Atlassian Confluence Server Pre-Authorization Arbitrary File Read Vulnerability (CVE-2021-26085)
Severity: medium · Patch status: patched · Since 2022-03-28 · CVE-2021-26085
Affected versions of Atlassian Confluence Server allow remote attackers to view restricted resources via a pre-authorization arbitrary file read vulnerability in the /s/ endpoint. CISA added CVE-2021-26085 to its Known Exploited Vulnerabilities catalog on Mar 28, 2022, which means attackers are exploiting it in the wild. CISA reports known use in ransomware campaigns.
What to do
- Apply updates per vendor instructions.
- US federal agencies must remediate by Apr 18, 2022 (BOD 22-01); treat that as the outer limit.
Sources
All live incidents on Threat Watch
