# CVE-2023-3407: Subscribe2 <= 10.40 - Cross-Site Request Forgery

> Unauthenticated attackers can trick administrators into sending test emails with custom content via CSRF in the Subscribe2 WordPress plugin.

- **Severity:** Medium 4.3 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 28 Jun 2023
- **Updated:** 8 Apr 2026
- **Also known as:** GHSA-hqh4-g6jw-rw6c

## What is CVE-2023-3407?

CVE-2023-3407 is a medium-severity vulnerability in wedevs Subscribe2 – Form, Email Subscribers & Newsletters, published on 28 Jun 2023. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

The Subscribe2 plugin for WordPress is vulnerable to Cross-Site Request Forgery in versions up to, and including, 10.40. This is due to missing or incorrect nonce validation when sending test emails. This makes it possible for unauthenticated attackers to send test emails with custom content to users on sites running a vulnerable version of this plugin via a forged request granted they can trick a site administrator into performing an action such as clicking on a link.

Weakness: CWE-352 (Cross-Site Request Forgery)

## Which versions are affected by CVE-2023-3407?

It affects 1 product.


Products: Subscribe2 Project Subscribe2.

## How do I fix CVE-2023-3407?

No fix has been published for CVE-2023-3407 yet. Limit exposure of the affected software until one is available.

## Is CVE-2023-3407 being exploited?

There is no known exploitation of CVE-2023-3407 in the wild and no public exploit code.

## Other vulnerabilities in wedevs Subscribe2 – Form, Email Subscribers & Newsletters

- [CVE-2014-6604](https://insights.sbomify.com/CVE-2014-6604/): Cross-site scripting in n/a (medium 6.1)
- [CVE-2023-1844](https://insights.sbomify.com/CVE-2023-1844/): Subscribe2 <= 10.40 - Missing Authorization (medium 4.3)
- [CVE-2022-4309](https://insights.sbomify.com/CVE-2022-4309/): Subscribe2 < 10.38 - User Deletion via CSRF (low 3.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-3407 and fix it if it is affected.

What it is: CVE-2023-3407 is a medium-severity vulnerability in wedevs Subscribe2 – Form, Email Subscribers & Newsletters, published on 28 Jun 2023. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2023-3407 in the wild and no public exploit code.

Affected product: wedevs Subscribe2 – Form, Email Subscribers & Newsletters. 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-2023-3407/ (Markdown: https://insights.sbomify.com/CVE-2023-3407/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-3407
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-3407
- OSV: https://osv.dev/vulnerability/CVE-2023-3407

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From sbomify Insights: https://insights.sbomify.com/CVE-2023-3407/
Summaries are generated and may contain mistakes; the official description above is the record.