CVE-2026-19804— s2Member <= 260814 PayPal代理返回未认证远程代码执行漏洞
一分钟漏洞结论
影响对象
clavaque s2Member – Excellent for All Kinds of Memberships, Content Restriction Paywalls & Member Access Subscriptions
利用判断
尚无明确在野利用证据，仍需结合暴露面评估
建议动作
优先检查厂商安全公告和参考链接中的修复版本；无法立即升级时，限制受影响服务暴露并加强监测。
WordPress 插件 s2Member – Excellent for All Kinds of Memberships, Content Restriction Paywalls & Member Access Subscriptions 在所有版本直至并包括 260814 版本中，存在通过 参数导致远程代码执行（RCE）的安全漏洞。该漏洞的产生原因是： 参数在通过 函数进行清理时，仅移除了正则表达式中的反向引用（regex backreferences），而未过滤 PHP 标签；随后该参数被代入由 执行的“
影响版本矩阵 1
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| clavaque | s2Member – Excellent for All Kinds of Memberships, Content Restriction Paywalls & Member Access Subscriptions | ≤ 260814 |
affected |
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一、 漏洞 CVE-2026-19804 基础信息
漏洞信息
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Vulnerability Title
s2Member <= 260814 - Unauthenticated Remote Code Execution via 'first_name' Parameter in PayPal Proxy Return
来源: CVE Program / CVE List V5
Vulnerability Description
The s2Member – Excellent for All Kinds of Memberships, Content Restriction Paywalls & Member Access Subscriptions plugin for WordPress is vulnerable to Remote Code Execution in all versions up to, and including, 260814 via the 'first_name' parameter parameter. This is due to insufficient sanitization of the first_name parameter via esc_refs(), which strips only regex backreferences and not PHP tags, before substitution into the eval'd Signup Tracking Codes template, combined with disclosure of the site-global proxy verification key that allows PayPal postback verification to be bypassed. This makes it possible for unauthenticated attackers to execute code on the server. Successful exploitation requires that the site administrator has configured a Signup Tracking Codes template containing the %%first_name%% placeholder (a documented, GUI-supported feature) and that the attacker has obtained the site-global proxy verification key, which is exposed in plaintext in the JSON response of any PayPal Checkout AJAX request on the target site.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
来源: CVE Program / CVE List V5
Vulnerability Type
对生成代码的控制不恰当(代码注入)
来源: CVE Program / CVE List V5
受影响产品
| 厂商 | 产品 | 影响版本 | CPE | 订阅 |
|---|---|---|---|---|
| clavaque | s2Member – Excellent for All Kinds of Memberships, Content Restriction Paywalls & Member Access Subscriptions | 0 ~ 260814 | - |
|
二、漏洞 CVE-2026-19804 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2026-19804 补丁与修复 (5)
CVE-2026-19804 厂商安全公告 (1)
IV. Related Vulnerabilities
V. Comments for CVE-2026-19804
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