PGP 6.x and 7.x does not clear Windows alternate data streams that are attached to files on NTFS file systems, which allows attackers to recover sensitive information that was supposed to be deleted.

Microsoft Outlook plug-in PGP version 7.0, 7.0.3, and 7.0.4 silently saves a decrypted copy of a message to hard disk when "Automatically decrypt/verify when opening messages" option is checked, "Always use Secure Viewer when decrypting" option is not checked, and the user replies to an encrypted message.

The split key mechanism used by PGP 7.0 allows a key share holder to obtain access to the entire key by setting the "Cache passphrase while logged on" option and capturing the passphrases of other share holders as they authenticate.