{"id":"CVE-2026-55529","state":"PUBLISHED","title":"PraisonAI: Origin validation bypass in MCP HTTP Stream transport allows browser-mediated unauthenticated tool execution on local MCP server","description":"PraisonAI is a multi-agent teams system. Prior to praisonai 4.6.58, the MCP HTTP Stream _validate_origin method accepts request_origin.startswith(allowed), so the attacker-controlled localhost.evil.example HTTP origin matches the localhost allowlist. Without an API key, a malicious webpage can submit tools/call requests to the local MCP server and execute exposed tools. This issue is fixed in version 4.6.58.","publishedAt":"2026-08-25T14:26:30.692Z","updatedAt":"2026-08-27T15:15:14.217Z","severity":{"score":6.9,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:L/A:N","source":"GitHub_M"},"assigner":"GitHub_M","products":["MervinPraison PraisonAI"],"affected":[{"vendor":"MervinPraison","product":"PraisonAI","versions":[{"version":"< 4.6.58","status":"affected"}]}],"references":["https://github.com/MervinPraison/PraisonAI/security/advisories/GHSA-wj6g-v78p-6fx3","https://github.com/MervinPraison/PraisonAI/commit/2f9677abb2ea68eab864ee8b6a828fd0141612e1","https://github.com/MervinPraison/PraisonAI/releases/tag/v4.6.58"],"weaknesses":["CWE-306","CWE-346"],"ingestedAt":"2026-10-29T20:12:24.861Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/55xxx/CVE-2026-55529.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-55529","state":"PUBLISHED","datePublished":"2026-08-25T14:26:30.692Z","dateUpdated":"2026-08-27T15:15:14.217Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-06-16T23:01:04.073Z"},"containers":{"cna":{"title":"PraisonAI: Origin validation bypass in MCP HTTP Stream transport allows browser-mediated unauthenticated tool execution on local MCP server","descriptions":[{"lang":"en","value":"PraisonAI is a multi-agent teams system. Prior to praisonai 4.6.58, the MCP HTTP Stream _validate_origin method accepts request_origin.startswith(allowed), so the attacker-controlled localhost.evil.example HTTP origin matches the localhost allowlist. Without an API key, a malicious webpage can submit tools/call requests to the local MCP server and execute exposed tools. This issue is fixed in version 4.6.58."}],"affected":[{"vendor":"MervinPraison","product":"PraisonAI","versions":[{"version":"< 4.6.58","status":"affected"}]}],"references":[{"url":"https://github.com/MervinPraison/PraisonAI/security/advisories/GHSA-wj6g-v78p-6fx3","name":"https://github.com/MervinPraison/PraisonAI/security/advisories/GHSA-wj6g-v78p-6fx3","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/MervinPraison/PraisonAI/commit/2f9677abb2ea68eab864ee8b6a828fd0141612e1","name":"https://github.com/MervinPraison/PraisonAI/commit/2f9677abb2ea68eab864ee8b6a828fd0141612e1","tags":["x_refsource_MISC"]},{"url":"https://github.com/MervinPraison/PraisonAI/releases/tag/v4.6.58","name":"https://github.com/MervinPraison/PraisonAI/releases/tag/v4.6.58","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":6.9,"baseSeverity":"MEDIUM","confidentialityImpact":"HIGH","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"CHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:L/A:N","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-306","lang":"en","description":"CWE-306: Missing Authentication for Critical Function","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-346","lang":"en","description":"CWE-346: Origin Validation Error","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-08-25T14:26:30.692Z"},"source":{"advisory":"GHSA-wj6g-v78p-6fx3","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","references":[{"url":"https://github.com/MervinPraison/PraisonAI/security/advisories/GHSA-wj6g-v78p-6fx3","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-08-27T15:14:43.673364Z","id":"CVE-2026-55529","options":[{"Exploitation":"poc"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-08-27T15:15:14.217Z"}}]}}}