YayMail <= 4.3.2 - Missing Authorization to Authenticated (Shop Manager+) Plugin Installation and Activation
Key facts
- Attack vector
- Network
- Privileges required
- High
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- None · Low · None
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-862.
Summary
The YayMail - WooCommerce Email Customizer plugin for WordPress is vulnerable to unauthorized plugin installation and activation due to missing capability checks on the 'yaymail_install_yaysmtp' AJAX action and `/yaymail/v1/addons/activate` REST endpoint in all versions up to, and including, 4.3.2. This makes it possible for authenticated attackers, with Shop Manager-level access and above, to install and activate the YaySMTP plugin.
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 |
|---|---|---|---|---|---|
| YayCommerce | YayMail – WooCommerce Email Customizer | up to 4.3.2 | — | No fix listed | CNA |
- YayMail – WooCommerce Email Customizer VendorYayCommerce Affected up to 4.3.2 Fixed in — No fix listed CNA
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2026-1831
- 2026-10-03 Alias added: GHSA-gxvp-w433-832f
References
Other 5
- https://www.wordfence.com/threat-intel/vulnerabilities/id/a568162a-5a2d-47ab-9dfe-2f2f5f324f0d?source=cve
- https://plugins.trac.wordpress.org/browser/yaymail/tags/4.3.2/src/Ajax.php#L183
- https://plugins.trac.wordpress.org/browser/yaymail/trunk/src/Ajax.php#L183
- https://plugins.trac.wordpress.org/browser/yaymail/tags/4.3.2/src/Controllers/AddonController.php#L76
- https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&old=3460087%40yaymail&new=3460087%40yaymail&sfp_email=&sfph_mail=#file11
More YayCommerce vulnerabilities
- TI-2024-06722 Unrestricted file upload in YayCommerce YayExtra – WooCommerce Extra Product Options CVSS 3.1CRITICAL 9.8
- TI-2026-75234 Arbitrary file upload in YaySMTP WordPress plugin enables code execution CVSS 3.1HIGH 8.8
- TI-2025-41603 WordPress YayCurrency plugin <= 3.3 - Arbitrary Content Deletion vulnerability CVSS 3.1HIGH 7.5
- TI-2025-37443 WordPress YayPricing plugin <= 3.5.3 - Broken Access Control vulnerability CVSS 3.1HIGH 7.5
- TI-2025-03017 SMTP for Amazon SES – YaySMTP <= 1.8 - Unauthenticated Stored Cross-Site Scripting via Email Logs CVSS 3.1HIGH 7.2
- TI-2025-00812 Vulnerability: SMTP for Amazon SES <= 1.8 - Unauthenticated Stored Cross-Site Scripting via Email Logs CVSS 3.1HIGH 7.2
Sources
- CVE-2026-1831 · CVE Program
- CVE-2026-1831 · NVD
- FIRST EPSS
- GHSA-gxvp-w433-832f · 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