Francesco "aScii" Ongaro has discovered a vulnerability in PmWiki, which can be exploited by malicious people to bypass certain security restrictions, conduct cross-site scripting attacks, disclose sensitive information, and compromise a vulnerable system.
The vulnerability is caused due to an error in the unregister "register_globals" layer in the handling of the "GLOBALS" array parameter. This can e.g. be exploited to include arbitrary files from external and local resources, and execute arbitrary HTML and script code in a user's browser session in context of an affected site.
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