Jenkins Pipeline: Groovy Plugin vulnerable to unrestricted instantiation of types

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

4.3 · CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

EPSS

• CVE-2026-57284: 0.34% estimated exploitation activity in the next 30 days; percentile 27.32 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Jenkins Pipeline: Groovy Plugin 4331.v9d06ed4658ff and earlier does not restrict the types that can be instantiated through the Pipeline Snippet Generator, instantiating any type with a constructor annotated with @DataBoundConstructor in response to a request. This allows attackers to have Pipeline: Groovy Plugin instantiate types related to job or system configuration other than Pipeline steps. Additionally, this HTTP endpoint can be accessed using the GET method and does not require POST requests, resulting in a cross-site request forgery (CSRF) vulnerability. This allows attackers to create a script approval request attributed to another user, impersonating a trusted user when social engineering an administrator into approving a malicious script. This vulnerability has been reported through the Jenkins Bug Bounty Program sponsored by the European Commission. Pipeline: Groovy Plugin 4331.4333.v50ab076c5199 only instantiates Pipeline steps and metastep delegates through the Snippet…

Published by the source

24 Jun 2026, 15:31 UTC

Last modified by the source

25 Sep 2026, 18:08 UTC

Source last checked

26 Oct 2026, 16:55 UTC

1. Revision 1 · created · 26 Oct 2026

   Published from ghsa record GHSA-2w2h-gwwj-fh3q

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# Patch Next advisory brief: CVE-2026-57284

Advisory: Jenkins Pipeline: Groovy Plugin vulnerable to unrestricted instantiation of types
IDs: CVE-2026-57284, GHSA-2w2h-gwwj-fh3q
Record: https://patchnext.com/advisories/cve-2026-57284 (revision 1, source checked 26 Oct 2026, 16:55 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 4.3)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: io.jenkins.plugins:pipeline-groovy-lib 4331.4333. A vendor fix does not mean a deployment is fixed.

## Affected components
- Maven io.jenkins.plugins:pipeline-groovy-lib: affected < 4331.4333; fixed in 4331.4333

## Suggested inspection (read-only)
- Maven io.jenkins.plugins:pipeline-groovy-lib: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on io.jenkins.plugins:pipeline-groovy-lib.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-2w2h-gwwj-fh3q (GitHub-reviewed advisory GHSA-2w2h-gwwj-fh3q lists affected ranges: Maven io.jenkins.plugins:pipeline-groovy-lib >=0 <4331.4333)

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