Mailonix – Email Template Customizer for WooCommerce <= 1.3.4 — Unauthenticated Arbitrary Shortcode Injection
CVE-2026-103358Published · Updated Action summary
Affected: ≤1.3.4Update to 1.3.5 or newer
All remediation steps- Severity
- Medium6.5
- CVSS
- 6.5CVSS 3.1 · CNA (Wordfence)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:NWhat does this vector mean?
AV:NAttack vector- Network
AC:LAttack complexity- Low
PR:NPrivileges required- None
UI:NUser interaction- None
S:UScope- Unchanged
C:LConfidentiality- Low
I:LIntegrity- Low
A:NAvailability- None
- Required access
- No account needed
- Exploit prediction (EPSS)
- 0.3% chance in 30 days25th percentile
- CISA KEV
- Not listed
On this page8
Am I affected?
Mailonix – Email Template Customizer for WooCommerce email-template-customizer-for-woo
- Affected≤ 1.3.4
- Patched in1.3.5
Update to 1.3.5 or newer.
You are affected if you run ≤ 1.3.4. Version 1.3.5 and later are not affected by this issue.
- Check your version: in wp-admin go to Plugins → Installed Plugins and read the version under Mailonix – Email Template Customizer for WooCommerce.
- No admin access? Run a passive check of your site. It reads public files only.
- No account is needed to exploit this. Treat any exposed site on an affected version as at risk.
What to do
- Update to version 1.3.5, or a newer patched version
- Rotate administrator passwords and application secrets if the site ran a vulnerable version while publicly reachable.
- Watch Mailonix – Email Template Customizer for WooCommerce to get an email when the next vulnerability is published.
Advisory
Source description from Wordfence Intelligence, credited to cazy.
The The Mailonix – Email Template Customizer for WooCommerce plugin for WordPress is vulnerable to arbitrary shortcode execution in all versions up to, and including, 1.3.4. This is due to the software allowing users to execute an action that does not properly validate a value before running do_shortcode. This makes it possible for unauthenticated attackers to execute arbitrary shortcodes.
Exploits & references
Proof-of-concept & detection
No public proof-of-concept or detection template is known for this vulnerability.
Advisories & patches
- Advisorywordfence.com
Related CVEs
More in Mailonix – Email Template Customizer for WooCommerce
All 3| Severity | Vulnerability | CVE | Published |
|---|---|---|---|
| Medium4.4 | Authenticated (Shop manager+) Stored Cross-Site Scripting ≤1.2.17Update to 1.2.18 | CVE-2025-64200 | |
| Medium4.4 | Authenticated (Shop manager+) Stored Cross-Site Scripting ≤1.2.9.1Update to 1.2.9.2 | CVE-2024-49288 |
- Medium4.4Authenticated (Shop manager+) Stored Cross-Site Scripting
≤1.2.17Update to 1.2.18
- Medium4.4Authenticated (Shop manager+) Stored Cross-Site Scripting
≤1.2.9.1Update to 1.2.9.2
Timeline
CVE published
Severity medium, CVSS 6.5
Record last updated
Sources & licenses
Wordfence record- Vulnerability data
- Wordfence Intelligence. Copyright 2012-2026 Defiant Inc. Licensed under the CC BY-SA 4.0.
- CVE® identifiers
- Copyright 1999-2026 The MITRE Corporation. Used under the CVE Program. CVE® is a registered trademark of The MITRE Corporation.
- CVSS / CWE
- National Vulnerability Database (NVD), shown unmodified. This product uses the NVD API but is not endorsed or certified by the NVD.
- EPSS
- Exploit Prediction Scoring System by FIRST.org.
- VulnCrest content
- Summary, remediation guidance and page layout © VulnCrest. Not sourced from NVD.