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{"cveTags": [], "descriptions": [{"lang": "en", "value": "The Contact Form by Supsystic plugin for WordPress is vulnerable to Server-Side Template Injection (SSTI) leading to Remote Code Execution (RCE) in all versions up to, and including, 1.7.36. This is due to the plugin using the Twig `Twig_Loader_String` template engine without sandboxing, combined with the `cfsPreFill` prefill functionality that allows unauthenticated users to inject arbitrary Twig expressions into form field values via GET parameters. This makes it possible for unauthenticated attackers to execute arbitrary PHP functions and OS commands on the server by leveraging Twig's `registerUndefinedFilterCallback()` method to register arbitrary PHP callbacks."}], "id": "CVE-2026-4257", "lastModified": "2026-03-30T22:16:20.313", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.8, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 5.9, "source": "security@wordfence.com", "type": "Primary"}]}, "published": "2026-03-30T22:16:20.313", "references": [{"source": "security@wordfence.com", "url": "https://plugins.trac.wordpress.org/browser/contact-form-by-supsystic/tags/1.7.36/modules/forms/views/forms.php#L323"}, {"source": "security@wordfence.com", "url": "https://plugins.trac.wordpress.org/changeset/3491826/contact-form-by-supsystic"}, {"source": "security@wordfence.com", "url": "https://www.wordfence.com/threat-intel/vulnerabilities/id/415c9658-bfb2-453b-a697-c63c08b0ca61?source=cve"}], "sourceIdentifier": "security@wordfence.com", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-94"}], "source": "security@wordfence.com", "type": "Primary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[0,*]"}}], "enrichment": {"confidence": 100.0, "confidence_source": "cna", "scores": [{"score": 100.0, "source": "cna"}]}, "original": {"product": "Contact Form by Supsystic", "source": "cna", "vendor": "supsysticcom"}, "product": "contact_form_by_supsystic", "vendor": "supsysticcom"}, {"configurations": [{"platform": null, "status": "unaffected", "versions": null}], "enrichment": {"confidence": 80.0, "confidence_source": "inferred", "scores": [{"score": 80.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "product": "wordpress", "vendor": "wordpress"}], "analysis": {"en": {"generated_at": "2026-03-31T05:59:50.530933+00:00", "value": {"mitigation_remediation": ["Apply the latest version of the Contact Form by Supsystic plugin that removes the vulnerable prefill functionality.", "If an immediate update is not feasible, disable the prefill capability by removing or restricting the corresponding GET parameters or by adjusting the form configuration to block prefilled values.", "Continuously monitor server logs and web traffic for suspicious activity, and apply general WordPress security best practices such as patching core, themes, and other plugins in a timely manner."], "summary": {"action": "Immediate Patch", "impact": "Remote Code Execution"}, "threat_synthesis": {"affected_systems": "All WordPress installations using the Contact Form by Supsystic plugin version 1.7.36 or earlier are affected; the issue remains within the entire range of supported releases up to and including 1.7.36. The plugin is distributed by supsystic.com and is commonly embedded via their WordPress plugin.", "description_and_impact": "The Contact Form by Supsystic plugin for WordPress contains a Server\u2011Side Template Injection flaw that permits an unauthenticated attacker to inject and execute arbitrary Twig expressions. This vulnerability exposes the server to remote code execution, allowing execution of PHP functions and operating\u2011system commands. The weakness reflects code injection (CWE\u201194).", "risk_and_exploitability": "The CVSS base score is 9.8, indicating critical severity. No EPSS score is published and the vulnerability is not listed in the CISA KEV catalog. Attackers can exploit it over any public site without authentication by supplying crafted GET parameters to the prefill endpoint, triggering the Twig engine to process the injected template and run code. The exploitability is high and exhibits immediate remote code execution potential."}}}}, "created": "2026-03-31T19:57:17.515053+00:00", "updated": "2026-03-31T20:40:01.870970+00:00", "vendors": ["supsysticcom", "supsysticcom$PRODUCT$contact_form_by_supsystic", "wordpress", "wordpress$PRODUCT$wordpress"]}