Actively exploited · Published Aug 3, 2021 · Assigned by atlassian
CVE-2021-26085
Medium 5.3 Exploited Ransomware
In plain English
A medium-severity security flaw in Confluence Data Center from Atlassian. Attackers are actively exploiting it in the wild (listed by CISA on March 28, 2022). It has been used in ransomware campaigns. The chance it is exploited in the next 30 days is estimated at 99.9% (higher than 99.9% of all known vulnerabilities). Ready-made attack tooling exists: Nuclei, public proof-of-concept code. Apply updates per vendor instructions.
CISA guidance
Apply updates per vendor instructions.
Federal agencies must remediate by Apr 18, 2022.
Official description
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. The affected versions are before version 7.4.10, and from version 7.5.0 before 7.12.3.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Atlassian | Confluence Server | unspecified – before 7.4.107.5.0 – before unspecifiedunspecified – before 7.12.3 |
| Atlassian | Confluence Data Center | unspecified – before 7.4.107.5.0 – before unspecifiedunspecified – before 7.12.3 |
Weakness: CWE-425 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N