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High7.1Atlassian

High [CVE-2026-21577] This High severity DoS (Denial of Service) vulnerability was introduced in versions 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-2026-21577 affecting Confluence Data Center.

CVE-2026-21577 Published Jul 21, 2026Updated by vendor Aug 10, 2026
CVE-2026-21577
Affected products & platforms
AtlassianConfluence
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Summary

This High severity DoS (Denial of Service) vulnerability was introduced in versions 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 DoS (Denial of Service) vulnerability, with a CVSS Score of 7.1, allows an authenticated attacker to cause a resource to be unavailable for its intended users by temporarily or indefinitely disrupting services of a host connected to a network.

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 9.2.17

See the release notes ([ ]).

This vulnerability was reported via our Penetration Testing program.

Affected versions
  • Confluence Data Center 10.2.0 to 10.2.6
  • 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 9.2.15
  • Confluence Data Center 9.1.0 to 9.1.1
  • Confluence Data Center 9.0.1 to 9.0.3

Official advisory · high-confidence parse· fetched 2 months ago·verify at source

Fixed versions
  • 9.2.17
  • 10.2
  • 10.2.7

Official advisory · high-confidence parse· fetched 2 months 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 9.2.17 Confluence Data Center 10.2: Upgrade to a release greater than or equal to 10.2.7 See the release notes ([https://confluence.atlassian.com/doc/confluence-release-notes-327.html]).

Official advisory · high-confidence parse· fetched 2 months ago·verify at source

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