Simple JWT Login <= 3.6.6 - Authenticated (Subscriber+) Authentication Bypass to Privilege Escalation via 'payload' Parameter
| CVE | CVE-2026-14262 |
|---|---|
| CVSS | 8.8 (High) |
| Publicly Published | July 10, 2026 |
| Last Updated | July 11, 2026 |
| Researcher |
Navapon Premkasem (71C4) (71C4)
|
Description
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.
References
- plugins.trac.wordpress.org
- plugins.trac.wordpress.org
- plugins.trac.wordpress.org
- plugins.trac.wordpress.org
- plugins.trac.wordpress.org
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Vulnerability Details for Simple JWT Login – Allows you to use JWT on REST endpoints.
| Software Type | Plugin |
|---|---|
| Software Slug | simple-jwt-login (view on wordpress.org) |
| Patched? | Yes |
| Remediation | Update to version 3.6.7, or a newer patched version |
| Affected Version |
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| Patched Version |
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Recent vulnerabilities in Simple JWT Login – Allows you to use JWT on REST endpoints.
| # | Title | CVE ID | CVSS | Researchers | Date |
|---|---|---|---|---|---|
| 1 | Simple JWT Login <= 3.6.4 - Authenticated (Contributor+) Stored Cross-Site Scripting | CVE-2025-58648 | theviper17y | September 22, 2025 | |
| 2 | Simple JWT Login <= 3.2.0 - Cross-Site Request Forgery | CVE-2021-24804 | apple502j | October 18, 2021 | |
| 3 | Simple JWT Login <= 3.2.1 - Insecure Password Creation | CVE-2021-24998 | Zian Choy | October 13, 2021 |
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