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Medium, CVSS 4.3

Missing permission checks in Jenkins Warnings Next Generation Plugin allow listing workspace contents

CVE-2021-21626GHSA-7j3x-xm4j-jfj7

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (io.jenkins.plugins:warnings-ng 8.5.0), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

Sources

Severity and exploitation
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-2021-21626: 0.86% estimated exploitation activity in the next 30 days; percentile 58.49 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

Jenkins Warnings Next Generation Plugin 8.4.4 and earlier does not perform permission checks in methods implementing form validation. This allows attackers with Item/Read permission but without Item/Workspace or Item/Configure permission to check whether attacker-specified file patterns match workspace contents. A sequence of requests can be used to effectively list workspace contents. Jenkins Warnings Next Generation Plugin 8.5.0 requires Item/Configure permission to validate patterns with workspace contents.

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 1 · created ·

    Published from ghsa record GHSA-7j3x-xm4j-jfj7

Agent brief

Preview the exact text before you copy it. Commands are read-only suggestions; review them before running anything.

# Patch Next advisory brief: CVE-2021-21626

Advisory: Missing permission checks in Jenkins Warnings Next Generation Plugin allow listing workspace contents
IDs: CVE-2021-21626, GHSA-7j3x-xm4j-jfj7
Record: https://patchnext.com/advisories/cve-2021-21626 (revision 1, source checked 26 Oct 2026, 16:15 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:warnings-ng 8.5.0. A vendor fix does not mean a deployment is fixed.

## Affected components
- Maven io.jenkins.plugins:warnings-ng: affected <= 8.4.4; fixed in 8.5.0

## Suggested inspection (read-only)
- Maven io.jenkins.plugins:warnings-ng: 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:warnings-ng.
- 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-7j3x-xm4j-jfj7 (GitHub-reviewed advisory GHSA-7j3x-xm4j-jfj7 lists affected ranges: Maven io.jenkins.plugins:warnings-ng >=0 <=8.4.4)

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