FKIE_CVE-2026-104745
Vulnerability from fkie_nvd - Published: 2026-10-16 04:18 - Updated: 2026-10-16 15:17
Severity
Summary
The Customer Email Verification for WooCommerce plugin for WordPress is vulnerable to Privilege Escalation via the `alg_wc_ev_verify_email` parameter in versions up to, and including, 3.3.0. The vulnerability exists because `alg_wc_ev_generate_user_code()` generates the per-user activation secret using `wp_rand(100)` when the plugin's 'Encoding method' is set to 'hashids', producing only ~101 possible values (~7 bits of entropy); the resulting token is a reversible Hashids encoding with no cryptographic MAC, and the unauthenticated `verify()` handler — hooked to `init` at `PHP_INT_MAX` with no nonce check and no rate limiting — accepts and acts on the attacker-controlled `?alg_wc_ev_verify_email=` GET parameter directly. This makes it possible for unauthenticated attackers to gain authentication as any unverified WordPress account, including administrator-level accounts, by brute-forcing the trivially small activation code space via a forged verification URL. Exploitation requires that the 'Encoding method' setting be changed to 'hashids' (non-default), that the attacker recover or brute-force the Hashids salt (which defaults to an `md5(time())` value set at first initialization), and that the target account's email address remain unverified.
References
Impacted products
| Vendor | Product | Version |
|---|
{
"affected": [
{
"affectedData": [
{
"defaultStatus": "unaffected",
"product": "Customer Email Verification for WooCommerce",
"vendor": "wpcodefactory",
"versions": [
{
"lessThanOrEqual": "3.3.0",
"status": "affected",
"version": "0",
"versionType": "semver"
}
]
}
],
"source": "security@wordfence.com"
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "The Customer Email Verification for WooCommerce plugin for WordPress is vulnerable to Privilege Escalation via the `alg_wc_ev_verify_email` parameter in versions up to, and including, 3.3.0. The vulnerability exists because `alg_wc_ev_generate_user_code()` generates the per-user activation secret using `wp_rand(100)` when the plugin\u0027s \u0027Encoding method\u0027 is set to \u0027hashids\u0027, producing only ~101 possible values (~7 bits of entropy); the resulting token is a reversible Hashids encoding with no cryptographic MAC, and the unauthenticated `verify()` handler \u2014 hooked to `init` at `PHP_INT_MAX` with no nonce check and no rate limiting \u2014 accepts and acts on the attacker-controlled `?alg_wc_ev_verify_email=` GET parameter directly. This makes it possible for unauthenticated attackers to gain authentication as any unverified WordPress account, including administrator-level accounts, by brute-forcing the trivially small activation code space via a forged verification URL. Exploitation requires that the \u0027Encoding method\u0027 setting be changed to \u0027hashids\u0027 (non-default), that the attacker recover or brute-force the Hashids salt (which defaults to an `md5(time())` value set at first initialization), and that the target account\u0027s email address remain unverified."
}
],
"id": "CVE-2026-104745",
"lastModified": "2026-10-16T15:17:03.563",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 8.1,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"exploitabilityScore": 2.2,
"impactScore": 5.9,
"source": "security@wordfence.com",
"type": "Secondary"
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"id": "CVE-2026-104745",
"options": [
{
"exploitation": "none"
},
{
"automatable": "no"
},
{
"technicalImpact": "total"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-10-16T14:50:43.348176Z",
"version": "2.0.3"
}
}
]
},
"published": "2026-10-16T04:18:21.607",
"references": [
{
"source": "security@wordfence.com",
"url": "https://plugins.trac.wordpress.org/browser/emails-verification-for-woocommerce/tags/3.3.0/includes/alg-wc-ev-functions.php#L331"
},
{
"source": "security@wordfence.com",
"url": "https://plugins.trac.wordpress.org/browser/emails-verification-for-woocommerce/tags/3.3.0/includes/class-alg-wc-ev-core.php#L1258"
},
{
"source": "security@wordfence.com",
"url": "https://plugins.trac.wordpress.org/browser/emails-verification-for-woocommerce/tags/3.3.0/includes/class-alg-wc-ev-core.php#L498"
},
{
"source": "security@wordfence.com",
"url": "https://plugins.trac.wordpress.org/browser/emails-verification-for-woocommerce/tags/3.3.0/includes/class-alg-wc-ev-core.php#L784"
},
{
"source": "security@wordfence.com",
"url": "https://plugins.trac.wordpress.org/changeset?reponame=\u0026old=3744623%40emails-verification-for-woocommerce\u0026new=3744623%40emails-verification-for-woocommerce"
},
{
"source": "security@wordfence.com",
"url": "https://www.wordfence.com/threat-intel/vulnerabilities/id/6df7b3ed-a1e3-4df9-828e-95530661e27a?source=cve"
}
],
"sourceIdentifier": "security@wordfence.com",
"vulnStatus": "Deferred",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-269"
}
],
"source": "security@wordfence.com",
"type": "Secondary"
}
]
}
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Browse all ATT&CK techniques and the vulnerabilities related to each.
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