Red Hat has disclosed a critical privilege escalation flaw in OpenShift GitOps that permits authenticated namespace administrators to gain root-level access across entire Kubernetes clusters.
The vulnerability, tracked as CVE-2025-13888, enables attackers to manipulate the system’s permission model and deploy privileged workloads on master nodes, resulting in complete cluster compromise.
Vulnerability Overview
The flaw resides in how OpenShift GitOps processes ArgoCD Custom Resources (CRs).
Namespace administrators can craft malicious CRs that trick the system into granting them elevated permissions beyond their authorized scope, extending access into privileged namespaces they would not otherwise be able to access.
Once obtained, attackers can create and execute privileged workloads that run directly on master nodes, effectively granting them root access to the entire cluster infrastructure.
This vulnerability is classified as CWE-266 (Incorrect Privilege Assignment), highlighting a fundamental flaw in how the system validates and assigns permissions to user roles across the platform.
Red Hat’s Assessment
Red Hat has assigned an Important severity rating to this vulnerability rather than Critical, assigning it a CVSS v3 Base Score of 9.1.
The rationale for this classification is based on attack-surface limitations. While full cluster compromise is technically achievable, the threat is primarily constrained to authenticated internal users who already possess namespace administrator credentials.
This distinction reduces the risk profile relative to vulnerabilities that external, unauthenticated attackers can exploit.
The attack vector is classified as network-based with Low Attack Complexity, meaning once an attacker gains the initial namespace admin credentials, exploitation requires minimal additional effort.
The flaw’s scope has changed, indicating that its impacts extend beyond the original authorization boundaries, and all three impact categories, Confidentiality, Integrity, and Availability, are rated High.
Red Hat has released security patches across multiple OpenShift GitOps versions. The fixes were deployed on December 15, 2025, through the following security errata:
- OpenShift GitOps 1.16: Fixed via RHSA-2025:23207
- OpenShift GitOps 1.17: Fixed via RHSA-2025:23206
- OpenShift GitOps 1.18: Fixed via RHSA-2025:23203
Organizations running earlier versions of these affected releases should assume they remain vulnerable unless Red Hat explicitly states otherwise.
Administrators are urged to prioritize patching systems with namespace administrators who have internal or contractor access.
Organizations should immediately apply available security patches to all affected OpenShift GitOps deployments.
Additionally, administrators should review namespace administrator access policies and implement the principle of least privilege controls where feasible.
Monitoring ArgoCD Custom Resource creation and modifications for suspicious patterns may help detect exploitation attempts before they escalate to cluster compromise.
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