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CVE-2026-14262— Simple JWT Login <= 3.6.6 - Authenticated (Subscriber+) Authentication Bypass to Privilege Escalation via 'payload' Parameter

Quick assessment

Affected
nicu_m Simple JWT Login – Allows you to use JWT on REST endpoints.
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

WordPress Simple JWT Login是WordPress基金会的一个用于在REST端点使用JWT的登录插件。 WordPress Simple JWT Login 3.6.6及之前版本存在权限许可和访问控制问题漏洞，该漏洞源于 函数仅覆盖管理员配置的 列表中存在的JWT payload键名，导致攻击者提供的身份声明（如 、 或 ）保持完整并使用站点HS2

CVSS 8.8 · High EPSS 0.74% · P55

Affected Version Matrix 1

VendorProduct Version RangeStatus
nicu_m Simple JWT Login – Allows you to use JWT on REST endpoints. ≤ 3.6.6 affected
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I. Basic Information for CVE-2026-14262

Vulnerability Information
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Vulnerability Title
Simple JWT Login <= 3.6.6 - Authenticated (Subscriber+) Authentication Bypass to Privilege Escalation via 'payload' Parameter
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
特权管理不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
WordPress Simple JWT Login 权限许可和访问控制问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
WordPress Simple JWT Login是WordPress基金会的一个用于在REST端点使用JWT的登录插件。 WordPress Simple JWT Login 3.6.6及之前版本存在权限许可和访问控制问题漏洞，该漏洞源于`AuthenticateService::generatePayload()`函数仅覆盖管理员配置的`jwt_payload`列表中存在的JWT payload键名，导致攻击者提供的身份声明（如`email`、`id`或`username`）保持完整并使用站点HS2
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
nicu_m Simple JWT Login – Allows you to use JWT on REST endpoints. 0 ~ 3.6.6 -

II. Public POCs for CVE-2026-14262

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III. Intelligence Information for CVE-2026-14262

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Patches & Fixes for CVE-2026-14262 (2)

Vendor Advisories for CVE-2026-14262 (1)

IV. Related Vulnerabilities

Same weakness: CWE-269