Is CVE-2020-26030 actively exploited?

No active exploitation of CVE-2020-26030 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2020-26030 be exploited remotely?

Yes. CVE-2020-26030 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2020-26030?

CVE-2020-26030 has a CVSS score of 9.8 (CRITICAL).

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CRITICAL

CVE-2020-26030

CWE-287Published: December 28, 2020· Updated: Jun 17, 2026

9.8

CVSS v3.1

Official 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.

NVD Source

Technical Analysis

CVE-2020-26030 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.

From a weakness classification perspective (CWE-287): Authentication bypass vulnerabilities allow attackers to access protected resources without valid credentials.