Capsule has an incomplete fix of CVE-2026-22872: TenantResource RawItems and Generators still allow cluster-scoped resource creation (cross-tenant privilege escalation)

Exploitation

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

CVSS

6.6 · CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:L/A:L

EPSS

• CVE-2026-65835: 0.24% estimated exploitation activity in the next 30 days; percentile 14.54 (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.

Summary CVE-2026-22872 (GHSA-qjjm-7j9w-pw72) reported that a Tenant Owner could create cluster-scoped resources (e.g. ClusterRole, ValidatingWebhookConfiguration) through a TenantResource, because the controller applies them with its cluster-admin ServiceAccount and SetNamespace is ineffective for cluster-scoped kinds. The v0.13.0 fix added a cluster-scope rejection guard, but only on the NamespacedItems selection path (ResourceReference.LoadResources - IsNamespacedGVK, error "cluster-scoped kind ... is not allowed"). The RawItems create path — the exact vector the original advisory named — and the Generators path were not given this guard. The vulnerability therefore persists in all releases v0.13.0 through v0.13.7 and on trunk HEAD (8d89d6865d). Details TenantResource reconcile flow: - internal/controllers/resources/namespaced.go reconcile() obtains the apply client via loadClient(); by default (impersonation off, no Spec.ServiceAccount) this is the manager client whose SA is bound…

Published by the source

31 Jul 2026, 16:53 UTC

Last modified by the source

18 Aug 2026, 15:00 UTC

Source last checked

26 Oct 2026, 15:28 UTC

1. Revision 3 · amended · 26 Oct 2026

   Amended from ghsa record GHSA-jr6p-8pjj-mfx6

2. Revision 2 · amended · 24 Oct 2026

   Amended from osv record GO-2026-6157

3. Revision 1 · created · 24 Oct 2026

   Published from osv record GHSA-jr6p-8pjj-mfx6

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# Patch Next advisory brief: CVE-2026-65835

Advisory: Capsule has an incomplete fix of CVE-2026-22872: TenantResource RawItems and Generators still allow cluster-scoped resource creation (cross-tenant privilege escalation)
IDs: CVE-2026-65835, GHSA-jr6p-8pjj-mfx6
Record: https://patchnext.com/advisories/cve-2026-65835 (revision 3, source checked 26 Oct 2026, 15:28 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 6.6)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: github.com/projectcapsule/capsule 0.13.8. A vendor fix does not mean a deployment is fixed.

## Affected components
- Go github.com/projectcapsule/capsule: affected >= 0.13.0, <= 0.13.7; fixed in 0.13.8

## Suggested inspection (read-only)
- Go github.com/projectcapsule/capsule: 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/projectcapsule/capsule.
- 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://osv.dev/vulnerability/GHSA-jr6p-8pjj-mfx6 (OSV record GHSA-jr6p-8pjj-mfx6 lists affected ranges: Go github.com/projectcapsule/capsule >=0.13.0 <0.13.8 (fixed))
- Verified: https://osv.dev/vulnerability/GO-2026-6157 (OSV record GO-2026-6157 lists affected ranges: Go github.com/projectcapsule/capsule >=0.13.0 <0.13.8 (fixed))
- Verified: https://github.com/advisories/GHSA-jr6p-8pjj-mfx6 (GitHub-reviewed advisory GHSA-jr6p-8pjj-mfx6 lists affected ranges: Go github.com/projectcapsule/capsule >=0.13.0 <=0.13.7)

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