CVE-2026-76404 json
Remote Code Execution (RCE) through Deserialization of Untrusted Data in Splunk MCP Server app
published 2026-08-19 2 mo ago modified 2026-10-24 15 d ago also EUVD-2026-62969
- cvss
- 9.1
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.7%
- EPSS 0.7% chance of exploitation in 30 days, percentile 55%
- public exploits
- 0
- none known
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.
Patch / fix
- Splunk Splunk MCP Server app 1.2.1
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- total
- Assessed
- 2 mo ago
Exploit prediction
0.75% chance of exploitation in the next 30 days, higher than 55% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 9.1 | CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H |
Affected products
- Splunk Splunk MCP Server app
Classification
- Weakness
-
- CWE-502 Deserialization of Untrusted Data
References
-
advisory.splunk.com
/advisories/SVD-2026-0808
vendor-advisory
Sources
- CVE List CVE-2026-76404
- NVD CVE-2026-76404
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.