How severe is CVE-2021-26085?

CVE-2021-26085 has a CVSS 3.1 base score of 5.3 (MEDIUM). EPSS estimates a 99.9% probability of exploitation in the next 30 days. It is listed in the CISA Known Exploited Vulnerabilities catalog.

CVE-2021-26085: Atlassian Confluence Server Pre-Authorization

CISA Known Exploited Vulnerabilities

Atlassian Confluence Server Pre-Authorization Arbitrary File Read Vulnerability is confirmed as actively exploited and is listed in the CISA KEV catalog.

Added to KEV

2022-03-28

Remediation due

2022-04-18

Ransomware

Known use

Required action
Apply updates per vendor instructions.

CISA notes
https://nvd.nist.gov/vuln/detail/CVE-2021-26085

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.

Severity

CVSS 3.1 · CISA5.3 MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

SSVC · CISA-ADP

Exploitationactive

Automatableyes

Technical impactpartial

Affected Products

Vendor	Product	Affected versions
Atlassian	Confluence Server	unspecified to <7.4.10 7.5.0 to <unspecified unspecified to <7.12.3
Atlassian	Confluence Data Center	unspecified to <7.4.10 7.5.0 to <unspecified unspecified to <7.12.3

References

2 Links

Other references

Record Details

Published

2021-08-03

Last updated

2025-10-21

Assigner (CNA)

atlassian

Credited to

More from Atlassian

All Atlassian CVEs→

CVE-2023-2251810 CRITICAL

Atlassian Confluence Data Center and Server Improper Authorization Vulnerability

AtlassianKEVEPSS 100.0%2023-10-31

CVE-2021-260849.8 CRITICAL

Atlassian Confluence Server and Data Center Object-Graph Navigation Language (OGNL) Injection Vulnerability

AtlassianKEVEPSS 100.0%2021-08-30

CVE-2022-261349.8 CRITICAL

Atlassian Confluence Server and Data Center Remote Code Execution Vulnerability

AtlassianKEVEPSS 100.0%2022-06-03

CVE-2021-260865.3 MEDIUM

Atlassian Jira Server and Data Center Path Traversal Vulnerability

AtlassianKEVEPSS 100.0%2021-08-16

CVE record data © The MITRE Corporation, used under the CVE Terms of Use. Exploited-in-the-wild data from the CISA Known Exploited Vulnerabilities catalog (CC0). Exploit prediction scores by FIRST EPSS (first.org/epss). This site is not endorsed or certified by MITRE, NVD, CISA, or FIRST.