Auth bypass in Arkenon Login, Registration And Lost Password Blocks

CVE-2025-3605

The Frontend Login and Registration Blocks plugin for WordPress is vulnerable to privilege escalation via account takeover in all versions up to, and including, 1.1.1. This is due to the plugin not properly validating a user's identity prior to updating their details like email via the flr_blocks_user_settings_handle_ajax_callback() function. This makes it possible for unauthenticated attackers to change arbitrary user's email addresses, including administrators, and leverage that to reset the user's password and gain access to their account.

Vulnerability class: IDOR (Insecure Direct Object Reference)

Published · last modified .

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.069 (93.9th percentile), scored .

Low probability of exploitation in the next 30 days, but still tracked. 94th percentile — 93.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2025-3605: held from 0.069 to 0.069.

EPSS over last 30 days · oldest: 0.069 · newest: 0.069 · change: 0.000

Affected products

Weakness classification (CWE)

Public proof-of-concept exploits

References

Frequently asked questions

What is CVE-2025-3605?
CVE-2025-3605 is a critical-severity vulnerability in Arkenon Login, Registration And Lost Password Blocks, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 9.8/10. Published 2025-05-09.
How severe is CVE-2025-3605?
Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2025-3605 known to be exploited?
7 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.