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High, CVSS 7.5

Unauthorized access to Argo Workflows Template

CVE-2026-28229GHSA-56px-hm34-xqj5

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (github.com/argoproj/argo-workflows/v4 4.0.2; github.com/argoproj/argo-workflows/v3 3.7.11), 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
7.5 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
EPSS
  • CVE-2026-28229: 0.68% estimated exploitation activity in the next 30 days; percentile 52.35 (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.

Summary Workflow templates endpoints allow any client to retrieve WorkflowTemplates (and ClusterWorkflowTemplates). Any request with a Authorization: Bearer nothing token can leak sensitive template content, including embedded Secret manifests. Details https://github.com/argoproj/argo-workflows/blob/b519c9054e66b2f0a25eec06709717bd1362f72e/server/workflowtemplate/workflowtemplateserver.go#L60-L78 https://github.com/argoproj/argo-workflows/blob/b519c9054e66b2f0a25eec06709717bd1362f72e/server/clusterworkflowtemplate/clusterworkflowtemplateserver.go#L54-L72 Informers use the server’s rest config, so they read using server SA privileges. https://github.com/argoproj/argo-workflows/blob/b519c9054e66b2f0a25eec06709717bd1362f72e/server/workflowtemplate/informer.go#L29-L42 https://github.com/argoproj/argo-workflows/blob/b519c9054e66b2f0a25eec06709717bd1362f72e/server/clusterworkflowtemplate/informer.go#L34-L46 PoC 1. Create template Then apply that with kubectl apply -f poc.yml 2. Query Argo…

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

    Published from ghsa record GHSA-56px-hm34-xqj5

Agent brief

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# Patch Next advisory brief: CVE-2026-28229

Advisory: Unauthorized access to Argo Workflows Template
IDs: CVE-2026-28229, GHSA-56px-hm34-xqj5
Record: https://patchnext.com/advisories/cve-2026-28229 (revision 1, source checked 26 Oct 2026, 15:20 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 7.5)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: github.com/argoproj/argo-workflows/v4 4.0.2; github.com/argoproj/argo-workflows/v3 3.7.11. A vendor fix does not mean a deployment is fixed.

## Affected components
- Go github.com/argoproj/argo-workflows/v4: affected < 4.0.2; fixed in 4.0.2
- Go github.com/argoproj/argo-workflows/v3: affected >= 3.7.0, < 3.7.11; fixed in 3.7.11

## Suggested inspection (read-only)
- Go github.com/argoproj/argo-workflows/v4: check the installed version with your package manager.
- Go github.com/argoproj/argo-workflows/v3: 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 github.com/argoproj/argo-workflows/v4, github.com/argoproj/argo-workflows/v3.
- 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-56px-hm34-xqj5 (GitHub-reviewed advisory GHSA-56px-hm34-xqj5 lists affected ranges: Go github.com/argoproj/argo-workflows/v4 >=0 =3.7.0 <3.7.11)

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