CVE-2026-34721

Zammad has Cross-site request forgery (CSRF) in OAuth callback endpoints

State: Published
Severity: 5.9 Medium
Published: Apr 8, 2026
Updated: Apr 9, 2026
Reserved: Mar 30, 2026

Description

Zammad is a web based open source helpdesk/customer support system. Prior to 7.0.1 and 6.5.4, the OAuth callback endpoints for Microsoft, Google, and Facebook external credentials do not validate a CSRF state parameter. This vulnerability is fixed in 7.0.1 and 6.5.4.

Scores

CVSS	Score	Vector	Source
4.0	5.9 Medium	CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:P/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N	GitHub_M

Weaknesses

CWE-352 Cross-Site Request Forgery (CSRF)

Affected Products

Product	Versions
zammadzammad	< 6.5.4Affected >= 7.0.0-alpha, < 7.0.1Affected

References

https://github.com/zammad/zammad/security/advisories/GHSA-mfwp-hx66-626c

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