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Vulnerabilities

Vulnerability · CVE-2025-3605

Authorization Bypass Through User-Controlled Key

Published May 9, 2025 · catalog updated Apr 8, 2026 · Login, Registration and Lost Password Blocks

Patch now

CVE-2025-3605 is in the CISA known-exploited catalog. Confirm Login, Registration and Lost Password Blocks against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Severity
Critical9.8
Known exploitation
CISA KEV and VulnCheck KEV
EPSS
7.44%
Remediation
Remediation guidance
Affected products
vendor Kadim Gültekin Frontend Login and Registration Blocks plugin for WordPress · vendor arkenon Login, Registration and Lost Password Blocks 0 ≤1.1.1

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • 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

How to fix CVE-2025-3605

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

CVE-2025-3605 is in the CISA known-exploited catalog. Confirm Login, Registration and Lost Password Blocks against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Which versions are affected?

Compare what you have installed with arkenon Login, Registration and Lost Password Blocks 0 ≤1.1.1 0 ≤1.1.1. Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.

What should an analyst verify?

No weakness class is stored. EPSS 7.44%. The CISA KEV listing is the exploitation evidence. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

WordPress security

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. 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

  2. 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.

  3. 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

Sources

  • CVE.orgVulnerability recordCVE-2025-3605

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2025-3605

    30-day exploitation probability 7.4%

    first.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

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.