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Advisory severityHigh7.1Atlassian Updated

High [CVE-2026-21586] 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 high-severity Atlassian advisory covers CVE-2026-21586 affecting Confluence Data Center.

Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.

CVE-2026-21586 Source published Source updated

VulniPulse record published Record updated

CVE-2026-21586
Affected products & platforms
AtlassianConfluence
Open source advisory

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Summary

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

See the release notes ([ ]).

This vulnerability was reported via our Penetration Testing program.

Affected versions
  • Confluence Data Center 10.2.1 to 10.2.15
  • Confluence Data Center 10.1.0 to 10.1.2
  • Confluence Data Center 10.0.2 to 10.0.3
  • Confluence Data Center 9.5.1 to 9.5.4
  • Confluence Data Center 9.4.0 to 9.4.1
  • Confluence Data Center 9.3.1 to 9.3.2
  • Confluence Data Center 9.2.0 to 9.2.23
  • Confluence Data Center 9.1.1
  • Confluence Data Center 8.9.7 to 8.9.8
  • Confluence Data Center 8.5.16 to 8.5.31
  • Confluence Data Center 7.19.28 to 7.19.30

Official advisory · high-confidence parse· fetched 1 month ago·verify at source

Fixed versions
  • 9.2.24
  • 10.2
  • 10.2.17

Official advisory · high-confidence parse· fetched 1 month ago·verify at source

Mitigation checklist

Recommended fix / mitigation
  • 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]).

Official advisory · high-confidence parse· fetched 1 month ago·verify at source

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