Contao Open Source CMS 5.3.15

Contao 5.3.15, a new version of the Contao open source CMS, has been released.

For all three currently supported Contao versions, Contao 4.13.49, 5.3.15 and 5.4.3 fix two security vulnerabilities. One was reported by Jakob Steeg from usd AG and the other was discovered by Andreas Schempp from the core team. The Contao core team has categorised the potential damage of one of the two vulnerabilities as "high". A quick update is therefore essential in any case, there are no workarounds.

Vulnerability details

About Contao 5.3 LTS

The first stable version of Contao 5.3 has been released on February 16, 2024, replacing Contao 4.13 as the long term support version. As an LTS version, 5.3 will be provided with bug fixes until February 14, 2027 and security-related updates until February 14, 2028. Contao 5.7 is the next LTS version of Contao and was released in February 2026, ensuring a smooth transition.

Bjarke Ammann

Bjarke takes care of the website and support. If you like reading, you might have come across his Contao Two Month Review or found an answer to your question in the official Contao user manual. He also makes sure that Contao enthusiasts from Switzerland meet regularly to exchange ideas. He loves culinary delights, good music and exercise in the fresh air.

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