.4
    • cpe:2.3:a:zammad:zammad:7.0.0:*:*:*:*:*:*:*
    • (no CPE)range: <=7.0.0, <=6.5.3

Patches

Vulnerability mechanics

References

1

News mentions

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