CVE-2021-43466 Template injection in thymeleaf-spring5

What is CVE-2021-43466?

CVE-2021-43466 is a critical code injection vulnerability in n/a, published on 9 Nov 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

In the thymeleaf-spring5:3.0.12 component, thymeleaf combined with specific scenarios in template injection may lead to remote code execution.

Weakness: CWE-94

Which versions are affected by CVE-2021-43466?

2 open source packages ship an affected version, including org.thymeleaf:thymeleaf-spring5. It affects 1 product.

Products include Thymeleaf Thymeleaf.

How do I fix CVE-2021-43466?

Upgrade org.thymeleaf:thymeleaf-spring5 to 3.0.13.RELEASE or later.

Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.

Is CVE-2021-43466 being exploited?

There is no known exploitation of CVE-2021-43466 in the wild and no public exploit code.

Other vulnerabilities in n/a

• CVE-2026-40477 Improper restriction of the scope of accessible objects in Thymeleaf expressions Critical 9.1
• CVE-2026-40478 Improper neutralization of specific syntax patterns for unauthorized expressions in Thymeleaf Critical 9.1

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-qcj6-jqrg-4wp2.