CVE-2020-26030

CRITICAL

Zammad < 3.4.1 - Authentication Bypass via SSO Endpoint Header

Title source: llm
STIX 2.1

Description

An issue was discovered in Zammad before 3.4.1. There is an authentication bypass in the SSO endpoint via a crafted header, when SSO is not configured. An attacker can create a valid and authenticated session that can be used to perform any actions in the name of other users.

References (1)

Core 1
Core References

Scores

CVSS v3 9.8
EPSS 0.0133
EPSS Percentile 67.6%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Details

CWE
CWE-287
Status published
Products (1)
zammad/zammad 1.0.0 - 3.4.1
Published Dec 28, 2020
Tracked Since Feb 18, 2026