This is a vulnerability in a non-Atlassian Bitbucket dependency. Atlassian's application of this dependency presents a lower, non-critical assessed risk.

This Critical severity RCE (Remote Code Execution) vulnerability was introduced in version 10.3.0 of Bitbucket Data Center.

This RCE (Remote Code Execution) vulnerability, with a CVSS Score of 9.8 and a CVSS Vector of CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H allows an unauthenticated attacker to execute arbitrary code which has high impact to confidentiality, high impact to integrity, high 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 10.3.2

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: Prototype pollution vulnerability in 'getobject' version 0.1.0 allows an attacker to cause a denial of service and may lead to remote code execution.