CVE-2026-0903

// CVE-2026-0903 PoC - Dangerous File Type Protection Bypass in Chrome Downloads // This PoC demonstrates the concept of bypassing file type protections // Note: This is for educational and security research purposes only // Simulate a malicious file with deceptive extension const maliciousFileContent = ` #!/bin/bash # This simulates a malicious script disguised as safe content echo 'Malicious payload execution' # In real attack, this would contain actual malicious code `; // Create a file with double extension to bypass protection const deceptiveFilename = 'document.pdf.exe'; // Create a blob with the malicious content const maliciousBlob = new Blob([maliciousFileContent], { type: 'application/octet-stream' }); // Attempt to trigger download through Chrome function triggerDownload() { const downloadLink = document.createElement('a'); downloadLink.href = URL.createObjectURL(maliciousBlob); downloadLink.download = deceptiveFilename; document.body.appendChild(downloadLink); downloadLink.click(); document.body.removeChild(downloadLink); } // The actual PoC would involve specific techniques to bypass Chrome's // dangerous file type protection in the Downloads module console.log('CVE-2026-0903 - File type protection bypass PoC'); console.log('Affected: Chrome < 144.0.7559.59 on Windows'); console.log('This PoC demonstrates the file download bypass concept');

{"cve": {"id": "CVE-2026-0903", "sourceIdentifier": "[email protected]", "published": "2026-01-20T05:16:15.733", "lastModified": "2026-01-29T20:22:01.010", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Inappropriate implementation in Downloads in Google Chrome on Windows prior to 144.0.7559.59 allowed a remote attacker to bypass dangerous file type protections via a malicious file. (Chromium security severity: Medium)"}, {"lang": "es", "value": "Implementación inapropiada en Descargas en Google Chrome en Windows anterior a 144.0.7559.59 permitió a un atacante remoto eludir las protecciones de tipos de archivo peligrosos mediante un archivo malicioso. (Gravedad de seguridad de Chromium: Media)"}], "metrics": {"cvssMetricV31": [{"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": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-20"}]}], "configurations": [{"operator": "AND", "nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:google:chrome:*:*:*:*:*:*:*:*", "versionEndExcluding": "144.0.7559.59", "matchCriteriaId": "7322229C-61DF-4A91-9816-F7796F9AABCD"}]}, {"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": false, "criteria": "cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*", "matchCriteriaId": "703AF700-7A70-47E2-BC3A-7FD03B3CA9C1"}, {"vulnerable": false, "criteria": "cpe:2.3:o:microsoft:windows:-:*:*:*:*:*:*:*", "matchCriteriaId": "A2572D17-1DE6-457B-99CC-64AFD54487EA"}]}]}, {"operator": "AND", "nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:google:chrome:*:*:*:*:*:*:*:*", "versionEndExcluding": "144.0.7559.60", "matchCriteriaId": "258B923C-054B-4411-9E82-36C89A6BE4C4"}]}, {"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": false, "criteria": "cpe:2.3:o:apple:macos:-:*:*:*:*:*:*:*", "matchCriteriaId": "387021A0-AF36-463C-A605-32EA7DAC172E"}]}]}], "references": [{"url": "https://chromereleases.googleblog.com/2026/01/stable-channel-update-for-desktop_13.html", "source": "[email protected]", "tags": ["Release Notes", "Vendor Advisory"]}, {"url": "https://issues.chromium.org/issues/444803530", "source": "[email protected]", "tags": ["Issue Tracking", "Permissions Required"]}]}}