{"id":"CVE-2026-58497","title":"Uni-CLI: Legacy HTTP MCP transport accepted browser-originated localhost requests","summary":"Uni-CLI gives people and agents one command interface for websites, browsers, desktop applications, local tools, and MCP. Prior to version 0.225.2, Uni-CLI exposed the legacy JSON-RPC-over-HTTP MCP transport on loopback without validatin…","severity":"high","cvss":8.6,"cvssVector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N","cvssSource":"cna","cwe":["CWE-346","CWE-352"],"vendor":"olo-dot-io","product":"Uni-CLI","affected":["Uni-CLI < 0.225.2"],"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"total","timestamp":"2026-10-23T20:54:34.404803Z"},"published":"2026-10-23","updated":"2026-10-23","sourceUpdated":"2026-10-23T20:57:14.612Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-58497","references":[{"url":"https://github.com/olo-dot-io/Uni-CLI/security/advisories/GHSA-v3f4-w7r7-v3hm","label":"https://github.com/olo-dot-io/Uni-CLI/security/advisories/GHSA-v3f4-w7r7-v3hm"},{"url":"https://github.com/olo-dot-io/Uni-CLI/releases/tag/v0.225.2","label":"https://github.com/olo-dot-io/Uni-CLI/releases/tag/v0.225.2"}],"tags":["cve.org"],"ingestedAt":"2026-10-23T15:29:36.880Z","slug":"CVE-2026-58497","body":"## Overview\n\nUni-CLI gives people and agents one command interface for websites, browsers, desktop applications, local tools, and MCP. Prior to version 0.225.2, Uni-CLI exposed the legacy JSON-RPC-over-HTTP MCP transport on loopback without validating browser Origin headers before routing requests. A malicious web page could send a CORS simple POST request, such as text/plain, to the local /mcp endpoint and deliver a JSON-RPC body to the dispatcher. If the user had started the local MCP HTTP transport, that page could drive tools/call requests against the user's local Uni-CLI server. The Streamable HTTP transport already enforced this browser-to-localhost boundary. The legacy stateless HTTP path did not, so the two HTTP transports had drifted. This issue is about the browser-to-localhost boundary; it does not change Uni-CLI's local-code-execution trust model. This issue has been patched in version 0.225.2.\n\n## Affected\n\n- `Uni-CLI < 0.225.2`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":47,"depthScoreParts":{"impact":47.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}