---
id: CVE-2026-14262
title: The Simple JWT Login – Allows you to use JWT on REST endpoints
summary: >-
  The Simple JWT Login – Allows you to use JWT on REST endpoints. plugin for
  WordPress is vulnerable to Authentication Bypass to Privilege Escalation in
  all versions up to, and including, 3.6.6 via the `payload` parameter. The
  vulnerabilit…
severity: high
cvss: 8.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-269
published: '2026-07-11'
updated: '2026-07-11'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-14262'
references:
  - url: >-
      https://plugins.trac.wordpress.org/browser/simple-jwt-login/tags/3.6.6/src/Services/AuthenticateService.php#L163
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/browser/simple-jwt-login/tags/3.6.6/src/Services/AuthenticateService.php#L34
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/browser/simple-jwt-login/tags/3.6.6/src/Services/BaseService.php#L269
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/browser/simple-jwt-login/tags/3.6.6/src/Services/LoginService.php#L62
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/changeset?reponame=&old=3597277%40simple-jwt-login&new=3597277%40simple-jwt-login
    label: security@wordfence.com
  - url: >-
      https://www.wordfence.com/threat-intel/vulnerabilities/id/cd97a7a4-9f57-4882-9e3e-0e9853416af9?source=cve
    label: security@wordfence.com
tags:
  - nvd
epss: 0.00744
epssPercentile: 0.52722
ingestedAt: '2026-07-11T23:16:20.375Z'
---

## Overview

The Simple JWT Login – Allows you to use JWT on REST endpoints. plugin for WordPress is vulnerable to Authentication Bypass to Privilege Escalation in all versions up to, and including, 3.6.6 via the `payload` parameter. The vulnerability exists because `AuthenticateService::generatePayload()` only overwrites JWT payload keys whose names appear in the admin-configured `jwt_payload` list — leaving any attacker-supplied identity claims such as `email`, `id`, or `username` intact and signed into the JWT with the site's HS256 secret. This makes it possible for authenticated attackers, with subscriber-level access and above, to escalate their privileges to that of an Administrator by injecting a target administrator's email address into the `payload` parameter at the `/wp-json/simple-jwt-login/v1/auth` endpoint, then redeeming the resulting JWT at the `/autologin` endpoint to obtain a fully authenticated session as that administrator.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.