Vulnerabilities / WP Mailster / WPSEC-2026-1272
WP Mailster <= 1.9.1.0 - Unauthenticated Stored Cross-Site Scripting via Email Subject and Body
High 7.2
CWE-79Fixed in 1.9.2.0
- ID
- WPSEC-2026-1272
- Plugin
- WP Mailster (wp-mailster)
- Affected
- all versions before 1.9.2.0
- Remediation
- Update to 1.9.2.0 or later.
- CVSS 3.1
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
- Weakness
- CWE-79
- Usage
- Plugin Low · Affected versions None seen among sites WPSec scans, 2026-10-20
- Attack surface
- WP Mailster on WPSec AttackSurface
- Fix released
- Published
Description
The WP Mailster plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the subject, sender name and HTML body of emails received by a mailing list in all versions up to, and including, 1.9.1.0. This is due to insufficient output escaping on the admin email details and resend screens. This makes it possible for unauthenticated attackers who can send an email to a list's mailbox to inject arbitrary web scripts that will execute whenever an administrator views the email's details or the resend page.
References
- https://wpsec.com/vuln/WPSEC-2026-1272/
- https://plugins.svn.wordpress.org/wp-mailster/tags/1.9.2.0/
- https://wordpress.org/plugins/wp-mailster/
Published by WPSec. Provided as is, without warranty. Corrections: contact us.
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