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CVE-2017-16651 is a file disclosure vulnerability in Roundcube Webmail versions 1.1.0 through 1.3.2. The flaw arises from insufficient sanitization of the _timezone parameter in the login form, which can be manipulated by an authenticated attacker to reference arbitrary files on the host filesystem. The vulnerability is exploited via crafted requests to the _task=settings&_action=upload-display&_from=timezone endpoint, leveraging the filesystem_attachments plugin to serve the contents of arbitrary files, including sensitive configuration files. Exploitation requires a valid user session.
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Cross-references every affected SKU, including bundled OEM variants.
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