{"affected":[{"defaultStatus":"unaffected","ecosystem":"golang","packageName":"github.com/kyverno/kyverno","product":"kyverno","source":"CNA: VulnCheck","vendor":"kyverno","versions":[{"lessThan":"1.19.2","status":"affected","version":"1.17.0","versionType":"semver"},{"status":"unaffected","version":"1.19.2","versionType":"semver"}]}],"cveId":"CVE-2026-122303","cwes":["CWE-862"],"description":"Kyverno from 1.17.0 before 1.19.2 contains an authorization bypass vulnerability that allows namespace tenants to overwrite resources in other namespaces via NamespacedMutatingPolicy mutate-existing targetMatchConstraints.expression. Attackers can return a CEL map literal fabricating a target with an attacker-chosen metadata.namespace, causing the privileged background controller to overwrite Secrets, Deployments, or policies cluster-wide.","epss":null,"exploits":[],"kev":null,"metrics":[{"score":9.4,"severity":"critical","source":"CNA: VulnCheck","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H","version":"4.0"},{"score":9.9,"severity":"critical","source":"CNA: VulnCheck","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","version":"3.1"}],"modifiedAt":1793845508280,"publishedAt":1793845508280,"references":[{"source":"CNA: VulnCheck","tags":["vendor-advisory"],"url":"https://github.com/kyverno/kyverno/security/advisories/GHSA-jcw5-3wcg-fqx5"},{"source":"CNA: VulnCheck","tags":["third-party-advisory"],"url":"https://www.vulncheck.com/advisories/kyverno-1.17.0-before-1.19.2-cross-namespace-resource-overwrite-via-namespacedmutatingpolicy"}],"remediation":[],"revision":"2ab1866401e032ef7ebe03b9cd8064c63a72b986a476c07f10fdad7ac033ca56","sources":[{"modifiedAt":1793845508280,"name":"CNA: VulnCheck","retrievedAt":1793848152989,"url":"https://www.cve.org/CVERecord?id=CVE-2026-122303"}],"ssvc":null,"status":"published","title":"Kyverno 1.17.0 before 1.19.2 Cross-Namespace Resource Overwrite via NamespacedMutatingPolicy","updatedAt":1793848152989}