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Fix several vulnerabilities (#13927)
* Escape HTML in the location field of a calendar event post - This allowed script tags to be interpreted in the post display of an event. * Add form security token check to /admin/phpinfo module - This prevents basic XSS attacks against /admin/phpinfo * Add form security token check to /babel module - This prevents basic XSS attacks against /babel * Prevent pass-through for attachments - This addresses a straightforward Reflected XSS vulnerability if a malicious HTML/Javascript file is attached to a post through upload * Prevent overwriting cid on event edit - This allowed to share an event as any other user after zeroing the cid field of an existing event
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