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CVE-2026-12949— Wishlist Member X <= 3.34.1 - Unauthenticated Account Takeover via 'mergewith' Parameter

Quick assessment

Affected
Wishlist Member Wishlist Member
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

WishList Member是WishList Member公司的一款为网站提供会员管理功能的CMS插件。 WishList Member 3.34.1及之前版本存在授权问题漏洞，该漏洞源于wpm_register()函数对数据真实性验证不足，仅将注册cookie与GET reg参数进行验证，同时接受POST mergewith和POST wpm_id参数且未验证mergewith用户ID是否引用绑定当前注册事务的临时或非完整注册者，导致未经身份验证的攻击者可通过提供任意用户数字ID作为mergewit

CVSS 9.8 · Critical EPSS 0.53% · P44

Affected Version Matrix 1

VendorProduct Version RangeStatus
Wishlist Member Wishlist Member ≤ 3.34.1 affected
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I. Basic Information for CVE-2026-12949

Vulnerability Information
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Vulnerability Title
Wishlist Member X <= 3.34.1 - Unauthenticated Account Takeover via 'mergewith' Parameter
Source: CVE Program / CVE List V5
Vulnerability Description
The Wishlist Member plugin for WordPress is vulnerable to Account Takeover via Insufficient Verification of Data Authenticity in versions up to and including 3.34.1. This is due to the wpm_register() function validating the registration cookie only against the GET reg parameter while accepting the POST mergewith and POST wpm_id parameters without verifying that the mergewith user ID references a temporary or incomplete registrant that is bound to the current registration transaction. This makes it possible for unauthenticated attackers to take over any existing WordPress account — including administrator accounts — by supplying an arbitrary user's numeric ID as the mergewith value, which causes wp_update_user() to overwrite the target account's username (additionally written via a direct $wpdb UPDATE), password, email address, first name, and last name with attacker-controlled values, while WordPress password and email change notification emails are explicitly suppressed. When wpm_id references a non-existent membership level, no role key is added to the update payload, causing wp_update_user() to preserve the target user's existing role — including administrator — making full privilege escalation a direct consequence of the takeover.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
忘记口令恢复机制弱
Source: CVE Program / CVE List V5
Vulnerability Title
WishList Member 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
WishList Member是WishList Member公司的一款为网站提供会员管理功能的CMS插件。 WishList Member 3.34.1及之前版本存在授权问题漏洞，该漏洞源于wpm_register()函数对数据真实性验证不足，仅将注册cookie与GET reg参数进行验证，同时接受POST mergewith和POST wpm_id参数且未验证mergewith用户ID是否引用绑定当前注册事务的临时或非完整注册者，导致未经身份验证的攻击者可通过提供任意用户数字ID作为mergewit
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Wishlist Member Wishlist Member 0 ~ 3.34.1 -

II. Public POCs for CVE-2026-12949

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III. Intelligence Information for CVE-2026-12949

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Security Blog Posts for CVE-2026-12949 (1)

Vendor Pages for CVE-2026-12949 (1)

IV. Related Vulnerabilities

Same product: Wishlist Member
Same vendor: Wishlist Member
Same weakness: CWE-640

V. Comments for CVE-2026-12949

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