Simple JWT Login <= 3.6.6 — Authenticated (Subscriber+) Authentication Bypass to Privilege Escalation via 'payload' Parameter
CVE-2026-14262Published · Updated Action summary
Affected: ≤3.6.6Update to 3.6.7 or newer
All remediation steps- Severity
- High8.8
- CVSS
- 8.8CVSS 3.1 · CNA (Wordfence)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HWhat does this vector mean?
AV:NAttack vector- Network
AC:LAttack complexity- Low
PR:LPrivileges required- Low
UI:NUser interaction- None
S:UScope- Unchanged
C:HConfidentiality- High
I:HIntegrity- High
A:HAvailability- High
- Weakness
- CWE-269 Privilege Escalation
- Required access
- Unknown
- Exploit prediction (EPSS)
- No score
- CISA KEV
- Not listed
On this page8
Am I affected?
Simple JWT Login – Allows you to use JWT on REST endpoints. simple-jwt-login
- Affected≤ 3.6.6
- Patched in3.6.7
Update to 3.6.7 or newer.
You are affected if you run ≤ 3.6.6. Version 3.6.7 and later are not affected by this issue.
- Check your version: in wp-admin go to Plugins → Installed Plugins and read the version under Simple JWT Login – Allows you to use JWT on REST endpoints..
- No admin access? Run a passive check of your site. It reads public files only.
What to do
- Update to version 3.6.7, or a newer patched version
- Rotate administrator passwords and application secrets if the site ran a vulnerable version while publicly reachable.
- Watch Simple JWT Login – Allows you to use JWT on REST endpoints. to get an email when the next vulnerability is published.
Advisory
Source description from Wordfence Intelligence, credited to Navapon Premkasem (71C4) (71C4).
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.
Exploits & references
Proof-of-concept & detection
No public proof-of-concept or detection template is known for this vulnerability.
Advisories & patches
- Advisorywordfence.com
Related CVEs
More in Simple JWT Login – Allows you to use JWT on REST endpoints.
All 6| Severity | Vulnerability | CVE | Published |
|---|---|---|---|
| Medium4.3 | Missing Authorization 4.0.0 – 4.0.0No patch available | CVE-2026-39793 | |
| High7.3 | Unauthenticated Privilege Escalation <3.6.8Update to 3.6.8 | CVE-2026-19714 | |
| Medium6.4 | Authenticated (Contributor+) Stored Cross-Site Scripting ≤3.6.4Update to 3.6.5 | CVE-2025-58648 | |
| High8.8 | Cross-Site Request Forgery <3.2.1Update to 3.2.1 | CVE-2021-24804 | |
| High7.5 | Insecure Password Creation <3.3.0Update to 3.3.0 | CVE-2021-24998 |
- Medium4.3Missing Authorization
4.0.0 – 4.0.0No patch available
- High7.3Unauthenticated Privilege Escalation
<3.6.8Update to 3.6.8
- Medium6.4Authenticated (Contributor+) Stored Cross-Site Scripting
≤3.6.4Update to 3.6.5
- High8.8Cross-Site Request Forgery
<3.2.1Update to 3.2.1
- High7.5Insecure Password Creation
<3.3.0Update to 3.3.0
Same weakness (Privilege Escalation)
All Privilege Escalation| Severity | Vulnerability | CVE | Published |
|---|---|---|---|
| High7.2 | Unauthenticated Stored Cross-Site Scripting via Comment User-Agent Header | CVE-2026-120688 | |
| Critical9.8 | Unauthenticated Arbitrary File Upload via File Upload via Public Form Submission | CVE-2026-125055 | |
| Critical9.8 | Unauthenticated PHP Object Injection to Remote Code Execution via 'form' Parameter | CVE-2026-119077 | |
| Medium5.3 | Unauthenticated Sensitive Information Exposure in 'search' Parameter | CVE-2026-121518 |
- High7.2Unauthenticated Stored Cross-Site Scripting via Comment User-Agent Header
EZ SQL Reports Shortcode Widget and DB Backup
≤5.25.25Update to 5.26.45
- Critical9.8Unauthenticated Arbitrary File Upload via File Upload via Public Form Submission
Chatterbug Forms – Fast, Flexible WordPress Form Builder
≤1.0.2Update to 1.1
- Critical9.8Unauthenticated PHP Object Injection to Remote Code Execution via 'form' Parameter
ELEX WordPress HelpDesk & Customer Ticketing System
≤3.3.9Update to 3.4.0
- Medium5.3Unauthenticated Sensitive Information Exposure in 'search' Parameter
Customer Reviews for WooCommerce
≤5.127.0Update to 5.128.0
Timeline
CVE published
Severity high, CVSS 8.8
Record last updated
Sources & licenses
Wordfence record- Vulnerability data
- Wordfence Intelligence. Copyright 2012-2026 Defiant Inc. Licensed under the CC BY-SA 4.0.
- CVE® identifiers
- Copyright 1999-2026 The MITRE Corporation. Used under the CVE Program. CVE® is a registered trademark of The MITRE Corporation.
- CVSS / CWE
- National Vulnerability Database (NVD), shown unmodified. This product uses the NVD API but is not endorsed or certified by the NVD.
- VulnCrest content
- Summary, remediation guidance and page layout © VulnCrest. Not sourced from NVD.