MailerLite – Signup forms (official) vulnerabilities
Plugin slug official-mailerlite-sign-up-forms · 9 known vulnerabilities · latest disclosed 2026-09-23 · WordPress.org page
Every listed vulnerability has a fix. Version 1.7.22 or later is not affected by any of them. If your site runs an older version, update it.
2 of 9 rated high or critical (CVSS 7 or more).
Known vulnerabilities in MailerLite – Signup forms (official)
| Severity | Affected versions | Fixed in | CVE | Published | Details |
|---|---|---|---|---|---|
| Medium 4.3 | <= 1.7.21 | 1.7.22 | CVE-2026-3253 | 2026-09-23 | Advisory |
| Medium 4.3 | <= 1.7.18 | 1.7.19 | CVE-2026-25420 | 2026-01-28 | Advisory |
| Medium 5.5 | <= 1.7.16 | 1.7.17 | CVE-2025-13993 | 2025-12-11 | Advisory |
| Medium 6.4 | 1.5.0 to 1.7.6 | 1.7.7 | CVE-2024-1386 | 2024-04-29 | Advisory |
| Medium 5.3 | <= 1.7.6 | 1.7.7 | CVE-2024-2797 | 2024-04-29 | Advisory |
| High 8.8 | <= 1.5.7 | 1.5.8 | CVE-2022-33201 | 2022-08-01 | Advisory |
| Medium 6.1 | <= 1.5.3 | 1.5.4 | CVE-2022-1604 | 2022-05-18 | Advisory |
| Critical 9.8 | < 1.4.4 | 1.4.4 | none | 2020-05-22 | Advisory |
| Medium 5.4 | < 1.4.5 | 1.4.5 | none | 2020-05-22 | Advisory |
Check if a site is affected
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Questions
Is the MailerLite – Signup forms (official) plugin safe to use?
All 9 known issues are fixed in current versions (1.7.22 or later). Keeping it updated is what matters.
How do I check which version of MailerLite – Signup forms (official) my site runs?
In WordPress go to Plugins > Installed Plugins. From the outside, the free PluginPeek scan below reads the version from the site's public files.
How do I fix a vulnerable plugin?
Make a full backup, then update it from Dashboard > Updates and check the site afterwards. If you would rather not, we can do it for a fixed $99, paid after you have checked the site.