CVE-2026-62290 cert-manager: Direct ACME Challenge resources can bypass Issuer DNS01 solver policy and use ClusterIssuer DNS credentials

cert-manager adds certificates and certificate issuers as resource types in Kubernetes clusters, and simplifies the process of obtaining, renewing and using those certificates. From 1.18.0 until 1.19.6 and 1.20.3, Challenge resources under acme.cert-manager.io can be created directly by namespace...

CVE-2026-62290

Affected software/area: cert-manager in Kubernetes clusters (certificates and issuers as resources). Vulnerability: Between 1.18.0 and 1.19.6, and 1.20.3, Challenge resources under acme.cert-manager.io could be created by namespace users without admission validation, allowing attacker-controlled ...