# CVE-2023-32517: WordPress MailChimp Subscribe Forms Plugin <= 4.0.9.3 is vulnerable to Open Redirection

> Attackers can redirect users to malicious sites via the MailChimp Subscribe Forms plugin, potentially facilitating phishing attacks.

- **Severity:** Medium 4.7 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:N/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:** 29 Dec 2023
- **Updated:** 28 Apr 2026
- **Also known as:** GHSA-q34j-6xqh-3786

## What is CVE-2023-32517?

CVE-2023-32517 is a medium-severity vulnerability in PluginOps MailChimp Subscribe Form, Optin Builder, PopUp Builder, Form Builder, published on 29 Dec 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

URL Redirection to Untrusted Site ('Open Redirect') vulnerability in PluginOps MailChimp Subscribe Form, Optin Builder, PopUp Builder, Form Builder.This issue affects MailChimp Subscribe Form, Optin Builder, PopUp Builder, Form Builder: from n/a through 4.0.9.3.

Weakness: CWE-601 (URL Redirection to Untrusted Site)

## Which versions are affected by CVE-2023-32517?

It affects 1 product.


Products: Ibericode Mailchimp.

## How do I fix CVE-2023-32517?

No fix has been published for CVE-2023-32517 yet. Limit exposure of the affected software until one is available.

## Is CVE-2023-32517 being exploited?

There is no known exploitation of CVE-2023-32517 in the wild and no public exploit code.

## Other vulnerabilities in PluginOps MailChimp Subscribe Form, Optin Builder, PopUp Builder, Form Builder

- [CVE-2024-8850](https://insights.sbomify.com/CVE-2024-8850/): MC4WP: Mailchimp for WordPress 4.9.9 - 4.9.16 - Reflected Cross-Site Scripting (medium 6.1)
- [CVE-2023-51682](https://insights.sbomify.com/CVE-2023-51682/): WordPress MC4WP plugin <= 4.9.9 - Broken Access Control vulnerability (medium 5.3)
- [CVE-2024-8680](https://insights.sbomify.com/CVE-2024-8680/): MailChimp for Wordpress <= 4.9.16 - Authenticated (Administrator+) Stored Cross-Site Scripting (medium 4.4)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-32517 and fix it if it is affected.

What it is: CVE-2023-32517 is a medium-severity vulnerability in PluginOps MailChimp Subscribe Form, Optin Builder, PopUp Builder, Form Builder, published on 29 Dec 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-2023-32517 in the wild and no public exploit code.

Affected product: PluginOps MailChimp Subscribe Form, Optin Builder, PopUp Builder, Form Builder. 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-2023-32517/ (Markdown: https://insights.sbomify.com/CVE-2023-32517/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-32517
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-32517
- OSV: https://osv.dev/vulnerability/CVE-2023-32517

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From sbomify Insights: https://insights.sbomify.com/CVE-2023-32517/
Summaries are generated and may contain mistakes; the official description above is the record.