This High severity File Inclusion vulnerability was introduced in versions 9.0.1, 9.1.0, 9.2.3, and 9.4.0 of Confluence Data Center.

This File Inclusion vulnerability, with a CVSS Score of 8.1 and a CVSS Vector of CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H allows an unauthenticated attacker to get the application to display the contents of a local file, or execute a different files already stored locally on the server which has no impact to confidentiality, high impact to integrity, high impact to availability, and requires user interaction.

Atlassian recommends that Confluence 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:

• Confluence Data Center 9.2: Upgrade to a release greater than or equal to 9.2.5

See the release notes (https://confluence.atlassian.com/doc/confluence-release-notes-327.html). You can download the latest version of Confluence Data Center from the download center (https://www.atlassian.com/software/confluence/download-archives).

The National Vulnerability Database provides the following description for this vulnerability: extract-zip through 2.0.1 containment-checks only the parent directory of each archive entry and never the entry's own final path component, so an archive containing two entries with identical names - a symlink whose target is outside the destination, followed by a regular file - writes through the planted symlink and yields an arbitrary file write outside the destination directory.