Simple JWT Login <= 3.6.6 - Authenticated (Subscriber+) Authentication Bypass to Privilege Escalation via 'payload' Parameter
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.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| WordPress plugin | Simple JWT Login – Allows you to use JWT on REST endpoints. | <= 3.6.6 | 3.6.7 |
References
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H- Weakness (CWE)
CWE-269- Platform
- WordPress
- Package
Simple JWT Login – Allows you to use JWT on REST endpoints.- Disclosed
- 10.07.2026
- Updated
- 11.10.2026 10:23
Sources and licenses
Wordfence Intelligence - cd97a7a4-9f57-4882-9e3e-0e9853416af9 - Wordfence Intelligence
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Copyright 2012-2026 Defiant Inc.
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Vulnerability history: Simple JWT Login – Allows you to use JWT on REST endpoints.
All published vulnerabilities of this package (WordPress plugin), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 6
- First → latest
- 10.2021 10.2026
- Without a fix
- 1
- Exploited in attacks
- 0
Severity breakdown
- High 4
- Medium 2
Disclosures per year
- 2021: 2
- 2022: 0
- 2023: 0
- 2024: 0
- 2025: 1
- 2026: 3
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Simple JWT Login <= 3.6.6 - Authenticated (Subscriber+) Authentication Bypass to Privilege Escalation via 'payload' Parameter this entry
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