CVE-2026-14262 Privilege escalation in Simple JWT Login – Allows you to use JWT on REST endpoints.
Authenticated subscribers can escalate privileges to Administrator by injecting identity claims into the JWT payload parameter.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-14262?
CVE-2026-14262 is a high-severity vulnerability in nicu_m Simple JWT Login – Allows you to use JWT on REST endpoints., published on 11 Jul 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Weakness: CWE-269
Which versions are affected by CVE-2026-14262?
How do I fix CVE-2026-14262?
No fix has been published for CVE-2026-14262 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-14262 being exploited?
There is no known exploitation of CVE-2026-14262 in the wild and no public exploit code.
Sources
Also known as GHSA-4f4m-2qm7-575f.