CVE-2026-21582: BASM (Broken Authentication & Session Management) in Atlassian Crowd Data Center
CVE-2026-21582 is a high severity Broken Authentication and Session Management (BASM) vulnerability in Atlassian Crowd Data Center version 7.2.1. It allows an unauthenticated attacker to perform actions as another user. Atlassian recommends upgrading to version 7.2.2 or later to remediate this issue.
AI Analysis
Technical Summary
CVE-2026-21582 is a BASM vulnerability introduced in Atlassian Crowd Data Center version 7.2.1. The flaw enables an unauthenticated attacker to impersonate another user and perform actions on their behalf. The vulnerability has a CVSS 4.0 base score of 8.8, indicating high severity. Atlassian has addressed this vulnerability in versions 7.2.2 and later. The issue was discovered through Atlassian's Penetration Testing program.
Potential Impact
An unauthenticated attacker can exploit this vulnerability to perform actions as another user, potentially leading to unauthorized access and actions within the affected Crowd Data Center instance. This could compromise user accounts and sensitive operations.
Mitigation Recommendations
Atlassian recommends upgrading affected Crowd Data Center instances from version 7.2.1 to version 7.2.2 or later. Applying this official fix fully mitigates the vulnerability. If immediate upgrade is not possible, follow Atlassian's guidance in their release notes for any temporary measures.
CVE-2026-21582: BASM (Broken Authentication & Session Management) in Atlassian Crowd Data Center
Description
CVE-2026-21582 is a high severity Broken Authentication and Session Management (BASM) vulnerability in Atlassian Crowd Data Center version 7.2.1. It allows an unauthenticated attacker to perform actions as another user. Atlassian recommends upgrading to version 7.2.2 or later to remediate this issue.
CVSS v4.0
Score 8.8high
Affected software
Atlassian
Crowd Data Center
pkg:maven/com.atlassian.crowd/crowd-data-centerRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-21582 is a BASM vulnerability introduced in Atlassian Crowd Data Center version 7.2.1. The flaw enables an unauthenticated attacker to impersonate another user and perform actions on their behalf. The vulnerability has a CVSS 4.0 base score of 8.8, indicating high severity. Atlassian has addressed this vulnerability in versions 7.2.2 and later. The issue was discovered through Atlassian's Penetration Testing program.
Potential Impact
An unauthenticated attacker can exploit this vulnerability to perform actions as another user, potentially leading to unauthorized access and actions within the affected Crowd Data Center instance. This could compromise user accounts and sensitive operations.
Mitigation Recommendations
Atlassian recommends upgrading affected Crowd Data Center instances from version 7.2.1 to version 7.2.2 or later. Applying this official fix fully mitigates the vulnerability. If immediate upgrade is not possible, follow Atlassian's guidance in their release notes for any temporary measures.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- atlassian
- Date Reserved
- 2026-01-01T00:00:40.721Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6a84d72ac6e8be0332ceca03
Added to database: 08/18/2026, 22:05:30 UTC
Last enriched: 09/11/2026, 10:17:42 UTC
Last updated: 10/02/2026, 02:46:03 UTC
Views: 78
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