UpHeron
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Servers and applications

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. The affected versions are before version 7.4.10, and from version 7.5.0 before 7.12.3.

Actively exploited: CISA added it to its Known Exploited Vulnerabilities catalog on 28 Mar 2022.

Severity
Medium 5.3
Published
3 Aug 2021
Last changed
17 Jun 2026
Added to UpHeron
21 Oct 2026
Fixed in
7.4.10, 7.12.3
Sources
NVD

Affected software

SoftwareAffected versions
ConfluenceServers and applications · cpe:a:atlassian:confluence_data_center
  • Every version before 7.4.10
  • From 7.5.0 before 7.12.3
ConfluenceServers and applications · cpe:a:atlassian:confluence_server
  • Every version before 7.4.10
  • From 7.5.0 before 7.12.3

Known exploited

CISA name
Atlassian Confluence Server Pre-Authorization Arbitrary File Read Vulnerability
Required action
Apply updates per vendor instructions.
Due for US agencies
18 Apr 2022
Used in ransomware
Yes, known

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2021-26085
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2021-26085