# CVE-2026-21587

> CVE-2026-21587. CVSS 7.1 (CVSS 4.0).

Canonical: https://rewindex.com/cve/CVE-2026-21587
Last updated: 2026-09-17T12:17:31Z

- Published: 2026-09-15 17:00 UTC · Updated: 2026-09-17 12:17 UTC · Assigner: atlassian
- CVSS: 7.1 (CVSS 4.0) · Severity: High
- EPSS: 0.44%, 38th percentile (scored 2026-10-25)
- CISA KEV: no

## 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.

## Affected vendors and products

- Atlassian: Jira Service Management Data Center

## Tracked companies

- [Jira](https://rewindex.com/company/jira.md)

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2026-21587)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2026-21587)
- [https://confluence.atlassian.com/pages/viewpage.action?pageId=1822852209](https://confluence.atlassian.com/pages/viewpage.action?pageId=1822852209)
- [https://jira.atlassian.com/browse/JSDSERVER-16747](https://jira.atlassian.com/browse/JSDSERVER-16747)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2026-21587 · Markdown: https://rewindex.com/cve/CVE-2026-21587.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-21587 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T02:15:18.693Z