CVE-2026-76286
MEDIUM 5.3In Splunk MCP Server versions below 1.2.1, Splunk MCP Server could send the Splunk platform authentication token of a user who runs a custom Application Programming Interface (API) tool to the URL configured for that tool. If another user controls that URL, they could capture the token and use it to access data and perform actions as the user who ran the tool. Successful exploitation requires a user who holds a role that contains the mcp_tool_execute capability to run a custom API tool configured by another user. For more information see Configure the Splunk MCP Server (https://help.splunk.com/en/splunk-enterprise/mcp-server-for-splunk-platform/1.2/configure-the-splunk-mcp-server) and Managing custom tools in Splunk MCP Server (https://help.splunk.com/en/splunk-enterprise/mcp-server-for-splunk-platform/1.2/managing-custom-tools-in-splunk-mcp-server) in the Splunk documentation.
No known exploitation, public exploit, or elevated probability at this time. Track for changes.
Exploitation likelihood
0.2%chance of exploitation in 30 days · 7th percentile
Impact if exploited
5.3CVSS 3.1 · MEDIUM
- ConfidentialityHigh
- IntegrityLow
- AvailabilityLow
What an attacker needs
- ✓Access: Reachable over the network — no local access needed
- ⚠Privileges: Requires an admin / high-privilege account
- ⚠User interaction: A user must take an action (click / open a file)
- ⚠Complexity: Needs a race window or specific setup
✓ lowers the bar for an attacker · ⚠ raises it
Proof of concept
No public PoC is currently catalogued.
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Data snapshot:
Weakness (CWE)
- CWE-918: The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:H/I:L/A:L
References and research data (JSON)
All CVSS metrics
- MEDIUM 5.3 v3.1 · CNA Primary
CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:H/I:L/A:L - MEDIUM 5.3 v3.1 · NVD Secondary
CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:H/I:L/A:L
References
Advisories
- https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-94587 EUVD · EUVD-2026-94587
Technical & other
- https://advisory.splunk.com/advisories/SVD-2026-1004CVE record · cisco · Updated 2026-10-07T20:46:40.297Z
NVD · CVE-2026-76286 · Updated 2026-10-08T20:08:45.857