CVE-2021-43956 Cross-site scripting in Crucible

What is CVE-2021-43956?

CVE-2021-43956 is a medium-severity cross-site scripting vulnerability in Atlassian Crucible, published on 16 Mar 2022. 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

The jQuery deserialize library in Fisheye and Crucible before version 4.8.9 allowed remote attackers to to inject arbitrary HTML and/or JavaScript via a prototype pollution vulnerability.

Weakness: CWE-1321

Which versions are affected by CVE-2021-43956?

It affects 2 products.

Products include Atlassian Crucible, Atlassian Fisheye.

How do I fix CVE-2021-43956?

No fix has been published for CVE-2021-43956 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-2021-43956 being exploited?

There is no known exploitation of CVE-2021-43956 in the wild and no public exploit code.

Other vulnerabilities in Atlassian Crucible

• CVE-2021-43958 Security feature bypass in Crucible Critical 9.8
• CVE-2017-16861 Code injection in Fisheye and Crucible Critical 9.8
• CVE-2017-14591 Command injection in Fisheye and Crucible Critical 9.0
• CVE-2020-4018 Cross-site request forgery in Crucible High 8.8
• CVE-2018-13399 Privilege escalation in Fisheye and Crucible High 7.8

All Atlassian Crucible vulnerabilities

Sources

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

Also known as GHSA-9p4g-cjcf-q3x2.