CVE-2021-43956

Severity: medium (CVSS 6.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.7% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2022-03-16 · updated 2026-06-17
Weakness: CWE-1321

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.

Affected products

Atlassian Crucible: before 4.8.9 — fixed in 4.8.9
Atlassian Fisheye: before 4.8.9 — fixed in 4.8.9

How to fix

Upgrade to a fixed version: Atlassian Crucible 4.8.9; Atlassian Fisheye 4.8.9. Check the vendor advisory for mitigations.

References

https://jira.atlassian.com/browse/CRUC-8531
https://jira.atlassian.com/browse/FE-7395
https://jira.atlassian.com/browse/CRUC-8531
https://jira.atlassian.com/browse/FE-7395

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