Vulnerability · CVE-2025-3605
Authorization Bypass Through User-Controlled Key
Published May 9, 2025 · corrected/updated Apr 8, 2026 · arkenon Login, Registration and Lost Password Blocks · evidence confidence very high
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. Initial-access exploit intelligence.
Grounded briefings
Catalog interpretations for three audiences. Each brief cites ingested metadata and the original advisories below. They are not independent research and they do not invent exploit steps.
Executive
CVE-2025-3605 is a critical public vulnerability record for arkenon Login, Registration and Lost Password Blocks. CISA lists it as known exploited. Published remediation guidance: Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable. This summary is a catalog interpretation of the ingested metadata and cites the original advisories below.
System administrator
Identify whether arkenon Login, Registration and Lost Password Blocks is in your estate, then compare installed versions with the affected ranges. Affected packages or ranges on record: Kadim Gültekin Frontend Login and Registration Blocks plugin for WordPress; arkenon Login, Registration and Lost Password Blocks 0 ≤1.1.1 (0 ≤1.1.1). Published remediation guidance: Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable. Prefer the vendor or distribution advisory linked in Sources before changing production systems. This is a catalog interpretation, not a runbook.
Security analyst
Signals on file: CVSS 9.8, EPSS 744.0%. CISA lists it as known exploited. Sources contributing to this record: cve_org, euvd, vulncheck_kev. Public exploit references, when present, are outbound links only and are not proof of active exploitation. This is a catalog interpretation of stored metadata.
Exploitation and remediation
Exploitation evidence
Confirmed in CISA KEV since Oct 3, 2025. Listed in CISA KEV and VulnCheck KEV.
Patch and remediation
Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.
Safe detection guidance
Compare installed versions with the affected ranges below and verify the advisory from the original publisher. This site stores metadata and outbound links only; it does not ship exploit code or proof-of-concept payloads.
Technology hubs
Code
The project this record applies to. Exploit listings stay in References.
Timeline
Detection, updates, and resolution for this record.
Oct 3, 2025 · VulnCheck KEV
Detected
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
Oct 3, 2025 · CISA KEV
Known exploited
Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.
Apr 8, 2026 · EUVD
Updated
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
Affected
- vendor Kadim Gültekin Frontend Login and Registration Blocks plugin for WordPressversion unspecified
- vendor arkenon Login, Registration and Lost Password Blocks 0 ≤1.1.10 ≤1.1.1
Sources
- CVE.orgVulnerability recordCVE-2025-3605
Official CVE identifier
cve.org - EUVDVulnerability recordEUVD-2025-14130
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 v
euvd.enisa.europa.eu - VulnCheck KEVConfirmed exploitationCVE-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 v
vulncheck.com