CVE-2026-86596 (GCVE-0-2026-86596)
Vulnerability from cvelistv5 – Published: 2026-11-02 21:30 – Updated: 2026-11-02 21:30
VLAI
EPSS
VEX
Title
s2Member <= 260927 - Unauthenticated Remote Code Execution via 'item_name' IPN Parameter
Summary
The s2Member plugin for WordPress is vulnerable to Remote Code Execution in all versions up to, and including, <= 260927 via the 'item_name' parameter parameter. This is due to insufficient sanitization in strip_php_tags_deep(), which only strips literal '<?' sequences, combined with a post-interpolation placeholder cleanup that reassembles a valid '<?php' opener after the attacker-controlled value has already been embedded in the email template. This makes it possible for authenticated attackers, with custom-level access and above, to execute code on the server.
Severity
9.8 (Critical)
CWE
- CWE-94 - Improper Control of Generation of Code
Assigner
References
9 references
Impacted products
1 product
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| clavaque | s2Member – Excellent for All Kinds of Memberships, Content Restriction Paywalls & Member Access Subscriptions |
Affected:
0 , ≤ 260927
(semver)
|
guessed |
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "s2Member \u2013 Excellent for All Kinds of Memberships, Content Restriction Paywalls \u0026 Member Access Subscriptions",
"vendor": "clavaque",
"versions": [
{
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"status": "affected",
"version": "0",
"versionType": "semver"
}
]
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"credits": [
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"type": "finder",
"value": "khanhnv"
}
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{
"lang": "en",
"value": "The s2Member plugin for WordPress is vulnerable to Remote Code Execution in all versions up to, and including, \u003c= 260927 via the \u0027item_name\u0027 parameter parameter. This is due to insufficient sanitization in strip_php_tags_deep(), which only strips literal \u0027\u003c?\u0027 sequences, combined with a post-interpolation placeholder cleanup that reassembles a valid \u0027\u003c?php\u0027 opener after the attacker-controlled value has already been embedded in the email template. This makes it possible for authenticated attackers, with custom-level access and above, to execute code on the server."
}
],
"metrics": [
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"baseSeverity": "CRITICAL",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
}
}
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"problemTypes": [
{
"descriptions": [
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"cweId": "CWE-94",
"description": "CWE-94 Improper Control of Generation of Code",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-11-02T21:30:23.199Z",
"orgId": "b15e7b5b-3da4-40ae-a43c-f7aa60e62599",
"shortName": "Wordfence"
},
"references": [
{
"url": "https://www.wordfence.com/threat-intel/vulnerabilities/id/bbe64cd3-c5ca-4867-90de-4784510a1126?source=cve"
},
{
"url": "https://plugins.trac.wordpress.org/browser/s2member/tags/260829/src/includes/classes/utilities.inc.php#L49"
},
{
"url": "https://plugins.trac.wordpress.org/browser/s2member/tags/260829/src/includes/classes/paypal-notify-in-web-accept-sp.inc.php#L138"
},
{
"url": "https://plugins.trac.wordpress.org/browser/s2member/tags/260829/src/includes/classes/paypal-notify-in-web-accept-sp.inc.php#L131"
},
{
"url": "https://plugins.trac.wordpress.org/browser/s2member/tags/260829/src/includes/classes/paypal-notify-in-web-accept-sp.inc.php#L104"
},
{
"url": "https://plugins.trac.wordpress.org/browser/s2member/tags/260829/src/includes/classes/utils-strings.inc.php#L201"
},
{
"url": "https://plugins.trac.wordpress.org/browser/s2member/tags/260829/src/includes/classes/paypal-notify-in.inc.php#L49"
},
{
"url": "https://plugins.trac.wordpress.org/browser/s2member/tags/260829/src/includes/classes/paypal-notify-in-subscr-or-wa-w-level.inc.php#L514"
},
{
"url": "https://plugins.trac.wordpress.org/changeset/3722434/s2member"
}
],
"timeline": [
{
"lang": "en",
"time": "2026-10-14T04:20:37.000Z",
"value": "Vendor Notified"
},
{
"lang": "en",
"time": "2026-11-02T08:59:41.000Z",
"value": "Disclosed"
}
],
"title": "s2Member \u003c= 260927 - Unauthenticated Remote Code Execution via \u0027item_name\u0027 IPN Parameter"
}
},
"cveMetadata": {
"assignerOrgId": "b15e7b5b-3da4-40ae-a43c-f7aa60e62599",
"assignerShortName": "Wordfence",
"cveId": "CVE-2026-86596",
"datePublished": "2026-11-02T21:30:23.199Z",
"dateReserved": "2026-09-08T08:18:31.098Z",
"dateUpdated": "2026-11-02T21:30:23.199Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2026-86596",
"date": "2026-11-04",
"epss": "0.01487",
"percentile": "0.74119"
},
"nvd": {
"cve": {
"affected": [
{
"affectedData": [
{
"defaultStatus": "unaffected",
"product": "s2Member \u2013 Excellent for All Kinds of Memberships, Content Restriction Paywalls \u0026 Member Access Subscriptions",
"vendor": "clavaque",
"versions": [
{
"lessThanOrEqual": "260927",
"status": "affected",
"version": "0",
"versionType": "semver"
}
]
}
],
"source": "security@wordfence.com"
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "The s2Member plugin for WordPress is vulnerable to Remote Code Execution in all versions up to, and including, \u003c= 260927 via the \u0027item_name\u0027 parameter parameter. This is due to insufficient sanitization in strip_php_tags_deep(), which only strips literal \u0027\u003c?\u0027 sequences, combined with a post-interpolation placeholder cleanup that reassembles a valid \u0027\u003c?php\u0027 opener after the attacker-controlled value has already been embedded in the email template. This makes it possible for authenticated attackers, with custom-level access and above, to execute code on the server."
}
],
"id": "CVE-2026-86596",
"lastModified": "2026-11-02T22:17:23.633",
"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": "2026-11-02T22:17:23.490",
"references": [
{
"source": "security@wordfence.com",
"url": "https://plugins.trac.wordpress.org/browser/s2member/tags/260829/src/includes/classes/paypal-notify-in-subscr-or-wa-w-level.inc.php#L514"
},
{
"source": "security@wordfence.com",
"url": "https://plugins.trac.wordpress.org/browser/s2member/tags/260829/src/includes/classes/paypal-notify-in-web-accept-sp.inc.php#L104"
},
{
"source": "security@wordfence.com",
"url": "https://plugins.trac.wordpress.org/browser/s2member/tags/260829/src/includes/classes/paypal-notify-in-web-accept-sp.inc.php#L131"
},
{
"source": "security@wordfence.com",
"url": "https://plugins.trac.wordpress.org/browser/s2member/tags/260829/src/includes/classes/paypal-notify-in-web-accept-sp.inc.php#L138"
},
{
"source": "security@wordfence.com",
"url": "https://plugins.trac.wordpress.org/browser/s2member/tags/260829/src/includes/classes/paypal-notify-in.inc.php#L49"
},
{
"source": "security@wordfence.com",
"url": "https://plugins.trac.wordpress.org/browser/s2member/tags/260829/src/includes/classes/utilities.inc.php#L49"
},
{
"source": "security@wordfence.com",
"url": "https://plugins.trac.wordpress.org/browser/s2member/tags/260829/src/includes/classes/utils-strings.inc.php#L201"
},
{
"source": "security@wordfence.com",
"url": "https://plugins.trac.wordpress.org/changeset/3722434/s2member"
},
{
"source": "security@wordfence.com",
"url": "https://www.wordfence.com/threat-intel/vulnerabilities/id/bbe64cd3-c5ca-4867-90de-4784510a1126?source=cve"
}
],
"sourceIdentifier": "security@wordfence.com",
"vulnStatus": "Deferred",
"weaknesses": [
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"value": "CWE-94"
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],
"source": "security@wordfence.com",
"type": "Primary"
}
]
}
}
}
}
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Nomenclature
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Browse all ATT&CK techniques and the vulnerabilities related to each.
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