Use of Externally-Controlled Input to Select Classes or Code ('Unsafe Reflection') Affecting org.jenkins-ci.plugins:matrix-auth package, versions [,3.2.10)
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-ORGJENKINSCIPLUGINS-16322871
- published30 Apr 2026
- disclosed30 Apr 2026
- creditArafat Ul Islam
Introduced: 30 Apr 2026
NewCVE-2026-42521 (opens in a new tab)How to fix?
Upgrade org.jenkins-ci.plugins:matrix-auth to version 3.2.10 or higher.
Overview
org.jenkins-ci.plugins:matrix-auth is a The Jenkins Plugins Parent POM Project
Affected versions of this package are vulnerable to Use of Externally-Controlled Input to Select Classes or Code ('Unsafe Reflection') via the inheritanceStrategy deserialization path in AbstractAuthorizationPropertyConverter. An attacker can trigger instantiation of attacker-chosen classes by supplying crafted XML for an AuthorizationMatrixProperty during job or configuration deserialization. This can execute unexpected constructors and disrupt Jenkins by loading untrusted classes while restoring authorization settings.