CVE-2026-109515 MailOptin WordPress Plugin - Privilege Escalation

MailOptin WordPress plugin <= 1.2.78.6 contains a privilege escalation caused by lack of allow-list validation on optin_data[form_custom_field_mappings] in subscribe_to_email_list endpoint, letting unauthenticated attackers overwrite any user password and take over accounts, exploit requires a published WordPress User Registration opt-in form.

CVSS base score 9.8 /10
Critical
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
View the NVD record ↗

Details

Type
Broken Access Control
Impact
Privilege Escalation
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
16 October 2026
Updated
16 October 2026
Weakness
CWE-269

Vendor fix

Update to the latest version beyond 1.2.78.6.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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