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Advisory severityHigh7.1Atlassian Updated

High [CVE-2026-21587] Confluence: This High severity Improper Authorization vulnerability was introduced in version 11.3.0 of Jira Service Management Data Center

This high-severity Atlassian advisory covers CVE-2026-21587 affecting Jira Service Management Data Center.

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

CVE-2026-21587 Source published Source updated

VulniPulse record published Record updated

CVE-2026-21587
Affected products & platforms
AtlassianJira
Open source advisory

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Summary

This High severity Improper Authorization vulnerability was introduced in version 11.3.0 of Jira Service Management 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 Jira Service Management 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:

  • Jira Service Management Data Center 11.3: Upgrade to a release greater than or equal to 11.3.11

See the release notes ( ).

This vulnerability was reported via our Penetration Testing program.

Affected versions
  • Jira Service Management Data Center 11.3.0 to 11.3.10

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

Fixed versions
  • 11.3
  • 11.3.11

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

Mitigation checklist

Recommended fix / mitigation
  • Atlassian recommends that Jira Service Management 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: * Jira Service Management Data Center 11.3: Upgrade to a release greater than or equal to 11.3.11 See the release notes (https://confluence.atlassian.com/servicemanagement/jira-service-management-release-notes-780083086.html).

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

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