MailerLite – Signup forms (official) <= 1.7.16 - Authenticated (Administrator+) Stored Cross-Site Scripting
Key facts
- Attack vector
- Network
- Privileges required
- High
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Cross-site scripting
- Confidentiality · integrity · availability
- Low · Low · None
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-79.
Summary
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.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| MailerLite | MailerLite – Signup forms (official) | up to 1.7.16 | — | No fix listed | CNA |
- MailerLite – Signup forms (official) VendorMailerLite Affected up to 1.7.16 Fixed in — No fix listed CNA
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2025-13993
- 2026-10-03 Alias added: GHSA-647v-r7p3-c33c
References
Other 6
- https://www.wordfence.com/threat-intel/vulnerabilities/id/8c37cc28-fde0-45c6-b49c-d6dfb296c4a5?source=cve
- https://plugins.trac.wordpress.org/browser/official-mailerlite-sign-up-forms/tags/1.7.14/src/Controllers/AdminController.php#L179
- https://plugins.trac.wordpress.org/browser/official-mailerlite-sign-up-forms/tags/1.7.14/src/Controllers/AdminController.php#L224
- https://plugins.trac.wordpress.org/browser/official-mailerlite-sign-up-forms/tags/1.7.14/src/Views/CustomForm.php#L38
- https://plugins.trac.wordpress.org/browser/official-mailerlite-sign-up-forms/tags/1.7.14/src/Views/CustomForm.php#L94
- https://plugins.trac.wordpress.org/changeset/3416100/official-mailerlite-sign-up-forms/trunk/src/Controllers/AdminController.php
More MailerLite vulnerabilities
- TI-2025-41554 WordPress MailerLite – WooCommerce integration plugin <= 3.1.2 - SQL Injection vulnerability CVSS 3.1CRITICAL 9.3
- TI-2022-14630 WordPress MailerLite – Signup forms (official) plugin <= 1.5.7 - Cross-Site Request Forgery (CSRF) vulnerability CVSS 3.1HIGH 8.8
- TI-2023-28651 WordPress MailerLite – WooCommerce integration Plugin <= 2.0.8 is vulnerable to Cross Site Request Forgery (CSRF) CVSS 3.1HIGH 8.8
- TI-2024-02608 MailerLite – Signup forms (official) <= 1.7.6 - Missing Authorization CVSS 3.1MEDIUM 5.3
- TI-2026-00754 MailerLite - WooCommerce integration <= 3.1.3 - Missing Authorization to Data Deletion CVSS 3.1MEDIUM 6.5
- TI-2024-01293 The MailerLite – Signup forms (official) plugin for WordPress is vulnerable to Stored… CVSS 3.1MEDIUM 6.4
Sources
- CVE-2025-13993 · CVE Program
- CVE-2025-13993 · NVD
- FIRST EPSS
- GHSA-647v-r7p3-c33c · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences