CVE-2026-42521Network attack vector

Arbitrary constructor invocation via unchecked class loading

Published Apr 29, 2026 · Updated Apr 29, 2026

Unsafe deserialization in Jenkins matrix-auth 2.0-beta-1 through 3.2.9 allows remote authenticated users to instantiate arbitrary types. AbstractAuthorizationPropertyConverter reads the inheritanceStrategy class attribute, loads that class, and invokes its parameterless constructor without first verifying that it implements InheritanceStrategy. Item/Configure permission is required; constructor side effects can disclose information or cause other class-dependent impacts.

CVSS severity6.5
Medium
EPSS probability0.25%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Unsafe deserialization in Jenkins matrix-auth 2.0-beta-1 through 3.2.9 allows remote authenticated users to instantiate arbitrary types. AbstractAuthorizationPropertyConverter reads the inheritanceStrategy class attribute, loads that class, and invokes its parameterless constructor without first verifying that it implements InheritanceStrategy. Item/Configure permission is required; constructor side effects can disclose information or cause other class-dependent impacts.

The record

CVE
CVE-2026-42521
Published
Apr 29, 2026
Updated
Apr 29, 2026
Vendor
Jenkins Project
Product
Matrix Authorization Strategy Plugin
Classifications
CWE-502
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 29, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 29, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=2.0-beta-1 <=3.2.9

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Jenkins Project · Matrix Authorization Strategy Pluginversion=2.0-beta-1 <=3.2.9

Published CVSS scores

6.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-502Deserialization of Untrusted Data

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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