CVE-2026-6388
Cross-namespace privilege escalation via ArgoCD Image Updater.
Is CVE-2026-6388 being exploited?
Not confirmed. CVE-2026-6388 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.36% probability of exploitation in the next 30 days.
How severe is CVE-2026-6388?
CVE-2026-6388 is rated Critical with a CVSS score of 9.1. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-6388?
Not known from our data. No patch reference has been recorded for CVE-2026-6388, which is not the same as no patch existing — a fix may have shipped without a tagged reference, or after this record was written. The vendor advisory is the only authority on whether a fix exists, and mitigations may be available regardless.
What does CVE-2026-6388 affect?
CVE-2026-6388 affects ArgoCD Image Updater. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-6388?
Limit ImageUpdater permissions; apply vendor patch when released.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Bypasses namespace checks to perform unauthorized image updates across tenants in multi-tenant deployments.
Immediate action required