Plugins · mailoptin · data as of 2026-11-04
Is MailOptin safe? Known vulnerabilities and latest version
- Latest version
- 1.2.78.7
- Last updated
- 2026-10-13
- Active installs
- 10,000+
- Known issues on record
- 7
- Unpatched in latest
- 0
- Tested up to WP
- 7.1.4 · PHP 7.4+
Create popup, optin forms using easy form builder & popup maker. Send automated email to subscribers — Mailchimp, ActiveCampaign, Campaign Monitor etc — by properfraction
What to do
- Update to the latest version (1.2.78.7). Anything older than 1.2.78.7 has at least one known issue listed below. Dashboard → Updates, or Plugins → “update now”.
- If you cannot update right away, deactivate it until you can.
- Turn on auto-updates for it: Plugins → “Enable auto-updates” on its row.
- If you ran a vulnerable version and something looks off (spam pages, strange admins, redirects), run the free scan.
With WP-CLI: wp plugin get mailoptin --field=version shows what you run; wp plugin update mailoptin updates it.
Check your version
Known vulnerabilities
7 on record, newest first. “Affected” is the version range the source gives; “fixed in” is the version the source names, or (marked *) the first wordpress.org release after the last affected version.
critical 9.8 CVE-2026-109515 · published 2026-10-16
Privilege escalation in MailOptin (1.2.78.6 and older)
- Affected
- 1.2.78.6 and older
- Fixed in
- 1.2.78.7 *
- Access needed (per CVSS)
- No login needed
- Range from
- CVE record (the advisory publisher) · score by Wordfence
Details from the advisory
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.
NVD CVE-2026-109515Wordfence advisoryCode change (fix)Plugin source
medium 6.5 CVE-2026-66703 · published 2026-08-06
Cross-site scripting (XSS) in MailOptin (1.2.78.0 and older)
- Affected
- 1.2.78.0 and older
- Fixed in
- 1.2.78.1
- Access needed (per CVSS)
- Needs a low-level account (e.g. subscriber); someone on the site has to click a link or open a page
- Range from
- CVE record (the advisory publisher) · score by Patchstack
Details from the advisory
Contributor Cross Site Scripting (XSS) in MailOptin <= 1.2.78.0 versions.
critical 9.8 CVE-2026-57813 · published 2026-07-13
Privilege escalation in MailOptin (1.2.77.3 and older)
- Affected
- 1.2.77.3 and older
- Fixed in
- 1.2.78.0
- Access needed (per CVSS)
- No login needed
- Range from
- CVE record (the advisory publisher) · score by Patchstack
Details from the advisory
Incorrect Privilege Assignment vulnerability in properfraction MailOptin mailoptin allows Privilege Escalation.This issue affects MailOptin: from n/a through <= 1.2.77.3.
medium 5.9 CVE-2025-58596 · published 2025-09-03
Stored cross-site scripting (XSS) in MailOptin (1.2.75.0 and older)
- Affected
- 1.2.75.0 and older
- Fixed in
- 1.2.75.1
- Access needed (per CVSS)
- Needs an admin-level account; someone on the site has to click a link or open a page
- Range from
- CVE record (the advisory publisher) · score by Patchstack
Details from the advisory
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in properfraction MailOptin mailoptin allows Stored XSS.This issue affects MailOptin: from n/a through <= 1.2.75.0.
medium 5.4 CVE-2024-8628 · published 2024-09-24
Stored cross-site scripting (XSS) in MailOptin (1.2.70.3 and older)
- Affected
- 1.2.70.3 and older
- Fixed in
- 1.2.70.4 *
- Access needed (per CVSS)
- Needs a low-level account (e.g. subscriber); someone on the site has to click a link or open a page
- Range from
- CVE record (the advisory publisher) · score by Wordfence
Details from the advisory
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.
medium 4.8 CVE-2023-23980 · published 2023-04-06
Stored cross-site scripting (XSS) in MailOptin (1.2.54.0 and older)
- Affected
- 1.2.54.0 and older
- Fixed in
- 1.2.54.1
- Access needed (per CVSS)
- Needs an admin-level account; someone on the site has to click a link or open a page
- Range from
- CVE record (the advisory publisher) · score by NVD
Details from the advisory
Auth. (admin+) Stored Cross-Site Scripting (XSS) vulnerability in MailOptin Popup Builder Team MailOptin plugin <= 1.2.54.0 versions.
medium 5.3 CVE-2022-36340 · published 2022-09-23
Missing authorization check in MailOptin (1.2.49.0 and older)
- Affected
- 1.2.49.0 and older
- Fixed in
- 1.2.50.0 *
- Access needed (per CVSS)
- No login needed
- Range from
- CVE record (the advisory publisher) · score by NVD
Details from the advisory
Unauthenticated Optin Campaign Cache Deletion vulnerability in MailOptin plugin <= 1.2.49.0 at WordPress.
NVD CVE-2022-36340Patchstack advisoryplugins.svn.wordpress.org
Recent activity
- 2026-10-13 — latest release on wordpress.org (1.2.78.7).
- 2026-10-16 — Privilege escalation disclosed (CVE-2026-109515), fixed in 1.2.78.7.
- 2026-08-06 — Cross-site scripting (XSS) disclosed (CVE-2026-66703), fixed in 1.2.78.1.
- 2026-07-13 — Privilege escalation disclosed (CVE-2026-57813), fixed in 1.2.78.0.
Get an email when MailOptin has a new vulnerability
Free. We check the CVE feeds every day and email you only when a new issue for MailOptin (mailoptin) is published or a fix ships. Unsubscribe in one click.
Browse vulnerabilities
- Published this week
- Unpatched in the latest version
- By type of vulnerability
- Plugins by properfraction (4 tracked)
Types found in this plugin: Cross-site scripting (XSS) (4) · Privilege escalation (2) · Missing authorization (1)
Where this data comes from
- Version, last update, installs: wordpress.org/plugins/mailoptin (Plugins API), fetched 2026-11-04.
- Vulnerabilities: NIST National Vulnerability Database (NVD), checked 2026-11-04. This product uses data from the NVD API but is not endorsed or certified by the NVD.
- Each record links to its CVE page and to the original advisory (Wordfence, Patchstack or WPScan) where there is one. We only list a CVE here when its references or its advisory name this exact plugin, so a few real issues may be missing; none should be about a different plugin. Spot an error? Email Daniel.
Badge for your site or docs (states facts with a date, not a verdict):
<a href="https://laskyr.com/plugins/mailoptin"><img src="https://laskyr.com/plugins/mailoptin/badge.svg" alt="MailOptin vulnerability status"></a>