CVE-2021-43940: Atlassian Confluence Data Center

High severity, CVSS 7.8. EPSS: 0.3% chance of exploitation in the next 30 days.

Affected versions of Atlassian Confluence Server and Data Center allow authenticated local attackers to achieve elevated privileges on the local system via a DLL Hijacking vulnerability in the Confluence installer. This vulnerability only affects installations of Confluence Server and Data Center on Windows. The affected versions are before version 7.4.10, and from version 7.5.0 before 7.12.3.

Affected products

• Atlassian Confluence Data Center: before 7.4.10 (fixed in 7.4.10); from 7.5.0, before 7.12.3 (fixed in 7.12.3)
• Atlassian Confluence Server: before 7.4.10 (fixed in 7.4.10); from 7.5.0, before 7.12.3 (fixed in 7.12.3)

Published 2022-02-15. Last modified 2026-06-17.