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CVE-2026-21587

Quick assessment

Affected
Atlassian Jira Service Management Data Center
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

以下是对该漏洞描述信息的中文翻译： 该高严重性授权不当（Improper Authorization）漏洞是在 Jira Service Management Data Center 11.3.0 版本中引入的。 该授权不当漏洞的 CVSS 评分为 7.1，允许经过身份验证的攻击者获得非预期的访问权限，可能导致资源或功能被暴露，从而可能使攻击者获取敏感信息，甚至执行任意代码。 Atlassian 建议 Jira Service Management Data Center 客户升级至最新版本。如果无法升级至最新版本

CVSS 7.1 · High EPSS 0.32% · P26

Possible ATT&CK Techniques 1 AI

T1078 · Valid Accounts

Affected Version Matrix 2

VendorProduct Version RangeStatus
Atlassian Jira Service Management Data Center 11.3.0 to 11.3.10 affected
11.3.11 unaffected
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I. Basic Information for CVE-2026-21587

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Atlassian Jira Service Management Data Center 11.3.0 to 11.3.10 -

II. Public POCs for CVE-2026-21587

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III. Intelligence Information for CVE-2026-21587

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Vendor Advisories for CVE-2026-21587 (1)

Vendor Pages for CVE-2026-21587 (1)

Same Patch Batch · Atlassian · 2026-09-15 · 3 CVEs total

CVE-2026-21586 7.1 HIGH CVE-2026-21586
CVE-2026-21588 7.1 HIGH CVE-2026-21588

IV. Related Vulnerabilities

Same product: Jira Service Management Data Center
Same vendor: Atlassian

V. Comments for CVE-2026-21587

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