Rule Document 1:66503

Report a false positive

Rule Category

POLICY-OTHER --

Alert Message

POLICY-OTHER ArgoCD Kubernetes ServerSideDiff potential secrets disclosure attempt

Rule Explanation

This rule looks for traffic to ArgoCD web applications' ServerSideDiff endpoint that contains objects of kind "Secret".

What To Look For

This rule alerts on attempts to perform a ServerSideDiff on sensitive information via ArgoCD web applications.

Known Usage

Public information/Proof of Concept available

False Positives

No known false positives

Contributors

Cisco Talos Intelligence Group

Rule Groups

Rule Categories::Server::Web Applications

MITRE::ATT&CK Framework::Enterprise::Initial Access::Exploit Public-Facing Application

Adversaries may attempt to take advantage of a weakness in an Internet-facing computer or program using software, data, or commands in order to cause unintended or unanticipated behavior. The weakness in the system can be a bug, a glitch, or a design vulnerability. These applications are often websites, but can include databases (like SQL), standard services (like SMB or SSH), network device administration and management protocols (like SNMP and Smart Install), and any other applications with Internet accessible open sockets, such as web servers and related services.

Vulnerability::Severity::High

Vulnerability::Severity::Critical

CVE

CVE-2026-42880

Additional Links

github.com/advisories/GHSA-3v3m-wc6v-x4x3

Rule Vulnerability

Information Leak

Information Leakage happens when an attacker manipulates a system into revealing sensitive information, either through malformed input or by taking advantage of another feature of the system.

CVE Additional Information

This product uses data from the NVD API but is not endorsed or certified by the NVD.

CVE-2026-42880

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