# Security Release: FLX 1.4.0 and Classic 53.8

**URL:** <https://forum.search-guard.com/t/security-release-flx-1-4-0-and-classic-53-8/2474>\
**Category:** Announcements\
**Created:** [November 30, 2023, 1:57pm UTC](https://forum.search-guard.com/t/security-release-flx-1-4-0-and-classic-53-8/2474 "2023-11-30T13:57:20Z")\
**Posts on this page:** 1\
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**Author:** ![searchguard](https://sea1.discourse-cdn.com/flex019/user_avatar/forum.search-guard.com/searchguard/32/1830_2.png) [@searchguard](https://forum.search-guard.com/u/searchguard)\
**Post date:** [November 30, 2023, 1:57pm UTC](https://forum.search-guard.com/t/security-release-flx-1-4-0-and-classic-53-8/2474/1 "2023-11-30T13:57:20Z")

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Hi all,

We have just released Search Guard FLX 1.4.0 and Search Guard 53.8, which contains a critical security fix for Multitenancy.

If you do not use the Multitenancy feature, you are not affected. If you do, we strongly recommend to upgrade.

Changelogs:

- [Search Guard FLX 1.4.0](https://docs.search-guard.com/latest/changelog-searchguard-flx-1_4_0)
- [Search Guard 53.8.0](https://docs.search-guard.com/latest/changelog-searchguard-7x-53_8_0)

You can find all available versions here:

- [Search Guard Versions](https://docs.search-guard.com/latest/search-guard-versions)

Thanks for all your support, feedback, and input!

* * *

Search Guard (®) is an Elasticsearch plugin that offers encryption, authentication, authorization, and alerting.

Coded with love in Berlin, Denmark, Sweden, Italy, Ukraine, Poland, Ireland, and the US.

Search Guard is a trademark of floragunn GmbH, registered in the U.S. and other countries.

Elasticsearch, Kibana, Logstash, and Beats are trademarks of Elasticsearch BV, registered in the U.S. and other countries.

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