CVE-2026-66703

WordPress MailOptin plugin <= 1.2.78.0 - Cross Site Scripting (XSS) vulnerability

Published Aug 6, 2026 CVSS 3.1 · 6.5 Medium EPSS < 1% KEV · Not listed
Description
Contributor Cross Site Scripting (XSS) in MailOptin <= 1.2.78.0 versions.

Remediation

Vendor Solution

Update the WordPress MailOptin Plugin to the latest available version (at least 1.2.78.1).

Tracking

Sign in to view the affected projects.

Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Properfraction
Properfraction mailoptin
Wordpress
Wordpress wordpress
Vendors & Products Properfraction
Properfraction mailoptin
Wordpress
Wordpress wordpress
Type Values Removed Values Added
Description Contributor Cross Site Scripting (XSS) in MailOptin <= 1.2.78.0 versions.
Title WordPress MailOptin plugin <= 1.2.78.0 - Cross Site Scripting (XSS) vulnerability
Weaknesses CWE-79
References
Metrics cvssV3_1

{'score': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
Patchstack
Published
Updated
Aug 6, 2026, 3:35 PM
Reserved
Jul 27, 2026, 2:01 PM
Status
Deferred
Published
Aug 6, 2026, 3:17 PM
Modified
Oct 24, 2026, 4:10 PM