Is MailerLite safe to use?

Laskyr does not give safety verdicts. No known unpatched vulnerabilities in the latest version (1.7.27). As of 2026-11-04. 7 issues are on record for older versions; version 1.7.22 or newer fixes all of them that state a fix. Keep MailerLite on the latest version (1.7.27) and remove it if you do not use it.

Which versions of MailerLite are vulnerable?

Known issues on record (newest first): Missing authorization check (1.7.21 and older, fixed in 1.7.22); Missing authorization check (1.7.18 and older, fixed in 1.7.19); Stored cross-site scripting (XSS) (1.7.16 and older, fixed in 1.7.17); Missing authorization check (1.7.6 and older, fixed in 1.7.7); Stored cross-site scripting (XSS) (1.5.0 to 1.7.6, fixed in 1.7.7); Cross-site request forgery (CSRF) (1.5.7 and older, fixed in 1.5.8). The full list with sources is on this page.

What is the latest version of MailerLite?

1.7.27, according to wordpress.org (last updated 2026-10-27). It has 100,000+ active installs.

What should I do if my MailerLite is out of date?

Take a backup, then update it from Dashboard > Updates (or run wp plugin update official-mailerlite-sign-up-forms). 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 · official-mailerlite-sign-up-forms · data as of 2026-11-04

Is MailerLite safe? Known vulnerabilities and latest version

Latest version: 1.7.27
Last updated: 2026-10-27
Active installs: 100,000+
Known issues on record: 7
Unpatched in latest: 0
Tested up to WP: 6.8.12 · PHP 7.2.5+

Add newsletter signup forms to your WordPress site. Subscribers will be saved directly to your MailerLite account. Super easy to set up! — by MailerLite

What to do

Update to the latest version (1.7.27). Anything older than 1.7.22 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 official-mailerlite-sign-up-forms --field=version shows what you run; wp plugin update official-mailerlite-sign-up-forms updates it.

Check your version

Known vulnerabilities

7 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.

medium 4.3 CVE-2026-3253 · published 2026-09-24

Missing authorization check in MailerLite (1.7.21 and older)

Affected: 1.7.21 and older
Fixed in: 1.7.22 *
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 MailerLite – Signup forms (official) plugin for WordPress is vulnerable to unauthorized modification of data due to a missing capability check on the forms() method of the AdminController class in all versions up to, and including, 1.7.21. This makes it possible for authenticated attackers, with Contributor-level access and above, to create or delete arbitrary signup forms.

NVD CVE-2026-3253 Wordfence advisory Code change (fix)

medium 4.3 CVE-2026-25420 · published 2026-02-19

Missing authorization check in MailerLite (1.7.18 and older)

Affected: 1.7.18 and older
Fixed in: 1.7.19
Access needed (per CVSS): Needs a low-level account (e.g. subscriber)
Range from: CVE record (the advisory publisher) · score by Patchstack

Details from the advisory

Missing Authorization vulnerability in MailerLite MailerLite official-mailerlite-sign-up-forms allows Exploiting Incorrectly Configured Access Control Security Levels.This issue affects MailerLite: from n/a through <= 1.7.18.

NVD CVE-2026-25420 Patchstack advisory

medium 5.5 CVE-2025-13993 · published 2025-12-12

Stored cross-site scripting (XSS) in MailerLite (1.7.16 and older)

Affected: 1.7.16 and older
Fixed in: 1.7.17 *
Access needed (per CVSS): Needs an admin-level account
Range from: CVE record (the advisory publisher) · score by Wordfence

Details from the advisory

The MailerLite – Signup forms (official) plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'form_description' and 'success_message' parameters in versions up to, and including, 1.7.16 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with administrator access or higher, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

NVD CVE-2025-13993 Wordfence advisory Code change (fix)Plugin source

medium 5.3 CVE-2024-2797 · published 2024-05-02

Missing authorization check in MailerLite (1.7.6 and older)

Affected: 1.7.6 and older
Fixed in: 1.7.7 *
Access needed (per CVSS): No login needed
Range from: CVE record (the advisory publisher) · score by Wordfence

Details from the advisory

The MailerLite – Signup forms (official) plugin for WordPress is vulnerable to unauthorized plugin setting changes due to a missing capability check on the toggleRolesAndPermissions and editAllowedRolesAndPermissions functions in all versions up to, and including, 1.7.6. This makes it possible for unauthenticated attackers to allow lower level users to modify forms.

NVD CVE-2024-2797 Wordfence advisory Code change (fix)Plugin source

medium 6.4 CVE-2024-1386 · published 2024-05-02

Stored cross-site scripting (XSS) in MailerLite (1.5.0 to 1.7.6)

Affected: 1.5.0 to 1.7.6
Fixed in: 1.7.7 *
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 MailerLite – Signup forms (official) plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the plugin's shortcode(s) in versions 1.5.0 to 1.7.6 due to insufficient input sanitization and output escaping on user supplied attributes. This makes it possible for authenticated attackers with contributor-level and above permissions to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

NVD CVE-2024-1386 Wordfence advisory Code change (fix)Plugin source

high 8.8 CVE-2022-33201 · published 2022-08-05

Cross-site request forgery (CSRF) in MailerLite (1.5.7 and older)

Affected: 1.5.7 and older
Fixed in: 1.5.8 *
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 MailerLite – Signup forms (official) plugin <= 1.5.7 at WordPress allows an attacker to change the API key.

NVD CVE-2022-33201 Patchstack advisory wordpress.org

medium 6.1 CVE-2022-1604 · published 2022-06-13

Reflected cross-site scripting (XSS) in MailerLite (older than 1.5.4)

Affected: older than 1.5.4
Fixed in: 1.5.4
Access needed (per CVSS): No login needed; someone on the site has to click a link or open a page
Range from: advisory text · score by NVD

Details from the advisory

The MailerLite WordPress plugin before 1.5.4 does not sanitise and escape a parameter before outputting it back in the page, leading to a Reflected Cross-Site Scripting

NVD CVE-2022-1604 WPScan advisory

Recent activity

2026-10-27 — latest release on wordpress.org (1.7.27).
2026-09-24 — Missing authorization check disclosed (CVE-2026-3253), fixed in 1.7.22.
2026-02-19 — Missing authorization check disclosed (CVE-2026-25420), fixed in 1.7.19.
2025-12-12 — Stored cross-site scripting (XSS) disclosed (CVE-2025-13993), fixed in 1.7.17.

Free. We check the CVE feeds every day and email you only when a new issue for MailerLite (official-mailerlite-sign-up-forms) is published or a fix ships. Unsubscribe in one click.

Browse vulnerabilities

Types found in this plugin: Missing authorization (3) · Cross-site scripting (XSS) (3) · Cross-site request forgery (CSRF) (1)

Where this data comes from

Version, last update, installs: wordpress.org/plugins/official-mailerlite-sign-up-forms (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/official-mailerlite-sign-up-forms"><img src="https://laskyr.com/plugins/official-mailerlite-sign-up-forms/badge.svg" alt="MailerLite vulnerability status"></a>

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Is MailerLite safe? Known vulnerabilities and latest version

No known unpatched vulnerabilities in the latest version (1.7.27)

What to do

Check your version

Known vulnerabilities

Missing authorization check in MailerLite (1.7.21 and older)

Missing authorization check in MailerLite (1.7.18 and older)

Stored cross-site scripting (XSS) in MailerLite (1.7.16 and older)

Missing authorization check in MailerLite (1.7.6 and older)

Stored cross-site scripting (XSS) in MailerLite (1.5.0 to 1.7.6)

Cross-site request forgery (CSRF) in MailerLite (1.5.7 and older)

Reflected cross-site scripting (XSS) in MailerLite (older than 1.5.4)

Recent activity

Get an email when MailerLite has a new vulnerability

Browse vulnerabilities

Where this data comes from