---
id: CVE-2026-21587
title: >-
  This High severity Improper Authorization vulnerability was introduced in
  version 11.3.0 of Jira Service Management Data Center
summary: "This High severity Improper Authorization vulnerability was introduced in version 11.3.0 of Jira Service Management Data Center. \n\t\n\tThis Improper Authorization vulnerability, with a CVSS Score of 7.1, allows an authenticated attacker to…"
severity: high
cvss: 7.1
cvssVector: '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'
cwe:
  - CWE-285
vendor: Atlassian
product: Jira Service Management Data Center
affected:
  - jira_service_management_data_center 11.3.0 to 11.3.10
published: '2026-09-15'
updated: '2026-09-17'
sourceUpdated: '2026-09-17T12:17:31.640'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-21587'
references:
  - url: 'https://confluence.atlassian.com/pages/viewpage.action?pageId=1822852209'
    label: security@atlassian.com
  - url: 'https://jira.atlassian.com/browse/JSDSERVER-16747'
    label: security@atlassian.com
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-09-16T03:56:46.647669Z'
cvssSource: cna
epss: 0.00324
epssPercentile: 0.22744
ingestedAt: '2026-09-15T17:41:02.861Z'
---

## Overview

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

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.