What’s Vulnerable › Vulnerabilities

CVE-2021-26085: Atlassian Confluence Server Pre-Authorization Arbitrary File Read Vulnerability

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: yes — in CISA KEV since 2022-03-28
• EPSS: 99.9% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-08-03 · updated 2026-06-17
• Weakness: CWE-425

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

• Atlassian Confluence Data Center: before 7.4.10; from 7.5.0 before 7.12.3 — fixed in 7.12.3, 7.4.10
• Atlassian Confluence Data Center: before 7.4.10; from 7.5.0 before 7.12.3 — fixed in 7.12.3, 7.4.10

How to fix

Upgrade to a fixed version: Atlassian Confluence Data Center 7.12.3, 7.4.10; Atlassian Confluence Data Center 7.12.3, 7.4.10. Check the vendor advisory for mitigations.

References

• http://packetstormsecurity.com/files/164401/Atlassian-Confluence-Server-7.5.1-Arbitrary-File-Read.html
• https://jira.atlassian.com/browse/CONFSERVER-67893
• http://packetstormsecurity.com/files/164401/Atlassian-Confluence-Server-7.5.1-Arbitrary-File-Read.html
• https://jira.atlassian.com/browse/CONFSERVER-67893
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-26085

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