CVE-2026-14262
HighCVSS 8.8Exploitation Probability (EPSS)
Low risk31th percentile - higher than 31% of all known CVEs
Summary
The Simple JWT Login plugin for WordPress up to version 3.6.6 contains an authentication bypass and privilege escalation vulnerability. An authenticated attacker with subscriber-level access can inject an administrator's email into the `payload` parameter, resulting in a JWT with admin identity and gaining a fully authenticated admin session.
Risk Assessment
The organization is at risk of an authenticated low-privilege attacker taking over an administrator account, leading to full WordPress site compromise, including data theft and malware installation.
Recommendation
Immediately update the Simple JWT Login plugin to the latest available version that fixes this vulnerability. Until the update is applied, temporarily disable the plugin or restrict access to REST endpoints using a Web Application Firewall (WAF).
Other vulnerabilities in Simple JWT Login
Original NVD description (English source)
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.