Spring Vulnerabilities: CERT-FR Advisory on Security Risks

French cybersecurity agency CERT-FR published advisory CERTFR-2026-AVI-0554 on 11 May 2026, warning of multiple vulnerabilities in Spring products. The risks identified include remote code execution, remote denial of service and breach of data confidentiality.

What was found?

According to CERT-FR, the French national cybersecurity agency (ANSSI), attackers could potentially exploit these vulnerabilities to run malicious code on affected systems from a distance, make services unavailable or access data that should remain private. The advisory does not specify whether any of these vulnerabilities have been actively exploited.

Who is affected?

Spring is a widely used software framework that developers rely on to build web applications and online services. If your website or any back-end system your business uses was built with Spring, your developer or hosting provider should check whether the software is running an affected version.

What should you do?

CERT-FR advises users to consult Spring's own security bulletins to obtain the relevant patches. If you work with a developer or a managed hosting provider, forward this advisory to them and ask them to confirm whether your systems are up to date. Applying security patches promptly is one of the most effective steps you can take to protect your business and your customers' data.

If you are unsure whether your website uses Spring, your developer will be able to tell you. More general guidance on keeping your website secure is available in our security checklist for small businesses. If your site runs on WordPress, it is also worth checking our guide on vulnerable plugins, as outdated components are a common entry point for attackers.

What does this mean for your website?

If your website or any tools connected to it are built on Spring, you should ask your developer or hosting provider to check for and apply the patches described in Spring's security bulletins. Under UK GDPR and the Data Protection Act 2018, you are responsible for keeping your customers' personal data secure, and unpatched software can put that data at risk. Staying on top of software updates is a practical, low-cost way to meet that responsibility.