Golang
CVE-2026-23990
MEDIUM
GHSA-4xh5-jcj2-ch8q
Severity by source
AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
Primary rating from GitHub Advisory.
CVSS VectorGitHub Advisory
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
Lifecycle Timeline
3DescriptionGitHub Advisory
The Flux Operator is a Kubernetes CRD controller that manages the lifecycle of CNCF Flux CD and the ControlPlane enterprise distribution. Starting in version 0.36.0 and prior to version 0.40.0, 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. In order to be vulnerable, cluster admins must configure the Flux Operator with an OIDC provider that issues tokens lacking the expected claims (e.g., email, groups), or configure custom CEL expressions that can evaluate to empty values. 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. This can result in privilege escalation, data exposure, and/or information disclosure. Version 0.40.0 patches the issue.
AnalysisAI
Flux Operator versions 0.36.0 through 0.39.x contain an authentication bypass in the Web UI that allows authenticated users to escalate privileges and execute API requests with the operator's service account permissions. The vulnerability affects deployments where OIDC providers issue incomplete token claims or custom CEL expressions evaluate to empty values, bypassing Kubernetes RBAC impersonation controls. Cluster administrators running affected Flux Operator versions should upgrade to 0.40.0 or later.
Technical ContextAI
Classified as CWE-269 (Improper Privilege Management). Affects Flux Operator. The Flux Operator is a Kubernetes CRD controller that manages the lifecycle of CNCF Flux CD and the ControlPlane enterprise distribution. Starting in version 0.36.0 and prior to version 0.40.0, 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. In order to be vulnerable, cluster admins must configure the Flux Operator wi
RemediationAI
A vendor patch is available — apply it immediately. Restrict network access to the affected service where possible.
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Same weakness CWE-269 – Improper Privilege Management
View allSame technique Privilege Escalation
View allVendor StatusVendor
SUSE
Severity: MediumShare
External POC / Exploit Code
Leaving vuln.today