CVE-2026-21582 Auth bypass in Crowd Data Center
Unauthenticated attackers can perform actions as another user in Crowd Data Center, requiring an upgrade to mitigate.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-21582?
CVE-2026-21582 is a high-severity authentication bypass vulnerability in Atlassian Crowd Data Center, published on 18 Aug 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official 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.
Weakness: CWE-287
Which versions are affected by CVE-2026-21582?
How do I fix CVE-2026-21582?
No fix has been published for CVE-2026-21582 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-21582 being exploited?
There is no known exploitation of CVE-2026-21582 in the wild and no public exploit code.
Sources
Also known as GHSA-vxxr-hxj5-58vp.