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Fri, 16 Oct 2026 15:30:00 +0000
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ssvc
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Fri, 16 Oct 2026 04:45:00 +0000
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| 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, 1.2.78.6 This is due to the `subscribe_to_email_list` endpoint accepting an attacker-supplied `optin_data[form_custom_field_mappings]` parameter without any allow-list validation on destination keys, allowing the attacker-controlled mapping to override the administrator's saved mapping and pass arbitrary `wp_users` column names — including `ID` and `user_pass` — directly into `wp_insert_user()` via the `subscribe()` function. This makes it possible for unauthenticated attackers to force `wp_insert_user()` into UPDATE mode on any existing account by supplying a target user's numeric `ID`, overwrite that account's password with a pre-hashed value of their choosing, and thereby take over any WordPress user account — including administrators — leading to full site compromise. Exploitation requires that a WordPress User Registration opt-in form is published somewhere on the site, though the form's UUID is visible in page source and no authentication, nonce, or capability check is required to reach the vulnerable endpoint. | |
| Title | MailOptin <= 1.2.78.6 - Unauthenticated Privilege Escalation to 'form_custom_field_mappings' Parameter | |
| Weaknesses | CWE-269 | |
| References |
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| Metrics |
cvssV3_1
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Projects
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Status: PUBLISHED
Assigner: Wordfence
Published:
Updated: 2026-10-16T15:09:39.848Z
Reserved: 2026-10-12T18:05:34.654Z
Link: CVE-2026-109515
Updated: 2026-10-16T15:00:19.764Z
Status : Deferred
Published: 2026-10-16T05:17:29.597
Modified: 2026-10-16T15:17:07.900
Link: CVE-2026-109515
No data.
OpenCVE Enrichment
Updated: 2026-10-16T14:30:13Z