CVE-2026-21582: Atlassian Crowd Data Center vulnerability
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.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
Atlassian Crowd Data Centerto a version that resolves this vulnerability.Fixed in 7.2.2
Event History
Frequently Asked Questions
Which Crowd Data Center deployments are affected?
The vulnerability was introduced in Crowd Data Center version 7.2.1. The provided remediation guidance identifies the fixed 7.2 release line as version 7.2.2 or later.
Does exploitation require an authenticated account?
No. An unauthenticated attacker can exploit the issue to perform actions as another user.
What should teams do if they cannot immediately upgrade to the latest release?
Upgrade Crowd Data Center 7.2 deployments to version 7.2.2 or a later supported fixed release. The provided information does not describe a workaround or configuration-based mitigation.