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

> Tenant owners can escalate privileges to create cluster-scoped resources like ClusterRoles due to missing validation in Capsule's resource handling logic.

- **Severity:** Medium 6.6 (`CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:L/A:L`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 30 Jul 2026
- **Updated:** 31 Jul 2026
- **Also known as:** GHSA-jr6p-8pjj-mfx6, GO-2026-6157

## What is CVE-2026-65835?

CVE-2026-65835 is a medium-severity vulnerability in projectcapsule capsule, published on 30 Jul 2026. An attacker needs administrator access to exploit it, with no action from the victim.

### 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.

Weakness: CWE-863 (Incorrect Authorization), CWE-269 (Improper Privilege Management)

## Which versions are affected by CVE-2026-65835?

3 open source packages ship an affected version, including github.com/projectcapsule/capsule.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `github.com/projectcapsule/capsule` | Go | From 0.13.0 | 0.13.8 |
| `github.com/projectcapsule/capsule` | Go | From 0.13.0 | 0.13.8 |
| `github.com/projectcapsule/capsule` | Go | From 0.13.0 | 0.13.8 |

## How do I fix CVE-2026-65835?

Upgrade github.com/projectcapsule/capsule to 0.13.8 or later.

## Is CVE-2026-65835 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-65835 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-65835 and fix it if it is affected.

What it is: CVE-2026-65835 is a medium-severity vulnerability in projectcapsule capsule, published on 30 Jul 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-65835 exists.

Affected packages and fixed versions:
- github.com/projectcapsule/capsule (Go): affected from 0.13.0; fixed in 0.13.8
- github.com/projectcapsule/capsule (Go): affected from 0.13.0; fixed in 0.13.8
- github.com/projectcapsule/capsule (Go): affected from 0.13.0; fixed in 0.13.8

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-65835/ (Markdown: https://insights.sbomify.com/CVE-2026-65835/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-65835
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-65835
- OSV: https://osv.dev/vulnerability/CVE-2026-65835

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-65835/
Summaries are generated and may contain mistakes; the official description above is the record.