Remote Code Execution (RCE) through Deserialization of Untrusted Data in Splunk MCP Server app
Priority MEDIUM 43CWE-502Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- High
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Code execution
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-502.
Summary
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.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00749 55th percentileScored 2026-11-07
Fix Fixed Splunk MCP Server app (Splunk): 1.2.1
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
Remediation
- Fix · CNA Splunk MCP Server app (Splunk) Fixed in 1.2.1
Timeline
- 2026-10-02 Threatist record created from CVE-2026-76404
- 2026-10-03 Alias added: GHSA-3v49-2fcm-3rcj
References
Sources
- CVE-2026-76404 · CVE Program
- CVE-2026-76404 · NVD
- FIRST EPSS
- GHSA-3v49-2fcm-3rcj · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences