CVE-2026-76404

CRITICAL CVSS 3.1: 9.1 EPSS 0.56%
Updated Aug 24, 2026
Splunk
Parameter Value
CVSS 9.1 (CRITICAL)
Affected Versions before 1.2.1
Fixed In 1.2.1
Type CWE-502 (Deserialization of Untrusted Data)
Vendor Splunk
Public PoC No

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.

Attack Parameters

Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Privileges Required
High
Admin privileges needed
User Interaction
None
No user interaction needed

Impact Assessment

Confidentiality
High
Complete data leak
Integrity
High
Complete data modification
Availability
High
Complete denial of service

CVSS Vector v3.1

Vulnerable Products 1

Configuration From (including) Up to (excluding)
Splunk Model_Context_Protocol_Server
cpe:2.3:a:splunk:model_context_protocol_server:*:*:*:*:*:*:*:*
1.2.1