{"description":"Trending threats, MITRE ATT\u0026CK coverage, and detection metadata — refreshed continuously.","feed_url":"https://feed.craftedsignal.io/tags/argocd/","home_page_url":"https://feed.craftedsignal.io/","items":[{"_cs_actors":[],"_cs_cves":[{"cvss":9.1,"id":"CVE-2026-6388"}],"_cs_exploited":false,"_cs_products":[],"_cs_severities":["critical"],"_cs_tags":["argocd","privilege-escalation","kubernetes","cve-2026-6388"],"_cs_type":"advisory","_cs_vendors":[],"content_html":"\u003cp\u003eCVE-2026-6388 is a critical vulnerability affecting ArgoCD Image Updater. This flaw allows an attacker who has the ability to create or modify ImageUpdater resources within a multi-tenant ArgoCD environment to bypass namespace boundaries. By exploiting insufficient validation within the Image Updater, an attacker can trigger image updates for applications residing in different namespaces, effectively escalating privileges across tenant boundaries. This unauthorized modification of application images can lead to compromised application integrity and potentially introduce malicious code into the targeted environments. The vulnerability was reported on 2026-04-15. Defenders must ensure proper access control and validation mechanisms are in place to mitigate the risk of exploitation.\u003c/p\u003e\n\u003ch2 id=\"attack-chain\"\u003eAttack Chain\u003c/h2\u003e\n\u003col\u003e\n\u003cli\u003eAttacker gains access to an ArgoCD account with permissions to create or modify ImageUpdater resources.\u003c/li\u003e\n\u003cli\u003eAttacker crafts a malicious ImageUpdater resource that targets an application in a different namespace.\u003c/li\u003e\n\u003cli\u003eThe malicious ImageUpdater resource specifies a container image to be updated.\u003c/li\u003e\n\u003cli\u003eArgoCD Image Updater processes the malicious ImageUpdater resource.\u003c/li\u003e\n\u003cli\u003eDue to insufficient validation, the Image Updater bypasses namespace boundaries.\u003c/li\u003e\n\u003cli\u003eThe Image Updater triggers an update to the target application\u0026rsquo;s container image in the other namespace.\u003c/li\u003e\n\u003cli\u003eThe target application is now running with the attacker-controlled container image.\u003c/li\u003e\n\u003cli\u003eThe attacker achieves cross-namespace privilege escalation and compromises the target application\u0026rsquo;s integrity.\u003c/li\u003e\n\u003c/ol\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eSuccessful exploitation of CVE-2026-6388 allows an attacker to perform unauthorized image updates across namespaces in a multi-tenant ArgoCD environment. This leads to cross-namespace privilege escalation, enabling attackers to compromise applications managed by other tenants. The compromised applications may be used to conduct further attacks, steal sensitive data, or cause disruption. The severity is considered critical due to the potential for widespread impact and the relative ease of exploitation for attackers with the required permissions.\u003c/p\u003e\n\u003ch2 id=\"recommendation\"\u003eRecommendation\u003c/h2\u003e\n\u003cul\u003e\n\u003cli\u003eImplement strict Role-Based Access Control (RBAC) policies within ArgoCD to limit the ability of users to create or modify ImageUpdater resources (reference: Overview section).\u003c/li\u003e\n\u003cli\u003eDeploy the provided Sigma rule to detect suspicious ImageUpdater resource modifications targeting multiple namespaces (reference: rules section).\u003c/li\u003e\n\u003cli\u003eThoroughly review and harden the ImageUpdater validation logic to prevent namespace bypass (reference: CVE-2026-6388).\u003c/li\u003e\n\u003cli\u003eMonitor ArgoCD logs for any attempts to create or modify ImageUpdater resources from unusual or unauthorized sources (reference: rules logsource).\u003c/li\u003e\n\u003c/ul\u003e\n","date_modified":"2026-04-15T22:17:22Z","date_published":"2026-04-15T22:17:22Z","id":"/briefs/2026-04-argocd-privesc/","summary":"CVE-2026-6388 describes a flaw in ArgoCD Image Updater that allows an attacker with permissions to create or modify an ImageUpdater resource in a multi-tenant environment to bypass namespace boundaries and trigger unauthorized image updates.","title":"ArgoCD Image Updater Namespace Bypass Vulnerability (CVE-2026-6388)","url":"https://feed.craftedsignal.io/briefs/2026-04-argocd-privesc/"}],"language":"en","title":"CraftedSignal Threat Feed — Argocd","version":"https://jsonfeed.org/version/1.1"}