This High severity BASM (Broken Authentication & Session Management) vulnerability was introduced in versions 10.0.0, 10.1.3, 10.2.0, and 10.3.0 of Bitbucket Data Center.

This BASM (Broken Authentication & Session Management) vulnerability, with a CVSS Score of 8.2 and a CVSS Vector of CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N allows an unauthenticated attacker to perform actions as another user which has high impact to confidentiality, low impact to integrity, no impact to availability, and requires no user interaction.

Atlassian recommends that Bitbucket 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:

• Bitbucket Data Center 10.3: Upgrade to a release greater than or equal to 10.3.1
• Bitbucket Data Center 10.2: Upgrade to a release greater than or equal to 10.2.4

See the release notes (https://confluence.atlassian.com/bitbucketserver/release-notes). You can download the latest version of Bitbucket Data Center from the download center (https://www.atlassian.com/software/bitbucket/download-archives).

The National Vulnerability Database provides the following description for this vulnerability: Spring Boot applications with Actuator can be vulnerable to an "Authentication Bypass" vulnerability when an application endpoint that requires authentication is declared under a specific path, already configured for a Health Group additional path.
This issue affects Spring Boot: from 4.0 before 4.0.3, from 3.5 before 3.5.11, from 3.4 before 3.4.15.
This CVE is similar but not equivalent to CVE-2026-22733, as the conditions for exploit and vulnerable versions are different.