Unauthenticated Remote Code Execution in Argo CD Repo-Server

A flaw was identified in Argo CD, the GitOps engine used by Red Hat OpenShift GitOps, that could allow an unauthenticated attacker with network access to the Argo CD repo-server to achieve remote code execution. Under certain conditions, the attacker may then manipulate cached data to deploy malicious Kubernetes resources to managed clusters, potentially resulting in complete cluster compromise.

Casky was already ahead

This CVE exploits attack patterns that Casky's 283matched skills already investigate — long before this vulnerability was disclosed. Claude's reasoning model maps these techniques to MITRE ATT&CK, so practitioners who ran these skills have already seen the threat behaviour in their findings.

Analysis

CVE-2026-15416 represents a critical vulnerability in Argo CD's repo-server component that allows unauthenticated attackers to execute arbitrary code through network access alone. This flaw is particularly dangerous because Argo CD serves as the GitOps engine for Kubernetes cluster management in Red Hat OpenShift GitOps environments. Organizations using Argo CD for continuous deployment are at immediate risk, as successful exploitation enables attackers to not only compromise the Argo CD infrastructure but also manipulate cached deployment data to inject malicious Kubernetes resources across managed clusters. The potential for complete cluster compromise makes this a severe threat to any organization relying on GitOps-based infrastructure automation.

Casky's 283 matched skills detect the attack chain underlying this vulnerability by mapping to MITRE ATT&CK techniques TA0004 (Privilege Escalation) and TA0006 (Credential Access). Using Claude's extended reasoning capabilities, practitioners would observe detection patterns for unauthenticated network exploitation attempts against repo-server endpoints, followed by code execution indicators and lateral movement signatures as attackers manipulate cached artifacts for cluster-wide resource deployment. The platform's skill mapping enables practitioners to identify initial access vectors (missing authentication controls under CWE-306), suspicious process execution on Argo CD nodes, unusual Git repository access patterns, and malicious Kubernetes manifest deployment activities—allowing security teams to distinguish this CVE's exploitation from legitimate GitOps operations and respond before cluster compromise occurs.

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Casky Risk Score

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EPSS Probability

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Shodan Exposure

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GreyNoise Signal

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Composite risk scoring from EPSS, CISA KEV, Shodan, and GreyNoise — 21 security APIs correlated into a single Casky Risk Score. Coming in Casky Pro. Join early access →

283 Casky skills cover this attack pattern

These skills use Claude AI's reasoning model to surface findings in the same attack categories as CVE-2026-15416.

abusing-dpapi-for-credential-access

red teaming · high

Run

abusing-shadow-credentials-for-privesc

red teaming · high

Run

Access with Stolen Session Cookie

identity access management · low

Run

MITRE ATT&CK Techniques

TA0004 TA0006

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