Atlassian Confluence Server
YES - ON THE CISA KEV LIST
CVE-2021-26085
Atlassian Confluence Server Pre-Authorization Arbitrary File Read Vulnerability
overdue since 2022-04-18
Atlassian: 14 entries (0.8% of all KEV entries are from this vendor); 1 added in 2026.
BOD 26-04 note: this is the date printed in the CISA catalog. A federal agency's actual deadline is set by its SSVC tier - Act (3 days), Attend (14 days), Track (60 days), or the next scheduled upgrade - counted from the KEV listing date or the date the vulnerability is identified in its environment, whichever comes first. Use the tier helper on each CVE page for your own window.
Your BOD 26-04 window (SSVC tier helper)
Your remediation window ends:
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.
Required action (CISA)
Apply updates per vendor instructions.
Notes
https://nvd.nist.gov/vuln/detail/CVE-2021-26085
References
Other KEV entries for this vendor: Atlassian
- CVE-2026-21589 - Multiple Products (2026-10-15)
- CVE-2021-26086 - Jira Server and Data Center (2024-11-12)
- CVE-2023-22527 - Confluence Data Center and Server (2024-01-24)
- CVE-2023-22518 - Confluence Data Center and Server (2023-11-07)
- CVE-2023-22515 - Confluence Data Center and Server (2023-10-05)
- CVE-2022-36804 - Bitbucket Server and Data Center (2022-09-30)
- CVE-2022-26138 - Confluence (2022-07-29)
- CVE-2022-26134 - Confluence Server/Data Center (2022-06-02)
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