CVE-2026-6388 Argocd-image-updater: argocd image updater: cross-namespace privilege escalation via insufficient namespace validation
Attackers with resource creation permissions can bypass namespace boundaries to trigger unauthorized image updates on other tenants' applications.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-6388?
CVE-2026-6388 is a critical vulnerability in Red Hat OpenShift GitOps, published on 15 Apr 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
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.
Weakness: CWE-1220
Which versions are affected by CVE-2026-6388?
How do I fix CVE-2026-6388?
No fix has been published for CVE-2026-6388 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-6388 being exploited?
There is no known exploitation of CVE-2026-6388 in the wild and no public exploit code.
Sources
Also known as GHSA-mx9c-q7m4-fm97.