CVE-2026-34721 MEDIUM

CVE-2026-34721: Zammad has Cross-site request forgery (CSRF) in OAuth callback endpoints

Vendor Zammad
Product zammad
Weakness CWE-352 · CSRF
Published April 8, 2026
Last update April 9, 2026
View on NVD All CVEs

CVSS base score

5.9/10
Attack vector Network
Attack complexity High
Privileges required Low
User interaction —
Confidentiality —
Integrity —

CVSS vector

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

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

April 8, 2026 CVE published
April 9, 2026 Record updated