What is CVE-2020-26030?

CVE-2020-26030 is a critical-severity vulnerability in Zammad, classified under Improper Authentication. CVSS score: 9.8/10. Published 2020-12-28.

How severe is CVE-2020-26030?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Auth bypass in Zammad

CVE-2020-26030

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.

Vulnerability class: Broken Authentication

EPSS: 0.013 (68.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Zammad
N/a — versions n/a

Weakness classification (CWE)

CWE-287 — Improper Authentication

References

cve@mitre.org (x_refsource_MISC, Vendor Advisory)

Frequently asked questions

What is CVE-2020-26030?: CVE-2020-26030 is a critical-severity vulnerability in Zammad, classified under Improper Authentication. CVSS score: 9.8/10. Published 2020-12-28.
How severe is CVE-2020-26030?: Critical severity. CVSS v3 base score is 9.8 out of 10.