Description
This High severity BASM (Broken Authentication & Session Management) vulnerability known as CVE-2026-21582 was introduced in version 7.2.1 of Crowd Data Center.

This BASM (Broken Authentication & Session Management) vulnerability, with a CVSS Score of 8.8, allows an unauthenticated attacker to perform actions as another user.

Atlassian recommends that Crowd 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:

Crowd Data Center 7.2: Upgrade to a release greater than or equal to 7.2.2



See the release notes (https://confluence.atlassian.com/crowd/crowd-release-notes-199094.html). You can download the latest version of Crowd Data Center from the download center (https://www.atlassian.com/software/crowd/download-archive).

This vulnerability was reported via our Penetration Testing program.
Published: 2026-08-18
Score: 8.8 High
EPSS: n/a
KEV: No
Impact: n/a
Action: n/a
AI Analysis

Analysis and contextual insights are available on OpenCVE Cloud.

Remediation

No vendor fix or workaround currently provided.

Additional remediation guidance may be available on OpenCVE Cloud.

Tracking

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Advisories

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History

Wed, 19 Aug 2026 10:00:00 +0000

Type Values Removed Values Added
Title Unauthenticated User Impersonation in Atlassian Crowd Data Center
Weaknesses CWE-287

Tue, 18 Aug 2026 22:15:00 +0000

Type Values Removed Values Added
Description This High severity BASM (Broken Authentication & Session Management) vulnerability known as CVE-2026-21582 was introduced in version 7.2.1 of Crowd Data Center. This BASM (Broken Authentication & Session Management) vulnerability, with a CVSS Score of 8.8, allows an unauthenticated attacker to perform actions as another user. Atlassian recommends that Crowd 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: Crowd Data Center 7.2: Upgrade to a release greater than or equal to 7.2.2 See the release notes (https://confluence.atlassian.com/crowd/crowd-release-notes-199094.html). You can download the latest version of Crowd Data Center from the download center (https://www.atlassian.com/software/crowd/download-archive). This vulnerability was reported via our Penetration Testing program.
References
Metrics cvssV4_0

{'score': 8.8, 'vector': 'CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:P/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N'}

Subscriptions

No data.

cve-icon MITRE

Status: PUBLISHED

Assigner: atlassian

Published:

Updated: 2026-08-18T22:00:00.412Z

Reserved: 2026-01-01T00:00:40.721Z

Link: CVE-2026-21582

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-08-18T22:16:50.340

Modified: 2026-08-18T22:16:50.340

Link: CVE-2026-21582

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-08-19T09:45:03Z

Weaknesses