CVE-2021-42137 Missing authorization in n/a

What is CVE-2021-42137?

CVE-2021-42137 is a medium-severity missing authorization vulnerability in Zammad Zammad, published on 11 Oct 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

An issue was discovered in Zammad before 5.0.1. In some cases, there is improper enforcement of the privilege requirement for viewing a list of tickets that shows title, state, etc.

Weakness: CWE-863

Which versions are affected by CVE-2021-42137?

It affects 1 product.

Products include Zammad Zammad.

How do I fix CVE-2021-42137?

No fix has been published for CVE-2021-42137 yet. Limit exposure of the affected software until one is available.

Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.

Is CVE-2021-42137 being exploited?

There is no known exploitation of CVE-2021-42137 in the wild and no public exploit code.

Other vulnerabilities in Zammad Zammad

• CVE-2026-102489 Zammad GmbH Zammad Session Fixation Exploited High 8.7
• CVE-2026-102490 Zammad GmbH Zammad Improper Privilege Management Exploited High 8.5
• CVE-2022-48021 Code injection in n/a Critical 9.8
• CVE-2022-35490 Security feature bypass in n/a Critical 9.8
• CVE-2021-42090 Deserialization in n/a Critical 9.8

All Zammad Zammad vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-8r2j-p454-pcgc.