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

Create popup, optin forms using easy form builder & popup maker. Send automated email to subscribers — Mailchimp, ActiveCampaign, Campaign Monitor etc

7Reported vulnerabilities

9.8Highest CVSS score

1.2.78.1Latest version

10,000+Active installs

What to do now

Update MailOptin – Popup, Optin Forms & Email Newsletters for Mailchimp, HubSpot, AWeber Etc. to 1.2.78.1 or later. 7 of these have a fixed version available. Updating resolves them.

Plugin last updated: July 28, 2026 / Tested up to WordPress: 7.0.4 / View on wordpress.org

Reported vulnerabilities

Ordered by how urgently they need attention — whether a vulnerability is actually being exploited, and how likely exploitation is, rather than CVSS severity alone.

CVE	Severity	Exploit probability next 30 days	Affected versions	Fixed in	Published
CVE-2026-57813	Critical 9.8	0.5%	1.2.77.3 and earlier	`1.2.78.0`	July 9, 2026
WF-9bb9bab2-4f47-41ed-b42e-5272981927a8	High 7.3	—	1.2.35.1 and earlier	`1.2.35.2`	June 30, 2021
CVE-2026-66703	Medium 6.4	0.1%	1.2.78.0 and earlier	`1.2.78.1`	July 29, 2026
CVE-2024-8628	Medium 5.4	0.3%	Before 1.2.70.4	`1.2.70.4`	September 24, 2024
CVE-2023-23980	Medium 5.5	0.4%	1.2.54.0 to 1.2.54.0 (inclusive)	`1.2.54.1`	January 20, 2023
CVE-2022-36340	Medium 5.3	0.7%	1.2.49.0 and earlier	`1.2.50.0`	September 23, 2022
CVE-2025-58596	Medium 4.4	0.2%	1.2.75.0 and earlier	`1.2.75.1`	September 3, 2025

Sources: vulnerability records from NVD, exploitation from CISA KEV, exploit probability from EPSS. Affected versions come from CPE ranges or from the reporting CNA.