WPCOM Member <= 1.7.16 - Authentication Bypass via Weak OTP
21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 8.1epss 0.5%
exploitation probability
0.5%top 58% of all CVEs
observed exploitation
nono source reports it
The WPCOM Member plugin for WordPress is vulnerable to authentication bypass via brute force in all versions up to, and including, 1.7.16. This is due to weak OTP (One-Time Password) generation using only 6 numeric digits combined with a 10-minute validity window and no rate limiting on verification attempts. This makes it possible for unauthenticated attackers to brute-force the verification code and authenticate as any user, including administrators, if they know the target's phone number, and the target does not notice or ignores the SMS notification with the OTP.
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Affected products
whyun · WPCOM MemberReferences
https://plugins.trac.wordpress.org/browser/wpcom-member/tags/1.7.16/includes/class-sesstion.php#L29https://plugins.trac.wordpress.org/browser/wpcom-member/tags/1.7.16/includes/member-functions.php#L833https://plugins.trac.wordpress.org/changeset/3411048/wpcom-memberhttps://www.wordfence.com/threat-intel/vulnerabilities/id/4f02ee56-40bd-4132-92e1-e2897ff2a4c4?source=cve