Vulnerability · Published Jul 30, 2026 · Assigned by GitHub_M

CVE-2026-65835Capsule: Incomplete fix of CVE-2026-22872: TenantResource RawItems and Generators still allow cluster-scoped resource creation (cross-tenant privilege escalation)

Medium 6.6

In plain English

A medium-severity privilege mismanagement in capsule from projectcapsule. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 15% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)6.6Medium

Exploit odds (30 days)0.2%top 85.5% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

Capsule is a multi-tenancy and policy-based framework for Kubernetes. From 0.13.0 until 0.13.8, after the incomplete CVE-2026-22872 fix, TenantResource RawItems and Generators in internal/controllers/resources/collect.go, including handleRawItem and handleGeneratorItem, did not apply the ResourceReference.LoadResources and IsNamespacedGVK cluster-scoped resource rejection guard used by NamespacedItems, allowing a Tenant Owner to create cluster-scoped resources such as ClusterRole or ValidatingWebhookConfiguration through the cluster-admin controller client. This issue is fixed in version 0.13.8.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Go	github.com/projectcapsule/capsule	0.13.8	GHSA-jr6p-8pjj-mfx6
Go	github.com/projectcapsule/capsule	0.13.8	GO-2026-6157

Affected products (as reported)

Vendor	Product	Versions
projectcapsule	capsule	>= 0.13.0, < 0.13.8

Weakness: CWE-269, CWE-863 · Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:L/A:L

References

https://github.com/projectcapsule/capsule/security/advisories/GHSA-jr6p-8pjj-mfx6 x_refsource_CONFIRM
https://github.com/projectcapsule/capsule/releases/tag/v0.13.8 x_refsource_MISC