CVE-2026-21587
HighCVSS 7.1Exploitation Probability (EPSS)
Low risk26th percentile - higher than 26% of all known CVEs
Summary
A High severity Improper Authorization vulnerability in Jira Service Management Data Center version 11.3.0. An authenticated attacker can gain unintended access, potentially leading to exposure of resources or functionality, and possibly enabling sensitive information disclosure or arbitrary code execution.
Risk Assessment
An authenticated attacker can access sensitive information or execute arbitrary code, posing a serious threat to confidentiality and integrity. This may lead to full compromise of the application.
Recommendation
Upgrade Jira Service Management Data Center to the latest version or at least to 11.3.11.
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Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS

