---
cve: "CVE-2026-54523"
severity: "CRITICAL"
cvss: 9.6
epss: "0.5%"
vendor: "kyverno"
kev: false
exploited: false
published: "2026-08-26 15:16:48"
tags: [cve, security, critical]
source: tsecurity.de CVE-Dossier
exported: "2026-10-01T20:20:32+02:00"
---

# CVE-2026-54523

> 9.6 CRITICAL · 🧪 PoC

## Beschreibung

Kyverno is a policy engine designed for cloud native platform engineering teams. From 1.18.0 until 1.18.2, the NamespacedMutatingPolicy CEL compiler exposes the generator library to matchConditions, allowing a namespace-scoped policy to invoke generator.apply(namespace, resources) with an arbitrary target namespace. The validation in pkg/cel/policies/mpol/validate.go checks that the policy compiles but does not enforce namespace scope, and GenerateResources in pkg/cel/libs/context.go does not reject the cross-namespace target. A user who can create NamespacedMutatingPolicy objects in one namespace can cause the admission controller, operating with cluster-wide privileges, to create ConfigMaps, NetworkPolicies, Secrets, RoleBindings, and other resources in another namespace, enabling unauthorized modification and potential privilege escalation. This issue is fixed in version 1.18.2.

## CISA-Anreicherung (vulnrichment/ADP)

- CISA-SSVC (Coordinator, v2.0.3):
  - Exploitation: **poc**
  - Automatable: **no**
  - Technical Impact: **total**

## CVSS-Vektor

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

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Gering | warn |
| UI Interaktion | Keine | bad |
| S Scope | Verändert | bad |
| C Vertraulichkeit | Hoch | bad |
| I Integrität | Hoch | bad |
| A Verfügbarkeit | Keine | good |

## Patch verfügbar (OSV)

- 0919553c0ea1904f8d891280c92018da97946a06 (Commit)
- 5164bcdeda5b57678bc2d7a03ecc2cbb02982dae (Commit)

## BSI-Hinweise (deutsch)

- [Kyverno: Schwachstelle ermöglicht Privilegieneskalation](https://wid.cert-bund.de/portal/wid/sicherheitshinweis/WID-SEC-W-2026-2280)

## Referenzen

- <https://github.com/kyverno/kyverno/security/advisories/GHSA-79gf-7frw-68m9>
- <https://github.com/kyverno/kyverno/pull/16238>
- <https://github.com/kyverno/kyverno/commit/0919553c0ea1904f8d891280c92018da97946a06>
- <https://github.com/kyverno/kyverno/commit/5164bcdeda5b57678bc2d7a03ecc2cbb02982dae>
- <https://github.com/kyverno/sdk/commit/6573937441443e1ba5af9fbb28d5c0f20297f9df>
- <https://github.com/kyverno/kyverno/releases/tag/v1.18.2>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-54523) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI WID (CSAF)_