Atlassian Confluence - Arbitrary File Read (CVE-2021-26085)

Atlassian Confluence is affected by a Pre-Authorization Arbitrary File Read vulnerability in the /s/ endpoint. This allows attackers to read sensitive information from the target system by sending a special crafted HTTP GET request to the vulnerable endpoint. The affected endpoints are /WEB-INF/web.xml, /WEB-INF/decorators.xml, /WEB-INF/classes/seraph-config.xml, META-INF/maven/com.atlassian.confluence/confluence-webapp/pom.xml and META-INF/maven/com.atlassian.confluence/confluence-webapp/pom.properties.

The risk exists that a remote unauthenticated attacker could exploit this vulnerability to read sensitive information from arbitrary files located on the file system of the server.

Sniper can read arbitrary files from the target system and extract them as evidence.

Upgrade the Atlassian Confluence to the latest version.

https://nvd.nist.gov/vuln/detail/CVE-2021-26085

https://jira.atlassian.com/browse/CONFSERVER-67893?src=confmacro