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 affecting 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 unauthenticated attackers to impersonate other users 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 issue in version 7.2.2 and later releases. The vulnerability 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 manipulation of data or system functions within Crowd Data Center. This could compromise the integrity and confidentiality of the affected system.
Mitigation Recommendations
Atlassian recommends upgrading Crowd Data Center to version 7.2.2 or any later release to remediate this vulnerability. If immediate upgrade is not possible, customers should prioritize planning the upgrade to a fixed version as soon as feasible. No other mitigations or temporary fixes are specified.
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 affecting 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
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.
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 unauthenticated attackers to impersonate other users 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 issue in version 7.2.2 and later releases. The vulnerability 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 manipulation of data or system functions within Crowd Data Center. This could compromise the integrity and confidentiality of the affected system.
Mitigation Recommendations
Atlassian recommends upgrading Crowd Data Center to version 7.2.2 or any later release to remediate this vulnerability. If immediate upgrade is not possible, customers should prioritize planning the upgrade to a fixed version as soon as feasible. No other mitigations or temporary fixes are specified.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- atlassian
- Date Reserved
- 2026-01-01T00:00:40.721Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a84d72ac6e8be0332ceca03
Added to database: 08/18/2026, 22:05:30 UTC
Last enriched: 08/18/2026, 22:19:29 UTC
Last updated: 08/18/2026, 22:55:39 UTC
Views: 7
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