CVE-2026-76404 Remote Code Execution (RCE) through Deserialization of Untrusted Data in Splunk MCP Server app
An admin user can execute arbitrary OS commands via unsafe deserialization in the credential management component of the Splunk MCP Server app.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-76404?
CVE-2026-76404 is a critical unsafe deserialization vulnerability in Splunk MCP Server app, published on 19 Aug 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official 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.
Weakness: CWE-502
Which versions are affected by CVE-2026-76404?
It affects 1 product.
Products include Splunk Model Context Protocol Server.
How do I fix CVE-2026-76404?
No fix has been published for CVE-2026-76404 yet. Limit exposure of the affected software until one is available.
Upgrade, and only deserialise data from trusted sources or with an allow-list of types. More about Unsafe deserialization.
Is CVE-2026-76404 being exploited?
There is no known exploitation of CVE-2026-76404 in the wild and no public exploit code.
Sources
Also known as GHSA-3v49-2fcm-3rcj.