CVE-2026-6388: Argocd-image-updater: argocd image updater: cross-namespace privilege escalation via insufficient namespace validation
A flaw was found in ArgoCD Image Updater. This vulnerability allows an attacker, with permissions to create or modify an ImageUpdater resource in a multi-tenant environment, to bypass namespace boundaries. By exploiting insufficient validation, the attacker can trigger unauthorized image updates on applications managed by other tenants. This leads to cross-namespace privilege escalation, impacting application integrity through unauthorized application updates.
Affected Software
Event History
Frequently Asked Questions
What is the severity of CVE-2026-6388?
CVE-2026-6388 has been classified with a severity rating that indicates a significant risk due to potential privilege escalation.
How does CVE-2026-6388 affect multi-tenant Argo CD Image Updater environments?
CVE-2026-6388 allows an attacker with limited permissions to escalate privileges across different namespaces in a multi-tenant environment.
What are the recommended steps to patch CVE-2026-6388?
To mitigate CVE-2026-6388, ensure to apply the latest updates from ArgoCD Image Updater that address the insufficient namespace validation.
What kind of attack can be executed using CVE-2026-6388?
An attacker could exploit CVE-2026-6388 to create or modify resources in unauthorized namespaces, leading to privilege escalation.
Is there a workaround available for CVE-2026-6388?
Currently, there is no documented workaround for CVE-2026-6388; updating to a fixed version is the advised course of action.