Confluence Data Center Improper Auth Vulnerability (v7.4.010.2.0)
CVE-2026-21586 Published on September 15, 2026
This High severity Improper Authorization vulnerability was introduced in versions 7.4.0, 7.13.0, 8.5.0, 8.9.0, 9.0.1, 9.1.0, 9.2.0, 9.3.1, 9.4.0, 9.5.1, 10.0.2, 10.1.0, and 10.2.0 of Confluence Data Center. This Improper Authorization vulnerability, with a CVSS Score of 7.1, allows an authenticated attacker to gain unintended access and can lead to the exposure of resources or functionality, possibly providing attackers with sensitive information or even execute arbitrary code. Atlassian recommends that Confluence Data Center customers upgrade to latest version, if you are unable to do so, upgrade your instance to one of the specified supported fixed versions: Confluence Data Center 9.2: Upgrade to a release greater than or equal to 9.2.24 Confluence Data Center 10.2: Upgrade to a release greater than or equal to 10.2.17 See the release notes ([https://confluence.atlassian.com/doc/confluence-release-notes-327.html]). You can download the latest version of Confluence Data Center from the download center ([https://www.atlassian.com/software/confluence/download-archives]). This vulnerability was reported via our Penetration Testing program.
Weakness Type
What is an AuthZ Vulnerability?
The software does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action.
CVE-2026-21586 has been classified to as an AuthZ vulnerability or weakness.
Products Associated with CVE-2026-21586
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Affected Versions
Atlassian Confluence Data Center:- Version 10.2.1 to 10.2.15 is affected.
- Version 10.1.0 to 10.1.2 is affected.
- Version 10.0.2 to 10.0.3 is affected.
- Version 9.5.1 to 9.5.4 is affected.
- Version 9.4.0 to 9.4.1 is affected.
- Version 9.3.1 to 9.3.2 is affected.
- Version 9.2.0 to 9.2.23 is affected.
- Version 9.1.1 is affected.
- Version 8.9.7 to 8.9.8 is affected.
- Version 8.5.16 to 8.5.31 is affected.
- Version 7.19.28 to 7.19.30 is affected.
- Version 10.2.17 to 10.2.18 is unaffected.
- Version 9.2.24 to 9.2.25 is unaffected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.