Is Mailmunch Forms for Mailchimp safe to use?

Laskyr does not give safety verdicts. No known unpatched vulnerabilities in the latest version (3.3.1). As of 2026-11-04. 6 issues are on record for older versions; version 3.2.8 or newer fixes all of them that state a fix. Keep Mailmunch Forms for Mailchimp on the latest version (3.3.1) and remove it if you do not use it.

Which versions of Mailmunch Forms for Mailchimp are vulnerable?

Known issues on record (newest first): Missing authorization check (3.2.7 and older, fixed in 3.2.8); Missing authorization check (3.1.4 and older, fixed in 3.1.5); Reflected cross-site scripting (XSS) (3.2.3 and older, fixed in 3.2.4); Cross-site request forgery (CSRF) (3.2.1 and older, fixed in 3.2.2); Stored cross-site scripting (XSS) (3.2.2 and older, fixed in 3.2.3); Cross-site request forgery (CSRF) (3.1.4 and older, fixed in 3.1.8). The full list with sources is on this page.

What is the latest version of Mailmunch Forms for Mailchimp?

3.3.1, according to wordpress.org (last updated 2026-10-14). It has 10,000+ active installs.

What should I do if my Mailmunch Forms for Mailchimp is out of date?

Take a backup, then update it from Dashboard > Updates (or run wp plugin update mailchimp-forms-by-mailmunch). If you cannot update right away, deactivate it until you can. If you think the site was already attacked, run a free scan at https://laskyr.com/scan.

Plugins · mailchimp-forms-by-mailmunch · data as of 2026-11-04

Is Mailmunch Forms for Mailchimp safe? Known vulnerabilities and latest version

Latest version: 3.3.1
Last updated: 2026-10-14
Active installs: 10,000+
Known issues on record: 6
Unpatched in latest: 0
Tested up to WP: 7.0.8

The easiest way to convert your site visitors into email subscribers. — by mailmunch

What to do

Update to the latest version (3.3.1). Anything older than 3.2.8 has at least one known issue listed below. Dashboard → Updates, or Plugins → “update now”.
If you cannot update right away, deactivate it until you can.
Turn on auto-updates for it: Plugins → “Enable auto-updates” on its row.
If you ran a vulnerable version and something looks off (spam pages, strange admins, redirects), run the free scan.

With WP-CLI: wp plugin get mailchimp-forms-by-mailmunch --field=version shows what you run; wp plugin update mailchimp-forms-by-mailmunch updates it.

Check your version

Known vulnerabilities

6 on record, newest first. “Affected” is the version range the source gives; “fixed in” is the version the source names, or (marked *) the first wordpress.org release after the last affected version.

high 8.1 CVE-2026-7520 · published 2026-08-05

Missing authorization check in Mailmunch Forms for Mailchimp (3.2.7 and older)

Affected: 3.2.7 and older
Fixed in: 3.2.8 *
Access needed (per CVSS): Needs a low-level account (e.g. subscriber)
Range from: CVE record (the advisory publisher) · score by Wordfence

Details from the advisory

The MailChimp Forms by MailMunch plugin for WordPress is vulnerable to unauthorized modification of data due to a missing capability check on the `sign_in()` and `sign_up()` AJAX handlers in all versions up to, and including, 3.2.7. This makes it possible for authenticated attackers, with Subscriber-level access and above, to relink the site's MailMunch integration to an attacker-controlled MailMunch account by submitting attacker-supplied credentials. Once relinked, all subscriber data captured by the plugin's forms is delivered to the attacker, and the forms/landing pages rendered on the site are pulled from the attacker's MailMunch account.

NVD CVE-2026-7520 Wordfence advisory Code change (fix)Plugin source

high 8.8 CVE-2023-40203 · published 2024-12-13

Missing authorization check in Mailmunch Forms for Mailchimp (3.1.4 and older)

Affected: 3.1.4 and older
Fixed in: 3.1.5
Access needed (per CVSS): No login needed; someone on the site has to click a link or open a page
Range from: CVE record (the advisory publisher) · score by NVD

Details from the advisory

Missing Authorization vulnerability in MailMunch MailChimp Forms by MailMunch allows Exploiting Incorrectly Configured Access Control Security Levels.This issue affects MailChimp Forms by MailMunch: from n/a through 3.1.4.

NVD CVE-2023-40203 Patchstack advisory

medium 6.1 CVE-2024-8726 · published 2024-11-20

Reflected cross-site scripting (XSS) in Mailmunch Forms for Mailchimp (3.2.3 and older)

Affected: 3.2.3 and older
Fixed in: 3.2.4 *
Access needed (per CVSS): No login needed; someone on the site has to click a link or open a page
Range from: CVE record (the advisory publisher) · score by Wordfence

Details from the advisory

The MailChimp Forms by MailMunch plugin for WordPress is vulnerable to Reflected Cross-Site Scripting due to the use of add_query_arg without appropriate escaping on the URL in all versions up to, and including, 3.2.3. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that execute if they can successfully trick a user into performing an action such as clicking on a link.

NVD CVE-2024-8726 Wordfence advisory Code change (fix)

high 8.8 CVE-2024-31378 · published 2024-04-15

Cross-site request forgery (CSRF) in Mailmunch Forms for Mailchimp (3.2.1 and older)

Affected: 3.2.1 and older
Fixed in: 3.2.2
Access needed (per CVSS): No login needed; someone on the site has to click a link or open a page
Range from: CVE record (the advisory publisher) · score by NVD

Details from the advisory

Cross-Site Request Forgery (CSRF) vulnerability in MailMunch MailChimp Forms by MailMunch.This issue affects MailChimp Forms by MailMunch: from n/a through 3.2.1.

NVD CVE-2024-31378 Patchstack advisory

medium 5.4 CVE-2024-29793 · published 2024-03-27

Stored cross-site scripting (XSS) in Mailmunch Forms for Mailchimp (3.2.2 and older)

Affected: 3.2.2 and older
Fixed in: 3.2.3
Access needed (per CVSS): Needs a low-level account (e.g. subscriber); someone on the site has to click a link or open a page
Range from: CVE record (the advisory publisher) · score by NVD

Details from the advisory

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in MailMunch MailChimp Forms by MailMunch allows Stored XSS.This issue affects MailChimp Forms by MailMunch: from n/a through 3.2.2.

NVD CVE-2024-29793 Patchstack advisory

high 8.8 CVE-2023-45748 · published 2023-10-16

Cross-site request forgery (CSRF) in Mailmunch Forms for Mailchimp (3.1.4 and older)

Affected: 3.1.4 and older
Fixed in: 3.1.8 *
Access needed (per CVSS): No login needed; someone on the site has to click a link or open a page
Range from: CVE record (the advisory publisher) · score by NVD

Details from the advisory

Cross-Site Request Forgery (CSRF) vulnerability in MailMunch MailChimp Forms by MailMunch plugin <= 3.1.4 versions.

NVD CVE-2023-45748 Patchstack advisory

Recent activity

2026-10-14 — latest release on wordpress.org (3.3.1).
2026-08-05 — Missing authorization check disclosed (CVE-2026-7520), fixed in 3.2.8.
2024-12-13 — Missing authorization check disclosed (CVE-2023-40203), fixed in 3.1.5.
2024-11-20 — Reflected cross-site scripting (XSS) disclosed (CVE-2024-8726), fixed in 3.2.4.

Free. We check the CVE feeds every day and email you only when a new issue for Mailmunch Forms for Mailchimp (mailchimp-forms-by-mailmunch) is published or a fix ships. Unsubscribe in one click.

Browse vulnerabilities

Types found in this plugin: Missing authorization (2) · Cross-site scripting (XSS) (2) · Cross-site request forgery (CSRF) (2)

Where this data comes from

Version, last update, installs: wordpress.org/plugins/mailchimp-forms-by-mailmunch (Plugins API), fetched 2026-11-04.
Vulnerabilities: NIST National Vulnerability Database (NVD), checked 2026-11-04. This product uses data from the NVD API but is not endorsed or certified by the NVD.
Each record links to its CVE page and to the original advisory (Wordfence, Patchstack or WPScan) where there is one. We only list a CVE here when its references or its advisory name this exact plugin, so a few real issues may be missing; none should be about a different plugin. Spot an error? Email Daniel.

Badge for your site or docs (states facts with a date, not a verdict):

<a href="https://laskyr.com/plugins/mailchimp-forms-by-mailmunch"><img src="https://laskyr.com/plugins/mailchimp-forms-by-mailmunch/badge.svg" alt="Mailmunch Forms for Mailchimp vulnerability status"></a>

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Is Mailmunch Forms for Mailchimp safe? Known vulnerabilities and latest version

No known unpatched vulnerabilities in the latest version (3.3.1)

What to do

Check your version

Known vulnerabilities

Missing authorization check in Mailmunch Forms for Mailchimp (3.2.7 and older)

Missing authorization check in Mailmunch Forms for Mailchimp (3.1.4 and older)

Reflected cross-site scripting (XSS) in Mailmunch Forms for Mailchimp (3.2.3 and older)

Cross-site request forgery (CSRF) in Mailmunch Forms for Mailchimp (3.2.1 and older)

Stored cross-site scripting (XSS) in Mailmunch Forms for Mailchimp (3.2.2 and older)

Cross-site request forgery (CSRF) in Mailmunch Forms for Mailchimp (3.1.4 and older)

Recent activity

Get an email when Mailmunch Forms for Mailchimp has a new vulnerability

Browse vulnerabilities

Where this data comes from