What is CVE-2026-34721?

CVE-2026-34721 is a medium-severity vulnerability in Zammad, classified under Cross-Site Request Forgery (CSRF). CVSS score: 6.5/10. Published 2026-04-08.

How severe is CVE-2026-34721?

Medium severity. CVSS v3 base score is 6.5 out of 10.

CSRF in Zammad

CVE-2026-34721

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.

Vulnerability class: CSRF (Cross-Site Request Forgery)

EPSS: 0.001 (1.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/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-352 — Cross-Site Request Forgery (CSRF)

References

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

Frequently asked questions

What is CVE-2026-34721?: CVE-2026-34721 is a medium-severity vulnerability in Zammad, classified under Cross-Site Request Forgery (CSRF). CVSS score: 6.5/10. Published 2026-04-08.
How severe is CVE-2026-34721?: Medium severity. CVSS v3 base score is 6.5 out of 10.