Conditional Fields for Contact Form 7 < 2.7.3 DoS via Uncontrolled Resource Consumption_CVE-2026-25863

{
    "lastseen": "",
    "description": "Conditional Fields for Contact Form 7 WordPress plugin through version 2.6.7 contains an uncontrolled resource consumption vulnerability in the Wpcf7cfMailParser class where the hide_hidden_mail_fields_regex_callback() method reads an iteration count directly from user-supplied POST parameters without validation or upper bound enforcement. Unauthenticated attackers can supply an arbitrarily large integer value through the REST API endpoint to cause unbounded loop execution with multiple preg_replace() operations, exhausting server memory and crashing the PHP process.",
    "published": "2026-05-04T18:29:01.446Z",
    "modified": "2026-05-04T18:29:01.446Z",
    "type": "cve",
    "title": "Conditional Fields for Contact Form 7 < 2.7.3 DoS via Uncontrolled Resource Consumption",
    "source": "VulnCheck",
    "references": "https://wordpress.org/plugins/cf7-conditional-fields/#developers\nhttps://www.vulncheck.com/advisories/conditional-fields-for-contact-form-7-dos-via-uncontrolled-resource-consumption",
    "id": "CVE-2026-25863",
    "bulletinFamily": "",
    "cwe": [
        "CWE-1284"
    ],
    "cvelist": null,
    "sourceData": "Jules Colle Conditional Fields for Contact Form 7 0",
    "sourceHref": "",
    "cvss": {
        "score": 8.7,
        "severity": "HIGH",
        "vector": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
        "version": "4.0"
    },
    "cvss2": [],
    "cvss3": {
        "version": "",
        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
            "baseSeverity": "",
            "attackVector": "",
            "attackComplexity": "",
            "privilegesRequired": "",
            "userInteraction": "",
            "scope": "",
            "confidentialityImpact": "",
            "integrityImpact": "",
            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "Conditional Fields for Contact Form 7",
    "version": "2.6.7",
    "vendor": "Jules Colle",
    "ai_description": "Uncontrolled resource consumption vulnerability in Conditional Fields for Contact Form 7 WordPress plugin",
    "ai_severity": "High",
    "ai_vendor": "Jules Colle",
    "ai_product": "Conditional Fields for Contact Form 7",
    "ai_version": "2.6.7",
    "ai_score": 8.7
}