Is CVE-2026-34721 actively exploited?

CVE-2026-34721 has no public evidence of in-the-wild exploitation as of 2026-04-17.

What is the CVSS score for CVE-2026-34721?

CVE-2026-34721 has a CVSS score of 5.9 (MEDIUM severity). 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X.

How do I patch CVE-2026-34721?

Patch guidance is available from zammad security advisories. CVEDatabase generates AI-assisted remediation guidance on demand for CVE-2026-34721.

Which products are affected by CVE-2026-34721?

2 products: zammad zammad, zammad zammad.

CVE-2026-34721 - remediation guidance & executive summary

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.

CVSS Metrics

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector: network
Complexity: high
Privileges: low
User Action: passive
Confidentiality: undefined
Integrity: undefined
Availability: undefined
Weaknesses: CWE-352 · Cross-Site Request Forgery

Metadata

Primary Vendor: ZAMMAD
Published: 4/8/2026
Last Modified: 4/17/2026
Source: NIST NVD
Note: Verify all details with official vendor sources before applying patches.

Affected Products

zammad : zammadzammad : zammad

Remediation Guidance

Executive Summary

Cite this page

CVE-2026-34721. CVEDatabase.com. Retrieved 1 May 2026. https://cvedatabase.com/cve/CVE-2026-34721

View on NIST NVD

CVE-2026-34721 vulnerability