Auth bypass in Ultimatemember Ultimate Member – User Profile, Registration, Login, Directory, Content Restriction & Membership Plugin
CVE-2026-4248
The Ultimate Member plugin for WordPress is vulnerable to Sensitive Information Exposure in all versions up to, and including, 2.11.2. This is due to the '{usermeta:password_reset_link}' template tag being processed within post content via the '[um_loggedin]' shortcode, which generates a valid password reset token for the currently logged-in user viewing the page. This makes it possible for authenticated attackers, with Contributor-level access and above, to craft a malicious pending post that, when previewed by an Administrator, generates a password reset token for the Administrator and exfiltrates it to an attacker-controlled server, leading to full account takeover.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.0 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.004 (33.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 34th percentile — 33.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.004 · change: +0.002
Affected products
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2026-4248?
- CVE-2026-4248 is a high-severity vulnerability in Ultimatemember Ultimate Member – User Profile, Registration, Login, Directory, Content Restriction & Membership Plugin, classified under Improper Authorization. CVSS score: 8.0/10. Published 2026-03-27.
- How severe is CVE-2026-4248?
- High severity. CVSS v3 base score is 8.0 out of 10.