Receive Notifications After Form Submitting – Form Notify for Any Forms <= 1.1.10 - Unauthenticated Authentication Bypass via LINE OAuth Callback

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9.8
Improper Authentication
CVE CVE-2026-5229
CVSS 9.8 (Critical)
Publicly Published May 14, 2026
Last Updated May 15, 2026
Researcher Nabil Irawan - Heroes Cyber Security

Description

The Form Notify plugin for WordPress is vulnerable to Authentication Bypass in versions up to and including 1.1.10. This is due to the plugin trusting user-controlled cookie data to determine which WordPress account to authenticate after a LINE OAuth login. When LINE doesn't provide an email address (which is common), the plugin falls back to reading the 'form_notify_line_email' cookie value without verifying that the LINE account is associated with that email address. This makes it possible for unauthenticated attackers to gain access to any user account on the site, including administrator accounts, by completing a LINE OAuth flow with their own LINE account while injecting a malicious cookie containing the target victim's email address.

Learn more about Authentication Bypass vulnerabilities and how to prevent them.

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Vulnerability Details for Receive Notifications After Form Submitting – Form Notify for Any Forms

Receive Notifications After Form Submitting – Form Notify for Any Forms

Software Type Plugin
Software Slug form-notify (view on wordpress.org)
Patched? Yes
Remediation Update to version 1.1.11, or a newer patched version
Affected Version
  • <= 1.1.10
Patched Version
  • 1.1.11

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