Jenkins Matrix Authorization Strategy Plugin up to 3.2.9 Configuration permission

Summaryinfo

A vulnerability classified as critical has been found in Jenkins Matrix Authorization Strategy Plugin up to 3.2.9. This impacts an unknown function of the component Configuration Handler. The manipulation leads to permission. This vulnerability is traded as CVE-2026-42521. It is possible to initiate the attack remotely. There is no exploit available.

Detailsinfo

A vulnerability was found in Jenkins Matrix Authorization Strategy Plugin up to 3.2.9 and classified as critical. This issue affects some unknown processing of the component Configuration Handler. The manipulation with an unknown input leads to a permission vulnerability. Using CWE to declare the problem leads to CWE-275. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

Jenkins Matrix Authorization Strategy Plugin 2.0-beta-1 through 3.2.9 (both inclusive) invokes parameterless constructors of classes specified in configuration when deserializing inheritance strategies, without restricting the classes that can be instantiated, allowing attackers with Item/Configure permission to instantiate arbitrary types, which may lead to information disclosure or other impacts depending on the classes available on the classpath.

The advisory is shared at jenkins.io. The identification of this vulnerability is CVE-2026-42521 since 04/28/2026. The exploitation is known to be easy. The attack may be initiated remotely. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 05/01/2026). MITRE ATT&CK project uses the attack technique T1222 for this issue.

The vulnerability scanner Nessus provides a plugin with the ID 310885 (Jenkins plugins Multiple Vulnerabilities (2026-04-29)), which helps to determine the existence of the flaw in a target environment.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the databases at Tenable (310885), EUVD (EUVD-2026-26222) and CERT Bund (WID-SEC-2026-1320). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Affected

• Jenkins Jenkins

Productinfo

Type

• Continuous Integration Software

Vendor

• Jenkins

Name

• Matrix Authorization Strategy Plugin

Version

• 3.2.0
• 3.2.1
• 3.2.2
• 3.2.3
• 3.2.4
• 3.2.5
• 3.2.6
• 3.2.7
• 3.2.8
• 3.2.9

License

• open-source

Website

• Vendor: https://jenkins.io/

CPE 2.3info

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CPE 2.2info

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Entryinfo

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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