Contao 4.9.21, a new version of the Contao open source CMS, has been released.

In this release, further optimizations have been made to the new HTML filter. Now not only PNG/JPEG to WebP but also vice versa WebP can be automatically converted to PNG/JPEG (if the server supports this). The HttpCache can now be deactivated via an ENV variable and the backend can no longer be called by mistake via the front end preview.

Changelog of the fixed issues in Contao 4.9.21:

About Contao 4.9 LTS

The first stable version of Contao 4.9 was released on February 18, 2020, replacing Contao 4.4 as the long term support version. As an LTS version, 4.9 will be provided with bug fixes until February 14, 2023 and security-related updates until February 14, 2024. Contao 4.13 will be the next LTS version of Contao and will be released in February 2022, ensuring a stress-free transition.

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