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This is a security release which fixes the vulnerability CVE-2021-35210. No other bugs have been fixed in this release.
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 has been released in February 2022, ensuring a stress-free transition.