Insecure Randomness Affecting org.apache.wicket:wicket-core package, versions [9.0.0,9.24.0)[10.0.0,10.10.0)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-JAVA-ORGAPACHEWICKET-21816612
- published29 Oct 2026
- disclosed27 Jul 2026
- creditUnknown
Introduced: 27 Jul 2026
CVE-2026-66391 (opens in a new tab)How to fix?
Upgrade org.apache.wicket:wicket-core to version 9.24.0, 10.10.0 or higher.
Overview
org.apache.wicket:wicket-core is a Java web application framework that takes simplicity, separation of concerns and ease of development to a whole new level. Wicket pages can be mocked up, previewed and later revised using standard WYSIWYG HTML design tools. Dynamic content processing and form handling is all handled in Java code using a first-class component model backed by POJO data beans that can easily be persisted using your favorite technology.
Affected versions of this package are vulnerable to Insecure Randomness in the CSPRequestCycleListener class, which emits the CSP header and its nonce according to the active request handler. An attacker can bypass the Content-Security-Policy an application configures because the header is missing from some responses and leaks onto others it should not cover, so content on an affected response is not constrained by the intended policy. This affects only applications that enable Wicket's CSP support through ContentSecurityPolicySettings.