CVE-2026-21587

Improper Authorization Allows Authenticated User Unauthorized Access in Atlassian Jira Service Management Data Center 11.3.0-11.3.10

Published Sep 15, 2026 CVSS 4.0 · 7.1 High EPSS < 1% KEV · Not listed
Description
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 (https://confluence.atlassian.com/servicemanagement/jira-service-management-release-notes-780083086.html). You can download the latest version of Jira Service Management Data Center from the download center (https://www.atlassian.com/software/jira/service-management/download-archives).

This vulnerability was reported via our Penetration Testing program.

Remediation

No solution or workaround provided in the CVE record

Tracking

Sign in to view the affected projects.

Advisories

No advisories available
History
Type Values Removed Values Added
First Time appeared Atlassian
Atlassian jira Service Management Data Center
Vendors & Products Atlassian
Atlassian jira Service Management Data Center
Type Values Removed Values Added
Title Improper Authorization Allows Authenticated User Unauthorized Access in Atlassian Jira Service Management Data Center 11.3.0-11.3.10
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
Title Improper Authorization in Atlassian Jira Service Management Data Center Allows Elevated Access
Type Values Removed Values Added
Title Improper Authorization in Atlassian Jira Service Management Data Center Allows Elevated Access
Type Values Removed Values Added
Weaknesses CWE-285
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description 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 (https://confluence.atlassian.com/servicemanagement/jira-service-management-release-notes-780083086.html). You can download the latest version of Jira Service Management Data Center from the download center (https://www.atlassian.com/software/jira/service-management/download-archives). This vulnerability was reported via our Penetration Testing program.
References
Metrics cvssV4_0

{'score': 7.1, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
atlassian
Published
Updated
Sep 17, 2026, 11:58 AM
Reserved
Jan 1, 2026, 12:00 AM
Status
Awaiting Analysis
Published
Sep 15, 2026, 5:17 PM
Modified
Sep 17, 2026, 12:17 PM