CVE-2026-5229

CRITICAL

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

Title source: cna
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for CVE-2026-5229. PoCs published by xxconi.

AI-analyzed exploit summary This repository contains a functional Python exploit for CVE-2026-5229, targeting the Form Notify WordPress plugin's LINE OAuth authentication bypass vulnerability. The exploit demonstrates two attack paths: cookie injection (Path A) and email matching (Path B), both leading to account takeover.

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.

Exploits (1)

github WORKING POC
by xxconi · poc
https://github.com/xxconi/CVE-2026-5229

This repository contains a functional Python exploit for CVE-2026-5229, targeting the Form Notify WordPress plugin's LINE OAuth authentication bypass vulnerability. The exploit demonstrates two attack paths: cookie injection (Path A) and email matching (Path B), both leading to account takeover.

Classification
Working Poc 95%
Attack Type
Auth Bypass
Complexity
Moderate
Reliability
Reliable
Target: Form Notify WordPress Plugin <= 1.1.10
No auth needed
Prerequisites: WordPress site with Form Notify plugin installed · LINE OAuth enabled · Target user email address
devstral-2 · analyzed May 26, 2026 Full analysis →

Scores

CVSS v3 9.8
EPSS 0.0018
EPSS Percentile 40.2%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CISA SSVC

Vulnrichment
Exploitation none
Automatable yes
Technical Impact total

Details

CWE
CWE-287
Status published
Products (1)
m615926/Receive Notifications After Form Submitting – Form Notify for Any Forms < 1.1.10
Published May 15, 2026
Tracked Since May 15, 2026