{"id":"CVE-2026-20205","state":"PUBLISHED","title":"Sensitive Information Disclosure in ''_internal'' index in Splunk MCP Server app","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.","publishedAt":"2026-04-15T15:17:58.202Z","updatedAt":"2026-04-15T17:39:19.517Z","severity":{"score":7.2,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H","source":"cisco"},"assigner":"cisco","products":["Splunk Splunk MCP Server"],"affected":[{"vendor":"Splunk","product":"Splunk MCP Server","versions":[{"version":"1.0","status":"affected","lessThan":"1.0.3","versionType":"custom"}]}],"references":["https://advisory.splunk.com/advisories/SVD-2026-0407"],"weaknesses":["CWE-532"],"ingestedAt":"2026-10-29T20:11:10.572Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/20xxx/CVE-2026-20205.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-20205","state":"PUBLISHED","datePublished":"2026-04-15T15:17:58.202Z","dateUpdated":"2026-04-15T17:39:19.517Z","assignerShortName":"cisco","assignerOrgId":"d1c1063e-7a18-46af-9102-31f8928bc633","dateReserved":"2025-10-08T11:59:15.397Z"},"containers":{"cna":{"title":"Sensitive Information Disclosure in ''_internal'' index in Splunk MCP Server app","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"Splunk","product":"Splunk MCP Server","versions":[{"version":"1.0","status":"affected","lessThan":"1.0.3","versionType":"custom"}]}],"references":[{"url":"https://advisory.splunk.com/advisories/SVD-2026-0407"}],"metrics":[{"cvssV3_1":{"vectorString":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H","version":"3.1","baseScore":7.2,"baseSeverity":"HIGH"},"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}]}],"problemTypes":[{"descriptions":[{"cweId":"CWE-532","lang":"en","type":"cwe","description":"Information written to log files can be of a sensitive nature and give valuable guidance to an attacker or expose sensitive user information."}]}],"providerMetadata":{"shortName":"cisco","orgId":"d1c1063e-7a18-46af-9102-31f8928bc633","dateUpdated":"2026-04-15T15:17:58.202Z"},"datePublic":"2026-04-15T00:00:00.000Z","source":{"advisory":"SVD-2026-0407"},"credits":[{"lang":"en","value":"Charlie Huggard, Splunk"}]},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-04-15T17:39:12.967528Z","id":"CVE-2026-20205","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-04-15T17:39:19.517Z"}}]}}}