atlassian confluence CVE-2021-26085 vulnerability in Atlassian Products
Published on August 3, 2021

Affected versions of Atlassian Confluence Server allow remote attackers to view restricted resources via a Pre-Authorization Arbitrary File Read vulnerability in the /s/ endpoint. The affected versions are before version 7.4.10, and from version 7.5.0 before 7.12.3.

Vendor Advisory NVD

Known Exploited Vulnerability

This Atlassian Confluence Server Pre-Authorization Arbitrary File Read Vulnerability is part of CISA's list of Known Exploited Vulnerabilities. Affected versions of Atlassian Confluence Server allow remote attackers to view restricted resources via a pre-authorization arbitrary file read vulnerability in the /s/ endpoint.

The following remediation steps are recommended / required by April 18, 2022: Apply updates per vendor instructions.

Vulnerability Analysis

CVE-2021-26085 can be exploited with network access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. It has the highest possible exploitability rating (3.9). The potential impact of an exploit of this vulnerability is considered to have a small impact on confidentiality, a small impact on integrity and availability.

What is a forced browsing Vulnerability?

The web application does not adequately enforce appropriate authorization on all restricted URLs, scripts, or files. Web applications susceptible to direct request attacks often make the false assumption that such resources can only be reached through a given navigation path and so only apply authorization at certain points in the path.

CVE-2021-26085 has been classified to as a forced browsing vulnerability or weakness.


Products Associated with CVE-2021-26085

You can be notified by stack.watch whenever vulnerabilities like CVE-2021-26085 are published in these products:

Atlassian Confluence
 
Atlassian Confluence Server
 
Atlassian Confluence Data Center
 

What versions are vulnerable to CVE-2021-26085?