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CVE-2026-21587

HIGH
7.1
CVSS Score
Published: September 15, 2026 at 05:00 PM UTC
Updated: September 17, 2026 at 12:17 PM UTC
1 product affected across 1 vendorJira Service Management

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Severity
HIGH7.1
Exploit prediction
EPSS 0.4%
SSVC
No known exploit

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Jira Service Management· Atlassianatlassian-app
60%
11.3.0 ≤ v ≤ 11.3.10
Vendor states this is fixed in 11.3.11 (unaffected)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (2)

Source: cverecord
https://confluence.atlassian.com/pages/viewpage.action?pageId=1822852209
Source: cverecord
https://jira.atlassian.com/browse/JSDSERVER-16747

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.1HIGHatlassian
Vector?

Quick Info

StatusAWAITING ANALYSIS
CWE
CWE-285

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