Vulnerability · Published Apr 8, 2026 · Assigned by GitHub_M

CVE-2026-34719Zammad has a Server-side request forgery (SSRF) via webhooks

Medium 4.3

In plain English

A medium-severity server-side request forgery in zammad from zammad. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 17% of all known vulnerabilities).

Severity (CVSS 3.1)4.3Medium

Exploit odds (30 days)0.3%top 83.0% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
zammad	zammad	< 6.5.4>= 7.0.0-alpha, < 7.0.1

Weakness: CWE-918 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

References

https://github.com/zammad/zammad/security/advisories/GHSA-2vgc-vfh2-rw75 x_refsource_CONFIRM