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CVE-2026-86833— MetForm < 4.3.1 - Unauthenticated HTML Injection in Notification Emails via Field Shortcodes

Quick assessment

Affected
Unknown MetForm
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

MetForm WordPress 插件在 4.3.1 版本之前，在将用户提交的表单字段值插入电子邮件通知的 HTML 正文之前，未对其进行净化或转义处理，从而导致未认证的攻击者能够向站点发送给管理员和提交者的通知电子邮件中注入任意标记。

CVSS 5.4 · Medium EPSS 0.16% · P5

Possible ATT&CK Techniques 1 AI

T1133 · External Remote Services

Affected Version Matrix 1

VendorProduct Version RangeStatus
Unknown MetForm < 4.3.1 affected
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I. Basic Information for CVE-2026-86833

Vulnerability Information
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Vulnerability Title
MetForm < 4.3.1 - Unauthenticated HTML Injection in Notification Emails via Field Shortcodes
Source: CVE Program / CVE List V5
Vulnerability Description
The MetForm WordPress plugin before 4.3.1 does not sanitize or escape submitted form-field values before inserting them into the HTML body of its email notifications, allowing unauthenticated attackers to inject arbitrary markup into the administrator and submitter notification emails the site sends.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Unknown MetForm 0 ~ 4.3.1 -

II. Public POCs for CVE-2026-86833

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III. Intelligence Information for CVE-2026-86833

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Other References for CVE-2026-86833 (1)

Same Patch Batch · Unknown · 2026-10-07 · 24 CVEs total

CVE-2026-82211 8.2 HIGH Nexi XPay Build <= 7.6.2 - Unauthenticated Payment Completion and Order Key Disclosure
CVE-2026-82212 7.5 HIGH Nexi XPay Build <= 7.6.2 - Unauthenticated Payment Bypass via NPG Notification Handler
CVE-2026-105322 5.3 MEDIUM Magee Shortcodes <= 2.1.1 - Unauthenticated Mail Relay via Contact Form
CVE-2026-103323 Integration for Epos Now and WooCommerce 4.6.0 - 4.11.1 - Unauthenticated Action Scheduler
CVE-2026-104049 Academy LMS < 4.0.0 - Subscriber+ Arbitrary Lesson Content Disclosure via Topic REST Endpo
CVE-2026-104651 Yaad Sarig Payment Gateway For WC < 2.2.13 - Subscriber+ Arbitrary Order Payment Manipulat
CVE-2026-104652 Envira Gallery < 1.16.1 - Author+ Stored XSS via Gallery Image ID
CVE-2026-104050 Academy LMS < 4.0.0 - Subscriber+ Cross-Course Quiz Answer Disclosure via render_quiz_answ
CVE-2026-103681 Frontend Dashboard < 3.0.0 - Subscriber+ Profile and Post Field Deletion via fed_user_prof
CVE-2026-103378 Geliver Akıllı Kargo Pazaryeri 3.0.0 - 3.1.0 - Unauthenticated API Key Disclosure via Publ
CVE-2026-104653 Envira Gallery < 1.16.1 - Author+ Stored XSS via Gallery Crop Dimensions
CVE-2026-104953 MPG < 4.2.3 - Editor+ SQLi via Project Import
CVE-2026-104677 WP Coder 4.0 - 4.5.1 - Editor+ RCE via Global PHP
CVE-2026-104667 Animated Number Counters < 3.1 - Editor+ Second-Order SQLi via Counter Order
CVE-2026-104678 CP Media Player < 1.3.4 - Contributor+ Media Player Settings Update
CVE-2026-105316 Magee Shortcodes <= 2.1.1 - Reflected XSS via live_preview and magee_create_shortcode Acti
CVE-2026-86816 WPCafe < 3.0.21 - Unauthenticated Product Data Disclosure via REST API
CVE-2026-87971 If-So Dynamic Content 1.4.4 - 1.10.1 - Reflected XSS via 'message' Parameter
CVE-2026-87782 Koinonia Link 1.1.2 - 1.1.4 - Subscriber+ Privilege Escalation to Administrator
CVE-2026-97188 String Locator < 2.6.8 - Unauthenticated PHP Object Injection via Database Editor

Showing top 20 of 24 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: MetForm
Same vendor: Unknown

V. Comments for CVE-2026-86833

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