CVE-2021-43958: Atlassian Crucible

Critical severity, CVSS 9.8. EPSS: 1.5% chance of exploitation in the next 30 days.

Various rest resources in Fisheye and Crucible before version 4.8.9 allowed remote attackers to brute force user login credentials as rest resources did not check if users were beyond their max failed login limits and therefore required solving a CAPTCHA in addition to providing user credentials for authentication via a improper restriction of excess authentication attempts 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)

Published 2022-03-16. Last modified 2026-06-17.