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.

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - 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. (CVE-2026-42521)

According to their self-reported version numbers, the version of Jenkins plugins running on the remote web server are affected by multiple vulnerabilities:

  - High HTML Publisher Plugin 427 and earlier does not escape job name and URL in the legacy wrapper file.
    This results in a stored cross-site scripting (XSS) vulnerability exploitable by attackers with     Item/Configure permission. HTML Publisher Plugin 427.1 escapes job name and URL when generating the legacy     wrapper file. This fix only applies to newly generated wrappers. On Jenkins 2.539 and newer, LTS 2.541.1     and newer, enforcing Content Security Policy protection mitigates this vulnerability. This vulnerability     has been reported through the Jenkins Bug Bounty Program sponsored by the European Commission.
    (CVE-2026-42524)

  - Medium Script Security Plugin 1399.ve6a_66547f6e1 and earlier does not perform a permission check in an     HTTP endpoint. This allows attackers with Overall/Read permission to enumerate pending and approved Script     Security classpaths. Script Security Plugin 1402.v94c9ce464861 requires Overall/Administer permission to     enumerate pending and approved Script Security classpaths. This vulnerability has been reported through     the Jenkins Bug Bounty Program sponsored by the European Commission. (CVE-2026-42519)

  - High Credentials Binding Plugin 719.v80e905ef14eb_ and earlier does not sanitize file names for file and     zip file credentials. This allows attackers able to provide credentials to a job to write files to     arbitrary locations on the node filesystem. If Jenkins is configured to allow a low-privileged user to     configure file or zip file credentials used for a job running on the built-in node, this can lead to     remote code execution. Credentials Binding Plugin 720.v3f6decef43ea_ sanitizes the file name provided for     file and zip file credentials, preventing path traversal. This vulnerability has been reported through the     Jenkins Bug Bounty Program sponsored by the European Commission. (CVE-2026-42520)

  - Medium 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. This can be abused by 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. Matrix Authorization Strategy Plugin     3.2.10 verifies that the class being instantiated is an inheritance strategy implementation, preventing     instantiation of arbitrary types. This vulnerability has been reported through the Jenkins Bug Bounty     Program sponsored by the European Commission. (CVE-2026-42521)

  - Medium GitHub Branch Source Plugin 1967.vdea_d580c1a_b_a_ and earlier does not perform a permission check     in a method implementing form validation. This allows attackers with Overall/Read permission to connect to     an attacker-specified URL with attacker-specified GitHub App credentials. GitHub Branch Source Plugin     1967.1969.v205fd594c821 requires Overall/Manage permission to perform the connection test. This     vulnerability has been reported through the Jenkins Bug Bounty Program sponsored by the European     Commission. (CVE-2026-42522)

  - High GitHub Plugin 1.46.0 and earlier improperly processes the current job URL as part of JavaScript     implementing validation of the feature GitHub hook trigger for GITScm polling. This results in a stored     cross-site scripting (XSS) vulnerability exploitable by non-anonymous attackers with Overall/Read     permission. GitHub Plugin 1.46.0.1 no longer processes the current job URL as part of JavaScript     implementing validation of the feature GitHub hook trigger for GITScm polling. This vulnerability has     been reported through the Jenkins Bug Bounty Program sponsored by the European Commission.
    (CVE-2026-42523)

  - Medium Microsoft Entra ID (previously Azure AD) Plugin 666.v6060de32f87d and earlier does not restrict the     redirect URL after login. This allows attackers to perform phishing attacks by having users go to a     Jenkins URL that will forward them to a different site after successful authentication. Microsoft Entra ID     (previously Azure AD) Plugin 667.v4c5827a_e74a_0 only redirects to relative (Jenkins) URLs.
    (CVE-2026-42525)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Type	Severity
441388	SCA: security update for org.jenkins-ci.plugins:matrix-auth (GHSA-jp9r-mmhw-vff3)	Tenable Cloud Security	SCA Checks	Local	medium
441388	SCA: security update for org.jenkins-ci.plugins:matrix-auth (GHSA-jp9r-mmhw-vff3)	Tenable Self-Hosted Container Security	SCA Checks	Local	medium
310885	Jenkins plugins Multiple Vulnerabilities (2026-04-29)	Nessus	CGI abuses	Combined	critical

Detections

Analytics

CVE-2026-42521

medium

Tenable Plugins

medium

medium

critical