CVE-2026-21577

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

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]). 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.

Affected Software

VendorProductVersion RangeStatus
AtlassianConfluence Data Center10.2.0 to 10.2.6affected
AtlassianConfluence Data Center10.1.0 to 10.1.2affected
AtlassianConfluence Data Center10.0.2 to 10.0.3affected
AtlassianConfluence Data Center9.5.1 to 9.5.4affected
AtlassianConfluence Data Center9.4.0 to 9.4.1affected
AtlassianConfluence Data Center9.3.1 to 9.3.2affected
AtlassianConfluence Data Center9.2.0 to 9.2.15affected
AtlassianConfluence Data Center9.1.0 to 9.1.1affected
AtlassianConfluence Data Center9.0.1 to 9.0.3affected
AtlassianConfluence Data Center10.2.7 to 10.2.14unaffected
AtlassianConfluence Data Center9.2.17 to 9.2.22unaffected

Weaknesses

  • DoS (Denial of Service)

References