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)
EPSS: 0.064 (93.0th percentile) — read the EPSS interpretation.
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.
Affected products
- Arkenon Login, Registration And Lost Password Blocks — versions 0
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.