…from Apple Mailing:

Date: Wed, 18 May 2016 15:34:13 -0700
From: Apple Product Security
Subject: APPLE-SA-2016-05-18-1 OS X: Flash Player plug-in blocked
Message-ID: <199D3B09-9CFE-45F9-B832-EE0998BB2ACF@lists.apple.com>
Content-Type: text/plain; charset=us-ascii

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APPLE-SA-2016-05-18-1 OS X: Flash Player plug-in blocked

Due to security issues in older versions, Apple has
updated the web plug-in blocking mechanism to disable all
versions prior to Flash Player 21.0.0.242 and 18.0.0.352.

Information on blocked web plug-ins will be posted to:
http://support.apple.com/en-us/HT202681

This message is signed with Apple's Product Security PGP key,
and details are available at:
https://www.apple.com/support/security/pgp/
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