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0 CVE-2026-23990 is a medium-severity privilege escalation vulnerability in the Flux Operator versions 0.36.0 to before 0.40.0. It arises from improper privilege management in the Web UI authentication code when configured with certain OIDC providers issuing tokens missing expected claims or with custom CEL expressions that yield empty username and groups values. This causes Kubernetes client-go to omit impersonation headers, resulting in API requests executing with the operator's service account privileges rather than the limited authenticated user permissions. Exploitation can lead to privilege escalation and data exposure within Kubernetes clusters using the affected Flux Operator versions. The vulnerability is patched in version 0.40. Join the discussion | CVE Database V5 | 01/21/2026, 22:25:57 UTC Added: 01/21/2026, 22:50:56 UTC |
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