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.
Metrics
Affected Vendors & Products
No advisories yet.
Solution
No solution given by the vendor.
Workaround
No workaround given by the vendor.
Thu, 20 Aug 2026 19:30:00 +0000
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|---|---|---|
| Metrics |
ssvc
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Wed, 19 Aug 2026 13:45:00 +0000
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| First Time appeared |
Atlassian
Atlassian crowd Data Center |
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| Vendors & Products |
Atlassian
Atlassian crowd Data Center |
Wed, 19 Aug 2026 10:00:00 +0000
| Type | Values Removed | Values Added |
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| Title | Unauthenticated User Impersonation in Atlassian Crowd Data Center | |
| Weaknesses | CWE-287 |
Tue, 18 Aug 2026 22:15:00 +0000
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| 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 |
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| Metrics |
cvssV4_0
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Projects
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Status: PUBLISHED
Assigner: atlassian
Published:
Updated: 2026-08-20T18:34:02.178Z
Reserved: 2026-01-01T00:00:40.721Z
Link: CVE-2026-21582
Updated: 2026-08-20T18:30:40.946Z
Status : Received
Published: 2026-08-18T22:16:50.340
Modified: 2026-08-20T19:16:51.860
Link: CVE-2026-21582
No data.
OpenCVE Enrichment
Updated: 2026-08-19T13:30:04Z