Critical severity · published Aug 19, 2026
CVE-2026-76404
Remote Code Execution (RCE) through Deserialization of Untrusted Data in Splunk MCP Server app
9.1
CVSS
0.7%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
High
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.7% · higher than 55% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
SM
Splunk MCP Server app · Splunk
1.2 before 1.2.1 · source: vendor
MC
Model Context Protocol Server · Splunk
before 1.2.1 · source: NVD