CVE-2026-34721 | BDVDB-2026-325692 Detail

zammadzammad

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.

Impact#

Per CVSS v4.0: confidentiality impact low, integrity impact high, availability impact none. Attack vector: network.

Weaknesses#

CWE-352 Cross-Site Request Forgery (CSRF)

References#

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

Exploit#

No public exploit known

History#

Version 12026-04-08Record published in the CVE List.
Version 22026-04-09Most recent update recorded in the CVE List.

Published

Published: 2026-04-08
Last modified: 2026-04-09

Vendor information

Vendor: zammad
Product: zammad

All zammad vulnerabilities

Score

5.9 Medium

EPSS

less than 1%, Very Low

Estimated chance of exploitation in the next 30 days. EPSS percentile: 1.2.

KEV

Not listed in the CISA Known Exploited Vulnerabilities catalog.

Impact

Cross-Site Request Forgery

Action

No specific action is recorded in the source data. Check the references for vendor guidance.

Affected Systems

Vulnerable
< 6.5.4
Fixed
Not stated
Vulnerable
>= 7.0.0-alpha, < 7.0.1
Fixed
Not stated

Scoring System

CVSS v4.0

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

Metric breakdown
Attack Vector	Network
Attack Complexity	High
Attack Requirements	Present
Privileges Required	Low
User Interaction	Passive
Vulnerable System Confidentiality	Low
Vulnerable System Integrity	High
Vulnerable System Availability	None
Subsequent System Confidentiality	None
Subsequent System Integrity	None
Subsequent System Availability	None

CVSS v3.1

Not available

CVSS v3.0

Not available

CVSS v2

Not available

Source: CVE List v5 (record); CISA KEV (kev, action); FIRST EPSS (epss).