CVE-2026-21587 Missing authorization in Jira Service Management Data Center
An authenticated attacker can bypass authorization checks to access sensitive information or execute arbitrary code in Jira Service Management Data Center.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-21587?
CVE-2026-21587 is a high-severity missing authorization vulnerability in Atlassian Jira Service Management Data Center, published on 15 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Weakness: CWE-285
Which versions are affected by CVE-2026-21587?
How do I fix CVE-2026-21587?
No fix has been published for CVE-2026-21587 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-21587 being exploited?
There is no known exploitation of CVE-2026-21587 in the wild and no public exploit code.
Sources
Also known as GHSA-gp6h-7p69-238v.