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Go package

github.com/controlplaneio-fluxcd/flux-operator

Open actionable advisories and recorded vendor fixes. This public package view has no inventory attached and cannot establish whether your deployment is affected. A vendor fix never resolves your finding; verify your installed version and the source guidance.

Open advisories

1 actionable advisory, newest first. Withdrawn advisories and news are excluded. Coverage is partial.

  1. Medium, CVSS 5.3GoPublished

    Flux Operator Web UI Impersonation Bypass via Empty OIDC Claims

    CVE-2026-23990 · GHSA-4xh5-jcj2-ch8q

    Affected
    • Go github.com/controlplaneio-fluxcd/flux-operator >= 0.36.0, < 0.40.0
    Fixed in
    0.40.0· Vendor fix available
    Issue
    A privilege escalation vulnerability exists in the Flux Operator Web UI authentication code that allows an attacker to bypass Kubernetes RBAC impersonation and execute API requests with the operator's service account privileges. After OIDC token claims are processed through CEL expressions, there is no validation that the resulting username and groups values are non-empty. When both values are empty, the Kubernetes client-go library does not add impersonation headers to API requests, causing them to be executed with the flux-operator service account's credentials instead of the authenticated user's limited permissions. Impact - Privilege Escalation: Any authenticated user can escalate to operator-level read permissions and perform suspend/resume/reconcile actions - Data Exposure: Unauthorized read access to Flux resources across all namespaces, bypassing RBAC restrictions - Information Disclosure: View sensitive GitOps pipeline configurations, source URLs, and deployment status…

    Recommended action: Upgrade to 0.40.0 or later, then redeploy and verify.A vendor fix does not resolve your finding until you verify it in your own systems.

    Sources:github.comSource checked Evidence →