Atlassian Confluence - Remote Code Execution (CVE-2021-26084)

Atlassian Confluence is affected by a Remote Code Execution, located on the createpage-entervariables.action endpoint. Versions lower than 7.12.5 are vulnerable to this OGNL Injection vulnerability. This allows a malicious user to execute arbitrary code on the server.

Sniper can gain unauthenticated Remote Code Execution on the target system and extract multiple artefacts as evidence.

The risk exists that a remote unauthenticated attacker can fully compromise the Confluence Server in order to steal confidential information, install ransomware or pivot to the internal network.

Upgrade the Confluence server to a version higher than 7.12.5.

https://nvd.nist.gov/vuln/detail/CVE-2021-26084

https://confluence.atlassian.com/doc/confluence-security-advisory-2021-08-25-1077906215.html