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CVE-2026-76404

Remote Code Execution (RCE) through Deserialization of Untrusted Data in Splunk MCP Server app

Published: Aug 19, 2026Updated: Aug 24, 2026 Sources: CVE List NVDCWE-502
9.1CRITICAL
NVD MITRE
EPSS Score
0.6%
Top 55.9%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
Not available

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:HUI:NS:CC:HI:HA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:HPrivileges Required
High
UI:NUser Interaction
None
Scope
S:CScope
Changed
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
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Weaknesses

CWE-502

Affected Products

Splunk
commercial·USaka splunk cloud platform, splunk enterprise
model context protocol serverOn-prem
Security Products / siem-soar
Splunk MCP Server appOn-prem
Security Products / siem-soar

Exploitability

Official Patch Available
Workaround Available
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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

3 techniques
Execution
Initial Access
View detailed technique mapping

References

https://advisory.splunk.com/advisories/SVD-2026-0808
advisory.splunk.com
News mentions
1

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