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

> Unauthenticated attackers can change arbitrary user emails to reset passwords and take over accounts, including administrators, due to missing identity validation.

- **Severity:** Critical 9.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 9 May 2025
- **Updated:** 8 Apr 2026
- **Also known as:** GHSA-q43x-gh6j-72hr

## What is CVE-2025-3605?

CVE-2025-3605 is a critical authentication bypass vulnerability in arkenon Login, Registration and Lost Password Blocks, published on 9 May 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official 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.

Weakness: CWE-639 (Authorization Bypass Through User-Controlled Key)

## Which versions are affected by CVE-2025-3605?


## How do I fix CVE-2025-3605?

No fix has been published for CVE-2025-3605 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-3605 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-3605 exists.

Public exploit code:

-  WordPress Frontend Login and Registration Blocks Plugin <= 1.0.7 is vulnerable to Privilege Escalation  (github_poc): https://github.com/Nxploited/CVE-2025-3605
- WordPress Frontend Login and Registration Blocks Plugin 1.0.7 - Privilege Escalation (exploitdb)
- WordPress Frontend Login and Registration Blocks Plugin 1.0.7 - Privilege Escalation (nuclei): http/cves/2025/CVE-2025-3605.yaml

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-3605 and fix it if it is affected.

What it is: CVE-2025-3605 is a critical authentication bypass vulnerability in arkenon Login, Registration and Lost Password Blocks, published on 9 May 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-3605 exists.

Affected product: arkenon Login, Registration and Lost Password Blocks. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2025-3605/ (Markdown: https://insights.sbomify.com/CVE-2025-3605/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-3605
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-3605
- OSV: https://osv.dev/vulnerability/CVE-2025-3605

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-3605/
Summaries are generated and may contain mistakes; the official description above is the record.