CVE-2026-6388
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedA 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.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · moderate confidenceArgoCD Image Updater has insufficient namespace boundary validation that allows attackers with permissions to create or modify ImageUpdater resources to bypass namespace isolation in multi-tenant environments, enabling cross-namespace privilege escalation and unauthorized image updates on applications managed by other tenants.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- Low
- Privileges
- Low
- User interaction
- None
- Scope
- Changed
- Confidentiality
- Low
- Integrity
- High
- Availability
- Low
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:H/A:L
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Identify if ArgoCD Image Updater is installedRun 'kubectl get pods -A | grep -i argocd-image-updater' or check for the argocd-image-updater deployment in any namespaceAffected if No ArgoCD Image Updater pods or deployments found means the product is not present
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Verify ImageUpdater CRD existsRun 'kubectl get crd | grep -i imageupdater' to confirm the custom resource definition is registeredAffected if No ImageUpdater CRD indicates the vulnerable custom resource type is not in use
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List all ImageUpdater resources in the clusterRun 'kubectl get imageupdater -A' or 'kubectl get imageupdater --all-namespaces' to see all instances across namespacesAffected if No ImageUpdater resources exist means the attack surface is not present
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Check for cross-namespace ImageUpdater referencesReview each ImageUpdater resource's spec: run 'kubectl get imageupdater -A -o yaml' and inspect the 'applications' or 'applicationsets' fields for references to namespaces different from where the ImageUpdater residesAffected if ImageUpdater in namespace A references applications in namespace B (where A != B)
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Inspect RBAC for ImageUpdater permissionsRun 'kubectl auth can i create imageupdater' and review ClusterRole/Role bindings that grant create/modify permissions on ImageUpdater resources to non-admin usersAffected if Tenants or non-privileged users have create/modify permissions on ImageUpdater resources across multiple namespaces
A user is affected if ArgoCD Image Updater is installed AND ImageUpdater resources exist that reference applications in namespaces other than their own, allowing cross-tenant modification.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
From vendor dataApply proper namespace boundary validation to ensure ImageUpdater resources can only affect applications within their own namespace, and review RBAC policies to restrict ImageUpdater permissions appropriately in multi-tenant setups.
- Consultation3.0 h
- Implementation6.0 h
- Testing3.0 h
- Review / QA2.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2026-6388 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2026-6388 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
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- Version or environment caveats, and links to real fixes
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