CVE-2021-35303 Cross-site scripting in n/a

What is CVE-2021-35303?

CVE-2021-35303 is a medium-severity cross-site scripting vulnerability in Zammad Zammad, published on 28 Jun 2021. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

Official description

Cross Site Scripting (XSS) in Zammad 1.0.x up to 4.0.0 allows remote attackers to execute arbitrary web script or HTML via the User Avatar attribute.

Weakness: CWE-79

Which versions are affected by CVE-2021-35303?

It affects 1 product.

Products include Zammad Zammad.

How do I fix CVE-2021-35303?

No fix has been published for CVE-2021-35303 yet. Limit exposure of the affected software until one is available.

Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.

Is CVE-2021-35303 being exploited?

There is no known exploitation of CVE-2021-35303 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-hwv7-wjc3-wjwc.