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

published 2026-07-30 3 mo ago modified 2026-10-23 16 d ago also GHSA-jr6p-8pjj-mfx6 , GO-2026-6157 , EUVD-2026-51296

cvss: 6.6; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.2%; EPSS 0.2% chance of exploitation in 30 days, percentile 14%
public exploits: 0; none known

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.

Patch / fix

fixed in 1 distros 2 links 1

go github.com/projectcapsule/capsule 0.13.8

suse opensuse

govulncheck-vulndb SLES for SAP applications 16.0, SLES 16.0 0.0.20260827T195228-160000.1.1

suse advisories SUSE-SU-2026:23625-1

govulncheck-vulndb openSUSE Leap 16.0 0.0.20260827T195228-160000.1.1

opensuse advisories openSUSE-SU-2026:21761-1

github.com/projectcapsule/capsule/releases/tag/v0.13.8 release

CISA SSVC

Exploitation: Proof of concept is public
Automatable: no
Technical impact: partial
Assessed: 3 mo ago (2026-07-31)

Exploit prediction

0.24% chance of exploitation in the next 30 days, higher than 14% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

github.com https://github.com/projectcapsule/capsule/security/advisories/GHSA-jr6p-8pjj-mfx6 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
CNA	3.1	6.6	CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:L/A:L
GitHub	3.1	6.6	CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:L/A:L

Affected packages

ecosystem	package	affected	fixed in
go	github.com/projectcapsule/capsule	>=0.13.0, <0.13.8	0.13.8

Affected products

projectcapsule capsule

Classification

Weakness

CWE-269 Improper Privilege Management
CWE-863 Incorrect Authorization

References

github.com /projectcapsule/capsule/security/advisories/GHSA-jr6p-8pjj-mfx6
exploit, web, advisory
github.com /projectcapsule/capsule/releases/tag/v0.13.8
web
nvd.nist.gov /vuln/detail/CVE-2026-65835
advisory
github.com /projectcapsule/capsule
package

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary