CVE-2021-26086 vulnerability in Atlassian Products
Published on August 16, 2021

Affected versions of Atlassian Jira Server and Data Center allow remote attackers to read particular files via a path traversal vulnerability in the /WEB-INF/web.xml endpoint. The affected versions are before version 8.5.14, from version 8.6.0 before 8.13.6, and from version 8.14.0 before 8.16.1.

Vendor Advisory NVD

Known Exploited Vulnerability

This Atlassian Jira Server and Data Center Path Traversal Vulnerability is part of CISA's list of Known Exploited Vulnerabilities. Atlassian Jira Server and Data Center contain a path traversal vulnerability that allows a remote attacker to read particular files in the /WEB-INF/web.xml endpoint.

The following remediation steps are recommended / required by December 3, 2024: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

Vulnerability Analysis

CVE-2021-26086 is exploitable 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 Directory traversal Vulnerability?

The software uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the software does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.

CVE-2021-26086 has been classified to as a Directory traversal vulnerability or weakness.

Products Associated with CVE-2021-26086

You can be notified by stack.watch whenever vulnerabilities like CVE-2021-26086 are published in these products:

Atlassian Data Center

Atlassian Jira

Atlassian Jira Data Center

Atlassian Jira Server

What versions are vulnerable to CVE-2021-26086?