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CVE-2026-34720

LOW CVSS 4.0: 2.3 EPSS 0.02%
Updated Apr 17, 2026
Zammad
Parameter Value
CVSS 2.3 (LOW)
Affected Versions before 6.5.4
Fixed In 7.0.1
Type CWE-346 (Origin Validation Error)
Vendor Zammad
Public PoC No

Zammad is a web based open source helpdesk/customer support system. Prior to 7.0.1 and 6.5.4, the SSO mechanism in Zammad was not verifying the header originates from a trusted SSO proxy/gateway before applying further actions on it. This vulnerability is fixed in 7.0.1 and 6.5.4.

Attack Parameters

Attack Vector
Network
Can be exploited remotely
Attack Complexity
High
Difficult to exploit
Attack Requirements
Present
Additional conditions required
Privileges Required
Low
Basic privileges needed
User Interaction
None
No user interaction needed

Impact Assessment

Confidentiality
Low
Partial data leak
Integrity
Low
Partial data modification
Availability
None
No disruption

CVSS Vector v4.0

Vulnerable Products 2

Configuration From (including) Up to (excluding)
Zammad Zammad
cpe:2.3:a:zammad:zammad:*:*:*:*:*:*:*:*
6.5.4
Zammad Zammad
cpe:2.3:a:zammad:zammad:7.0.0:*:*:*:*:*:*:*