Critical (9.8). EPSS 0.7% chance of exploitation in the next 30 days.
The Ultimate Membership Pro plugin for WordPress is vulnerable to Authentication Bypass in versions between, and including, 7.3 to 8.6. This makes it possible for unauthenticated attackers to login as any user, including the site administrator with a default user ID of 1, via the username or user ID.
Severity
CVSS 3.1
9.8 critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS
0.7% chance of exploitation in the next 30 days; higher than 52% of CVEs (scores of 2026-10-31)