The remote Confluence server is affected by a cross-site scripting (XSS) vulnerability.
Versions of Confluence 5.1.x prior to 5.1.1 contain a flaw that allows a reflected XSS attack. This flaw exists because the 'managereferrers.vm' script does not validate input to the 'justAdded' parameter before returning it to users. This may allow a context-dependent attacker to create a specially crafted request that would execute arbitrary script code in a user's browser session within the trust relationship between their browser and the server.
Upgrade to Confluence 5.1.x version 5.1.1 or later.