CVE-2026-12949

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.

We have discovered 1,368 live websites that are affected by CVE-2026-12949.

Run a Free Instant Scan

Affected Software

Product	WishList Member
Category	Wordpress Plugins
Vulnerable Domains	1,368 live websites (100% of WishList Member install base)
Vulnerable Versions	from 0 through 3.34.1
Vulnerable Versions Count	123 versions ( 99% of all versions)