What’s Vulnerable › Vulnerabilities

CVE-2024-8628: Popup, Optin Form & Email Newsletters for Mailchimp, HubSpot, AWeber – MailOptin <= 1.2.70.3 - Authenticated (Contributor+) Stored Cross-Site Scripting

• Severity: medium (CVSS 5.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-09-24 · updated 2026-06-17
• Weakness: CWE-79

Description

The Popup, Optin Form & Email Newsletters for Mailchimp, HubSpot, AWeber – MailOptin plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the plugin's 'post-meta' shortcode in all versions up to, and including, 1.2.70.3 due to insufficient input sanitization and output escaping on user supplied attributes. This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

Affected products

• properfraction MailOptin – Popup, Optin Forms & Email Newsletters for Mailchimp, HubSpot, AWeber Etc.: before 1.2.70.4 — fixed in 1.2.70.4

How to fix

Upgrade to a fixed version: properfraction MailOptin – Popup, Optin Forms & Email Newsletters for Mailchimp, HubSpot, AWeber Etc. 1.2.70.4. Check the vendor advisory for mitigations.

References

• https://plugins.trac.wordpress.org/changeset/3152552/mailoptin/trunk/src/core/src/EmailCampaigns/Shortcodes.php
• https://www.wordfence.com/threat-intel/vulnerabilities/id/4d64253b-5803-470d-81ba-d5629406b019?source=cve

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