CVE-2026-66703
Received Received - Intake

Cross Site Scripting (XSS) in MailOptin Plugin

Publication date: 2026-08-06

Last updated on: 2026-08-06

Assigner: Patchstack

Description
Contributor Cross Site Scripting (XSS) in MailOptin <= 1.2.78.0 versions.

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Meta Information

Published
2026-08-06
Last Modified
2026-08-06
Generated
2026-08-06
AI Q&A
2026-08-06
EPSS Evaluated
N/A
NVD
CVE-2026-66703
EUVD
EUVD-2026-53907

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
mailoptin mailoptin to 1.2.78.0 (inc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-79 The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

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Executive Summary

This is a Contributor Cross Site Scripting (XSS) vulnerability found in MailOptin versions 1.2.78.0 and earlier. XSS allows attackers to inject malicious scripts into web pages viewed by other users.

Detection Guidance

To detect this XSS vulnerability in MailOptin <= 1.2.78.0, check the installed plugin version via WordPress admin panel or database. If version is 1.2.78.0 or lower, the system is vulnerable. No specific commands are provided in the resources, but manual inspection of plugin files for malicious scripts or reviewing user input handling in forms is recommended.

Impact Analysis

An attacker could exploit this to steal user sessions, redirect users to malicious sites, or deface web pages. Users with contributor roles may be able to escalate privileges or perform actions on behalf of other users.

Compliance Impact

This vulnerability could lead to unauthorized data access or modification, violating GDPR (data protection) and HIPAA (health data privacy) requirements. Organizations may face fines or legal consequences if exploited.

Mitigation Strategies

Update MailOptin to the latest version (1.2.78.1 or higher) to patch the XSS vulnerability. If immediate update is not possible, disable the plugin temporarily until patched.

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