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WordPress plugin

Popup, Optin Form & Email Newsletters for Mailchimp, HubSpot, AWeber – MailOptin <= 1.2.35.1 — Authorization Bypass

9bb9bab2-4f47-41ed-b42e-5272981927a8Published · Updated

Action summary

Affected: ≤1.2.35.1Update to 1.2.35.2 or newer

All remediation steps
Watch plugin
Severity
High7.3
CVSS
7.3
CVSS 3.1 · CNA (Wordfence)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
What does this vector mean?
AV:N Attack vector
Network
AC:L Attack complexity
Low
PR:N Privileges required
None
UI:N User interaction
None
S:U Scope
Unchanged
C:L Confidentiality
Low
I:L Integrity
Low
A:L Availability
Low
Weakness
CWE-862 Missing Authorization
Required access
No account needed
Exploit prediction (EPSS)
No score
CISA KEV
Not listed
On this page8

Am I affected?

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

  1. Affected≤ 1.2.35.1
  2. Patched in1.2.35.2

Update to 1.2.35.2 or newer.

You are affected if you run ≤ 1.2.35.1. Version 1.2.35.2 and later are not affected by this issue.

  • Check your version: in wp-admin go to Plugins → Installed Plugins and read the version under MailOptin – Popup, Optin Forms & Email Newsletters for Mailchimp, HubSpot, AWeber Etc..
  • No admin access? Run a passive check of your site. It reads public files only.
  • No account is needed to exploit this. Treat any exposed site on an affected version as at risk.

What to do

  1. Update to version 1.2.35.2, or a newer patched version
  2. Rotate administrator passwords and application secrets if the site ran a vulnerable version while publicly reachable.
  3. Watch MailOptin – Popup, Optin Forms & Email Newsletters for Mailchimp, HubSpot, AWeber Etc. to get an email when the next vulnerability is published.

Advisory

Source description from Wordfence Intelligence, credited to WPScanTeam.

The Popup, Optin Form & Email Newsletters for Mailchimp, HubSpot, AWeber – MailOptin plugin for WordPress is vulnerable to authorization bypass due to a missing capability check on the fetch_custom_fields and fetch_tags functions in versions up to, and including, 1.2.35.1. This makes it possible for unauthenticated attackers to read and edit Elementor custom fields and tags.

Exploits & references

Proof-of-concept & detection

No public proof-of-concept or detection template is known for this vulnerability.

Advisories & patches

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

All 8
More vulnerabilities in MailOptin – Popup, Optin Forms & Email Newsletters for Mailchimp, HubSpot, AWeber Etc.
SeverityVulnerabilityCVEPublished
Critical9.8Unauthenticated Privilege Escalation to 'form_custom_field_mappings' Parameter
≤1.2.78.6Update to 1.2.78.7
CVE-2026-109515
Medium6.4Authenticated (Contributor+) Stored Cross-Site Scripting
≤1.2.78.0Update to 1.2.78.1
CVE-2026-66703
Critical9.8Unauthenticated Privilege Escalation
≤1.2.77.3Update to 1.2.78.0
CVE-2026-57813
Medium4.4Authenticated (Administrator+) Stored Cross-Site Scripting
≤1.2.75.0Update to 1.2.75.1
CVE-2025-58596
Medium5.4Authenticated (Contributor+) Stored Cross-Site Scripting
≤1.2.70.3Update to 1.2.70.4
CVE-2024-8628

Same weakness (Missing Authorization)

All Missing Authorization
Other Missing Authorization vulnerabilities
SeverityVulnerabilityCVEPublished
High7.2Unauthenticated Stored Cross-Site Scripting via Comment User-Agent Header
EZ SQL Reports Shortcode Widget and DB Backup≤5.25.25Update to 5.26.45
CVE-2026-120688
Critical9.8Unauthenticated Arbitrary File Upload via File Upload via Public Form Submission
Chatterbug Forms – Fast, Flexible WordPress Form Builder≤1.0.2Update to 1.1
CVE-2026-125055
Critical9.8Unauthenticated PHP Object Injection to Remote Code Execution via 'form' Parameter
ELEX WordPress HelpDesk & Customer Ticketing System≤3.3.9Update to 3.4.0
CVE-2026-119077
Medium5.3Unauthenticated Sensitive Information Exposure in 'search' Parameter
Customer Reviews for WooCommerce≤5.127.0Update to 5.128.0
CVE-2026-121518

Timeline

  1. CVE published

    Severity high, CVSS 7.3

  2. Record last updated

Sources & licenses

Vulnerability data
Wordfence Intelligence. Copyright 2012-2026 Defiant Inc. Licensed under the CC BY-SA 4.0.
CVSS / CWE
National Vulnerability Database (NVD), shown unmodified. This product uses the NVD API but is not endorsed or certified by the NVD.
VulnCrest content
Summary, remediation guidance and page layout © VulnCrest. Not sourced from NVD.

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