Threat intelligence dashboard
CVE-2026-21587high

Vulnerability record

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.

Risk score

7.1

CVSS 4.0

Vendor
Atlassian
Product
Jira Service Management Data Center
CWE
CWE-285
Published
Sep 15, 2026
Updated
Sep 16, 2026
CISA KEV
Not flagged

Affected products and versions

Jira Service Management Data Center

Atlassian

Version / rangeStatusType
11.3.0 to 11.3.10affected
11.3.11unaffected

Technical metrics

7.1

CVSS 4.0

Severity
high
Source
atlassian
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