Missing Authorization Affecting kyverno-background-controller-1.18 package, versions <1.18.2-r0
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
Do your applications use this vulnerable package?
In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.
Test your applications- Snyk IDSNYK-MINIMOSLATEST-KYVERNOBACKGROUNDCONTROLLER118-19385644
- published28 Aug 2026
- disclosed26 Aug 2026
Introduced: 26 Aug 2026
NewCVE-2026-54523 (opens in a new tab)How to fix?
Upgrade Minimos:latest kyverno-background-controller-1.18 to version 1.18.2-r0 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kyverno-background-controller-1.18 package and not the kyverno-background-controller-1.18 package as distributed by Minimos.
See How to fix? for Minimos:latest relevant fixed versions and status.
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.
References
- https://www.cve.org/CVERecord?id=CVE-2026-54523
- https://github.com/advisories/GHSA-79gf-7frw-68m9
- https://osv.dev/vulnerability/MINI-vc7g-jm2r-88hj
- https://osv.dev/vulnerability/CVE-2026-54523
- https://github.com/kyverno/kyverno/commit/0919553c0ea1904f8d891280c92018da97946a06
- https://github.com/kyverno/kyverno/commit/5164bcdeda5b57678bc2d7a03ecc2cbb02982dae
- https://github.com/kyverno/kyverno/pull/16238
- https://github.com/kyverno/kyverno/releases/tag/v1.18.2
- https://github.com/kyverno/sdk/commit/6573937441443e1ba5af9fbb28d5c0f20297f9df
- https://github.com/kyverno/kyverno/security/advisories/GHSA-79gf-7frw-68m9