Drupal 7 and 8 core critical release on March 28th, 2018 PSA-2018-001

* Advisory ID: DRUPAL-PSA-2018-001
* Project: Drupal Core
* Version: 7.x, 8.x
* Date: 2018-March-21

DESCRIPTION

There will be a security release of *Drupal 7.x, 8.3.x, 8.4.x, and 8.5.x on
March 28th 2018 between 18:00 - 19:30 UTC*, one week from the publication of
this document, that will fix a highly critical security vulnerability. The
Drupal Security Team urges you to reserve time for core updates at that time
because exploits /might/ be developed within hours or days. Security release
announcements will appear on the Drupal.org security advisory page [1].

While Drupal 8.3.x and 8.4.x are no longer supported and we don't normally
provide security releases for unsupported minor releases, given the
potential severity of this issue, we /are/ providing 8.3.x and 8.4.x releases
that includes the fix for sites which have not yet had a chance to update to
8.5.0. The Drupal security team strongly recommends the following:

* Sites on 8.3.x should immediately update to the 8.3.x release that will be
provided in the advisory, and then plan to update to the latest 8.5.x
security release in the next month.
* Sites on 8.4.x should immediately update to the 8.4.x release that will be
provided in the advisory, and then plan to update to the latest 8.5.x
security release in the next month.
* Sites on 7.x or 8.5.x can immediately update when the advisory is released
using the normal procedure.

The security advisory will list the appropriate version numbers for all three
Drupal 8 branches. Your site's update report page will recommend the 8.5.x
release even if you are on 8.3.x or 8.4.x, but temporarily updating to the
provided backport for your site's current version will ensure you can update
quickly without the possible side effects of a minor version update.

The Security Team or any other party is not able to release any more
information about this vulnerability until the announcement is made. The
announcement will be made public at www.drupal.org/security, over
Twitter, and in email for those who have subscribed to our email list. To
subscribe to the email list: log in on drupal.org, go to your user profile
page and subscribe to the security newsletter on the Edit » My newsletters
tab.

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