Alert status CRITICAL Background / What has happened? On June 3 2022, Atlassian published a security advisory regarding a critical unauthenticated remote code execution (RCE) vulnerability (CVE-2022-26134) in all supported versions of Atlassian Confluence Server and Data Center. Exploitation of this RCE vulnerability could allow a malicious actor to remotely install malware or otherwise control the affected device without authentication. The ACSC is aware of malicious actors successfully exploiting the vulnerability prior to Atlassian’s disclosure, however at this time the ACSC is not aware of successful exploitation within Australia. Mitigation / How do I stay secure? Atlassian has released version updates (7.4.17, 7.13.7, 7.14.3, 7.15.2, 7.16.4, 7.17.4 and 7.18.1) to fix the vulnerability. Atlassian recommends vendors upgrade Confluence immediately. The ACSC recommends Atlassian Confluence Server and Data Center users continue to monitor the Atlassian website for updates as well as future vulnerabilities. Assistance / Where can I go for help? The ACSC is monitoring the situation and is able to provide assistance and advice as required. Organisations that have been impacted or require assistance can contact the ACSC via 1300 CYBER1 (1300 292 371).