MailOptin – Popup, Optin Forms & Email Newsletters for Mailchimp, HubSpot, AWeber Etc. <= 1.2.77.3 - Unauthenticated Privilege Escalation

9.8
Incorrect Privilege Assignment
CVE CVE-2026-57813
CVSS 9.8 (Critical)
Publicly Published July 9, 2026
Last Updated July 16, 2026
Researcher qdtad

Description

The MailOptin – Popup, Optin Forms & Email Newsletters for Mailchimp, HubSpot, AWeber Etc. plugin for WordPress is vulnerable to Privilege Escalation in all versions up to, and including, 1.2.77.3. This makes it possible for unauthenticated attackers to elevate their privileges.

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Vulnerability Details for MailOptin – Popup, Optin Forms & Email Newsletters for Mailchimp, HubSpot, AWeber Etc.

Software Type Plugin
Software Slug mailoptin (view on wordpress.org)
Patched? Yes
Remediation Update to version 1.2.78.0, or a newer patched version
Affected Version
  • <= 1.2.77.3
Patched Version
  • 1.2.78.0

Recent vulnerabilities in MailOptin – Popup, Optin Forms & Email Newsletters for Mailchimp, HubSpot, AWeber Etc.

# Title CVE ID CVSS Researchers Date
1 MailOptin – Popup, Optin Forms & Email Newsletters for Mailchimp, HubSpot, AWeber Etc. <= 1.2.78.0 - Authenticated (Contributor+) Stored Cross-Site Scripting CVE-2026-66703 6.4 Ananda Dhakal July 29, 2026
2 MailOptin <= 1.2.75.0 - Authenticated (Administrator+) Stored Cross-Site Scripting CVE-2025-58596 4.4 Fiqro Najiah (EscapesCode) September 3, 2025
3 Popup, Optin Form & Email Newsletters for Mailchimp, HubSpot, AWeber – MailOptin <= 1.2.70.3 - Authenticated (Contributor+) Stored Cross-Site Scripting CVE-2024-8628 5.4 Francesco Carlucci September 23, 2024
4 MailOptin <= 1.2.54.0 - Authenticated (Admin+) Cross Site Scripting CVE-2023-23980 5.5 yuyudhn January 20, 2023
5 MailOptin <= 1.2.49.0 - Missing Authorization to Cache Deletion CVE-2022-36340 5.3 Muhammad Daffa September 23, 2022
6 Popup, Optin Form & Email Newsletters for Mailchimp, HubSpot, AWeber – MailOptin <= 1.2.35.1 - Authorization Bypass 7.3 WPScanTeam June 30, 2021

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