There will be a security release of Drupal 7.x, 8.4.x, and 8.5.x on April 25th, 2018 between 16:00 - 18:00 UTC. This PSA is to notify that the Drupal core release is outside of the regular schedule of security releases. For all security updates, the Drupal Security Team urges you to reserve time for core updates at that time because there is some risk that exploits might be developed within hours or days. Security release announcements will appear on the Drupal.org security advisory page.

This security release is a follow-up to the one released as SA-CORE-2018-002 on March 28.

Sites on 7.x or 8.5.x can immediately update when the advisory is released using the normal procedure.

Sites on 8.4.x should immediately update to the 8.4.8 release that will be provided in the advisory, and then plan to update to 8.5.3 or the latest security release as soon as possible (since 8.4.x no longer receives official security coverage).

The security advisory will list the appropriate version numbers for each branch. Your site's update report page will recommend the 8.5.x release even if you are on 8.4.x or an older release, 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.

Patches for Drupal 7.x, 8.4.x, 8.5.x and 8.6.x will be provided in addition to the releases mentioned above. (If your site is on a Drupal 8 release older than 8.4.x, it no longer receives security coverage and will not receive a security update. The provided patches may work for your site, but upgrading is strongly recommended as older Drupal versions contain other disclosed security vulnerabilities.)

This release will not require a database update.

The CVE for this issue is CVE-2018-7602. The Drupal-specific identifier for the issue will be SA-CORE-2018-004.

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 https://www.drupal.org/security, over Twitter, and in email for those who have subscribed to our email list. To subscribe to the email list: login on Drupal.org, go to your user profile page, and subscribe to the security newsletter on the Edit » My newsletters tab.

Journalists interested in covering the story are encouraged to email security-press@drupal.org to be sure they will get a copy of the journalist-focused release. The Security Team will release a journalist-focused summary email at the same time as the new code release and advisory.

If you find a security issue, please report it at https://www.drupal.org/security-team/report-issue.