Dropwizard-Validation before 1.3.19, and 2.0.2 may allow arbitrary code execution on the host system, with the privileges of the Dropwizard service account, by injecting arbitrary Java Expression Language expressions when using the self-validating feature.

The issue has been fixed in dropwizard-validation 1.3.19 and 2.0.2.

Affected: Maven: io.dropwizard:dropwizard-validation

Dropwizard-Validation before 1.3.19, and 2.0.2 may allow arbitrary code execution on the host system, with the privileges of the Dropwizard service account, by injecting arbitrary Java Expression Language expressions when using the self-validating feature.

### Summary

A server-side template injection was identified in the self-validating ([`@SelfValidating`](https://javadoc.io/static/io.dropwizard/dropwizard-project/2.0.2/io/dropwizard/validation/selfvalidating/SelfValidating.html)) feature of **dropwizard-validation** enabling attackers to inject arbitrary Java EL expressions, leading to Remote Code Execution (RCE) vulnerability.

If you're using a self-validating bean (via [`@SelfValidating`](https://javadoc.io/static/io.dropwizard/dropwizard-project/2.0.2/io/dropwizard/validation/selfvalidating/SelfValidating.html)), an upgrade to Dropwizard 1.3.19 or 2.0.2 is strongly recommended.

### Impact

This issue may allow Remote Code Execution (RCE), allowing to run arbitrary code on the host system (with the privileges of the Dropwizard service account privileges) by injecting arbitrary [Java Expression Language (EL)](https://docs.jboss.org/hibernate/validator/6.1/reference/en-US/html_single/#section-interpolation-with-message-expressions) expressions when using the self-validating feature ([`@SelfValidating`](https://javadoc.io/static/io.dropwizard/dropwizard-project/2.0.2/io/dropwizard/validation/selfvalidating/SelfValidating.html), [`@SelfValidation`](https://javadoc.io/st…