High Severity Stored XSS Vulnerability Patched in Atlassian Confluence

CVSScvssV3_0: 8.5

A high severity cross-site scripting (XSS) vulnerability was discovered in Atlassian Confluence that could allow attackers to execute malicious scripts on users’ browsers.

Confluence is a popular enterprise collaboration and documentation tool. The vulnerability affected versions between 2.7.0 to the latest version at the time and had a CVSS score of 8.5 out of 10, indicating a high risk.

Stored XSS vulnerabilities occur when untrusted data is saved to and then displayed from a database without being sanitized. In Confluence, an authenticated attacker could craft a malicious HTML or JavaScript payload and store it in the application. When other users viewed the content, their browsers would execute the script from the Confluence server.

This could allow the attacker to steal users’ login cookies or other sensitive information, use the browser to perform actions on the attacker’s behalf, or redirect users to malicious sites. No user interaction would be required once the script is stored.

Atlassian has released patches for all affected versions of Confluence. Users are strongly recommended to upgrade immediately to the latest version or supported fixed release listed for their installation. Regularly applying security updates is also important to protect against vulnerabilities like this.

By keeping software updated with the latest patches, users can help prevent the exploitation of vulnerabilities and ensure the security of their data and systems.