CVE-2026-40799 MEDIUM

CVE-2026-40799: WordPress Simple Cloudflare Turnstile plugin <= 1.38.0 - Broken Authentication vulnerability

Vendor Relywp

Product Simple Cloudflare Turnstile

Weakness CWE-288

Published June 15, 2026

Last update June 15, 2026

View on NVD All CVEs

CVSS base score

5.8/10

Attack vector Network

Attack complexity Low

Privileges required None

User interaction None

Confidentiality None

Integrity Low

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

What the vulnerability does

01Description

Unauthenticated Broken Authentication in Simple Cloudflare Turnstile <= 1.38.0 versions.

Explanation of Vulnerability in Simple Terms

02Summary

Simple Cloudflare Turnstile versions up to 1.38.0 contain an authentication bypass vulnerability. An attacker can manipulate requests to bypass the Turnstile CAPTCHA verification without user interaction. This allows automated attacks, spam submissions, or unauthorized actions on sites using this plugin. Update to a version newer than 1.38.0 immediately.

What an attacker can do

03Attacker Capabilities

Bypass Cloudflare Turnstile CAPTCHA verification to submit forms or perform actions without solving the challenge.

Potential impact on your site

04Site Impact

Spam, automated attacks, and unauthorized form submissions bypass your CAPTCHA protection.

Conditions required to exploit

05Prerequisites

Network access to the site; no authentication or user interaction required.

Key dates

06Disclosure timeline

June 15, 2026 CVE published

June 15, 2026 Record updated

External resources

07References

NVD — National Vulnerability Database https://nvd.nist.gov/vuln/detail/CVE-2026-40799 CWE — Common Weakness Enumeration https://cwe.mitre.org/data/definitions/288.html AskarLabs — CWE-288 write-up Authentication Bypass Using an Alternate Path or Channel

Related vulnerabilities

Identifiers

CVE CVE-2026-40799

CWE CWE-288

CVSS 5.8 / MEDIUM

Affected versions