Wishlist Member X <= 3.34.1 - Unauthenticated Account Takeover via 'mergewith' Parameter
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.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| WordPress plugin | Wishlist Member | <= 3.34.1 | 3.34.2 |
References
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H- Weakness (CWE)
CWE-640- Platform
- WordPress
- Package
Wishlist Member- Disclosed
- 13.08.2026
- Updated
- 11.10.2026 10:22
Sources and licenses
Wordfence Intelligence - 84afe5a7-1bf4-4b83-bf77-efbb003a30cd - Wordfence Intelligence
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Copyright 2012-2026 Defiant Inc.
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Vulnerability history: Wishlist Member
All published vulnerabilities of this package (WordPress plugin), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 16
- First → latest
- 06.2024 08.2026
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- Critical 3
- High 9
- Medium 4
Disclosures per year
- 2024: 8
- 2025: 0
- 2026: 8
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Wishlist Member X <= 3.34.1 - Unauthenticated Account Takeover via 'mergewith' Parameter this entry
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