Cross Site Scripting Vulnerability in MailOptin by WordPress
CVE-2026-66703

6.5MEDIUM

Key Information:

Vendor

WordPress
Status
Mailoptin
Vendor
CVE Published:
6 August 2026

What is CVE-2026-66703?

MailOptin versions up to 1.2.78.0 are susceptible to a Cross Site Scripting (XSS) vulnerability, which could allow attackers to inject malicious scripts into webpages viewed by users. Successful exploitation may enable unauthorized actions or data theft, compromising the integrity and confidentiality of user information. Users of affected versions are urged to implement immediate security measures or updates to mitigate this risk.

Affected Version(s)

MailOptin <= 1.2.78.0

References

https://patchstack.com/database/wordpress/plugin/mailopti...
vdb-entry

CVSS V3.1

Score:
6.5
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
Required
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Ananda Dhakal (Patchstack) | Patchstack Bug Bounty Program
.