Description

In Splunk MCP Server app versions below 1.2.1, a user who holds the "admin" Splunk role could execute arbitrary commands on the underlying operating system. The vulnerability is possible because of missing input validation in the app's credential management component, which deserializes stored data without checking whether the content is of the expected type.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "9.1",
  "pubDate": "2026-08-19T22:17:27.170Z",
  "pubdate": "2026-08-19T22:17:27.170Z",
  "executiveSummary": "An arbitrary command execution vulnerability exists in the Splunk MCP Server app in versions below 1.2.1. The flaw resides within the application's credential management component, which improperly handles the deserialization of stored data without performing adequate input validation or type verification.\nSuccessful exploitation of this vulnerability allows an authenticated attacker holding the \"admin\" Splunk role to execute arbitrary operating system commands on the underlying host infrastructure. This presents a critical risk to confidentiality, integrity, and availability, as the execution of system-level commands can lead to complete host compromise.\nThe primary requirement for successful exploitation is administrative privilege within the Splunk platform, specifically possession of the \"admin\" role, enabling the manipulation or triggering of the insecure deserialization mechanism within the credential management subsystem.\nOrganizations utilizing the affected software face severe operational risks if compromised, as attackers with administrative access can leverage this vulnerability to pivot deeper into the network, deploy persistent malware, or manipulate sensitive configuration data across the host environment.",
  "technicalDetails": "The root cause of the vulnerability is insecure deserialization combined with a lack of rigorous input validation within the credential management component of the Splunk MCP Server app. When processing stored data, the application fails to verify whether the incoming content conforms to the expected data type before initiating the deserialization routine.\nThe vulnerable component is the credential management subsystem of the Splunk MCP Server app, impacting all versions prior to 1.2.1. Exploitation requires authentication and specific privilege requirements, specifically holding the \"admin\" Splunk role within the deployment.\nThe attack flow proceeds as follows: First, an authenticated user possessing the \"admin\" Splunk role interacts with the credential management functionality. Second, the attacker supplies crafted serialized data designed to leverage the insecure deserialization flaw. Third, because the application lacks proper input validation and type checking, it processes the untrusted stream during the deserialization phase.\nAs a direct consequence of the unsafe instantiation and processing of the deserialized payload, the underlying operating system executes arbitrary commands supplied by the attacker. The post-exploitation impact includes full control over the underlying operating system host, enabling the execution of arbitrary system binaries, unauthorized data access, privilege escalation, and lateral movement across interconnected systems."
}