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Vulnerability record · CVE-2026-54523 · published 26 August 2026

CVE-2026-54523: Missing authorization vulnerability

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.

9.6 CVSS 3.1 Critical EPSS 0.47% · top 62.2% CWE-862 · Missing authorization Deferred
9.6CVSS 3.1 base score
0.47%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
7References
9 Sep 2026Last modified by NVD

Description

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.

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

References

LinkTags
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/kyverno/security/advisories/GHSA-79gf-7frw-68m9
https://github.com/kyverno/sdk/commit/6573937441443e1ba5af9fbb28d5c0f20297f9df
https://github.com/kyverno/kyverno/security/advisories/GHSA-79gf-7frw-68m9

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Source: NIST National Vulnerability Database (record CVE-2026-54523), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.