FKIE_CVE-2026-54523

Vulnerability from fkie_nvd - Published: 2026-08-26 15:16 - Updated: 2026-08-26 16:16
Severity
9.6 (Critical) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N
Summary
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
security-advisories@github.comhttps://github.com/kyverno/kyverno/commit/0919553c0ea1904f8d891280c92018da97946a06
security-advisories@github.comhttps://github.com/kyverno/kyverno/commit/5164bcdeda5b57678bc2d7a03ecc2cbb02982dae
security-advisories@github.comhttps://github.com/kyverno/kyverno/pull/16238
security-advisories@github.comhttps://github.com/kyverno/kyverno/releases/tag/v1.18.2
security-advisories@github.comhttps://github.com/kyverno/kyverno/security/advisories/GHSA-79gf-7frw-68m9
security-advisories@github.comhttps://github.com/kyverno/sdk/commit/6573937441443e1ba5af9fbb28d5c0f20297f9df
134c704f-9b21-4f2e-91b3-4a467353bcc0https://github.com/kyverno/kyverno/security/advisories/GHSA-79gf-7frw-68m9
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "kyverno",
          "vendor": "kyverno",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 1.18.0, \u003c 1.18.2"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "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."
    }
  ],
  "id": "CVE-2026-54523",
  "lastModified": "2026-08-26T16:16:27.277",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 9.6,
          "baseSeverity": "CRITICAL",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "CHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 3.1,
        "impactScore": 5.8,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-54523",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-08-26T15:06:17.140283Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-08-26T15:16:48.910",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/kyverno/kyverno/commit/0919553c0ea1904f8d891280c92018da97946a06"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/kyverno/kyverno/commit/5164bcdeda5b57678bc2d7a03ecc2cbb02982dae"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/kyverno/kyverno/pull/16238"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/kyverno/kyverno/releases/tag/v1.18.2"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/kyverno/kyverno/security/advisories/GHSA-79gf-7frw-68m9"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/kyverno/sdk/commit/6573937441443e1ba5af9fbb28d5c0f20297f9df"
    },
    {
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "url": "https://github.com/kyverno/kyverno/security/advisories/GHSA-79gf-7frw-68m9"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Received",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-862"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}



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