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CVE-2026-76404— Remote Code Execution (RCE) through Deserialization of Untrusted Data in Splunk MCP Server app

Quick assessment

Affected
Splunk Splunk MCP Server app
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Splunk MCP Server app是美国Splunk公司的一款连接AI模型与数据平台的服务器应用。 Splunk MCP Server app 1.2.1之前版本存在反序列化注入漏洞，该漏洞源于应用的凭据管理组件缺少输入验证，反序列化存储数据时未检查内容是否为预期类型，可能导致具有admin Splunk角色的用户在底层操作系统上执行任意命令。

CVSS 9.1 · Critical EPSS 0.56% · P44

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
Splunk Splunk MCP Server app 1.2< 1.2.1 affected
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I. Basic Information for CVE-2026-76404

Vulnerability Information
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Vulnerability Title
Remote Code Execution (RCE) through Deserialization of Untrusted Data in Splunk MCP Server app
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
可信数据的反序列化
Source: CVE Program / CVE List V5
Vulnerability Title
Splunk MCP Server app 反序列化注入漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Splunk MCP Server app是美国Splunk公司的一款连接AI模型与数据平台的服务器应用。 Splunk MCP Server app 1.2.1之前版本存在反序列化注入漏洞，该漏洞源于应用的凭据管理组件缺少输入验证，反序列化存储数据时未检查内容是否为预期类型，可能导致具有admin Splunk角色的用户在底层操作系统上执行任意命令。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Splunk Splunk MCP Server app 1.2 ~ 1.2.1 -

II. Public POCs for CVE-2026-76404

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III. Intelligence Information for CVE-2026-76404

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Vendor Advisories for CVE-2026-76404 (1)

Same Patch Batch · Splunk · 2026-08-19 · 110 CVEs total

CVE-2026-76310 9.4 CRITICAL Improper Access Control through Embedded Report REST API Requests in Splunk Enterprise
CVE-2026-76311 9.4 CRITICAL Improper Access Control in Embedded Report Dispatch Archives in Splunk Enterprise
CVE-2026-76312 9.4 CRITICAL Improper Access Control through Embedded Reports in Splunk Enterprise
CVE-2026-76335 8.8 HIGH Remote Code Execution (RCE) through Splunk Web Manager Configuration in Splunk Enterprise
CVE-2026-76317 8.8 HIGH Path Traversal through the Lookup Configuration REST API in Splunk Enterprise
CVE-2026-76389 8.8 HIGH Server-Side Request Forgery (SSRF) through the REST API in Cisco Talos Intelligence for En
CVE-2026-76350 8.8 HIGH Improper Privilege Management through PDF Attachments for Email Alert Actions in Splunk En
CVE-2026-76319 8.8 HIGH Remote Code Execution (RCE) through Federated Search in Splunk Enterprise
CVE-2026-76259 8.8 HIGH Improper Privilege Management on the Management Port in Splunk Enterprise for Windows
CVE-2026-76351 8.8 HIGH Server-Side Request Forgery (SSRF) through the Report Notification REST API in Splunk Secu
CVE-2026-76314 8.8 HIGH Remote Code Execution (RCE) through Splunk Web Manager Configuration in Splunk Enterprise
CVE-2026-76395 8.8 HIGH Remote Code Execution (RCE) through Deserialization of Untrusted Data in the Model Loading
CVE-2026-76316 8.8 HIGH Stored SPL Injection through Deployment Server Broker Registration in Splunk Enterprise
CVE-2026-76352 8.8 HIGH Improper Authorization through the REST API in Splunk Enterprise
CVE-2026-76313 8.8 HIGH Remote Code Execution (RCE) through the REST API in Splunk Enterprise
CVE-2026-76253 8.8 HIGH Privilege Escalation through Scheduled Search Alert Action Configuration in Splunk Enterpr
CVE-2026-76315 8.8 HIGH Code Injection through Splunk Web Manager Configuration in Splunk Enterprise
CVE-2026-76391 8.3 HIGH Improper Privilege Management through Agent Run History in Splunk AI Toolkit
CVE-2026-76394 8.3 HIGH Missing Authorization in Container and Connection Management through the REST API in Splun
CVE-2026-76402 8.2 HIGH Server-Side Request Forgery (SSRF) through the REST API in Splunk Connect for Kafka

Showing top 20 of 110 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same vendor: Splunk
Same weakness: CWE-502

V. Comments for CVE-2026-76404

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