CVE-2026-20205 Sensitive Information Disclosure in ''_internal'' index in Splunk MCP Server app
Privileged users can view session and authorization tokens in clear text within the internal index, potentially leading to account takeover.
- 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-2026-20205?
CVE-2026-20205 is a high-severity vulnerability in Splunk MCP Server, published on 15 Apr 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official description
In Splunk MCP Server app versions below 1.0.3 , a user who holds a role with access to the Splunk `_internal` index or possesses the high-privilege capability `mcp_tool_admin` could view users session and authorization tokens in clear text.<br><br>The vulnerability would require either local access to the log files or administrative access to internal indexes, which by default only the admin role receives. <br><br>Review roles and capabilities on your instance and restrict internal index access to administrator-level roles. See [Define roles on the Splunk platform with capabilities](https://docs.splunk.com/Documentation/Splunk/latest/Security/Rolesandcapabilities) and [Connecting to MCP Server and Admin settings](https://help.splunk.com/en/splunk-enterprise/mcp-server-for-splunk-platform/connecting-to-mcp-server-and-admin-settings) in the Splunk documentation for more information.
Weakness: CWE-532
Which versions are affected by CVE-2026-20205?
How do I fix CVE-2026-20205?
No fix has been published for CVE-2026-20205 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-20205 being exploited?
There is no known exploitation of CVE-2026-20205 in the wild and no public exploit code.
Sources
Also known as GHSA-6qfc-m9fp-c5rm.