ACTIVELY EXPLOITED
CVE-2021-26085: Atlassian Confluence Server Pre-Authorization Arbitrary File Read Vulnerability
| Vendor | Atlassian |
|---|---|
| Product | Confluence Server |
| Actively exploited | Yes |
| Added to CISA KEV | 28 Mar 2022 |
| CISA federal deadline | 18 Apr 2022 |
| Ransomware use | Known |
| Weakness (CWE) | CWE-425 |
Required action (CISA's text)
Apply updates per vendor instructions.
Description (NVD)
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.
SOURCES
Other Atlassian flaws
- CVE-2026-21589: Atlassian Multiple Products Files or Directories Accessible to External Parties Vulnerability
- CVE-2021-26086: Atlassian Jira Server and Data Center Path Traversal Vulnerability
- CVE-2023-22527: Atlassian Confluence Data Center and Server Template Injection Vulnerability
- CVE-2023-22518: Atlassian Confluence Data Center and Server Improper Authorization Vulnerability
- CVE-2023-22515: Atlassian Confluence Data Center and Server Broken Access Control Vulnerability
Data from NVD, CISA KEV, FIRST EPSS and vendor advisories. Updated 10 Nov 2026.