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CVE-2020-15084— Authorization bypass in express-jwt

Quick assessment

Affected
auth0 express-jwt
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Auth0 express-jwt是美国Auth0公司的一款支持通过jsonwebtoken模块验证JWT（JSON Web令牌）的软件包。 Auth0 express-jwt 5.3.3及之前版本（NPM软件包）中存在授权问题漏洞。攻击者可借助特制请求利用该漏洞绕过授权。

CVSS 7.7 · High EPSS 1.05% · P63

Possible ATT&CK Techniques 1 AI

T1528 · Steal Application Access Token
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I. Basic Information for CVE-2020-15084

Vulnerability Information
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Vulnerability Title
Authorization bypass in express-jwt
Source: CVE Program / CVE List V5
Vulnerability Description
In express-jwt (NPM package) up and including version 5.3.3, the algorithms entry to be specified in the configuration is not being enforced. When algorithms is not specified in the configuration, with the combination of jwks-rsa, it may lead to authorization bypass. You are affected by this vulnerability if all of the following conditions apply: - You are using express-jwt - You do not have **algorithms** configured in your express-jwt configuration. - You are using libraries such as jwks-rsa as the **secret**. You can fix this by specifying **algorithms** in the express-jwt configuration. See linked GHSA for example. This is also fixed in version 6.0.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Auth0 express-jwt 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Auth0 express-jwt是美国Auth0公司的一款支持通过jsonwebtoken模块验证JWT（JSON Web令牌）的软件包。 Auth0 express-jwt 5.3.3及之前版本（NPM软件包）中存在授权问题漏洞。攻击者可借助特制请求利用该漏洞绕过授权。
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
auth0 express-jwt <= 5.3.3 -

II. Public POCs for CVE-2020-15084

# POC Description Source Link Shenlong Link
AI-Generated POC Verified env Premium
Reproduced successfully in a real sandbox · Below is the actual recording of building the environment and exploiting the vulnerability.
Success marker: VULNERABLE: forged HS256 JWT accepted by express-jwt 5.3.3 (no algorithms) -> /protected returned 200 with secret PROOF_cbb511f47654f975 (authorization bypass)
Reproduction recording is a Pro+ exclusive
Watch the full sandbox build + live exploit recording for this CVE. Limited-time ¥499/mo.
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claude_code · 4177 chars
GitHub 复现环境（可 clone 直接跑）
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III. Intelligence Information for CVE-2020-15084

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Patches & Fixes for CVE-2020-15084 (1)

Vendor Advisories for CVE-2020-15084 (1)

IV. Related Vulnerabilities

Same vendor: auth0
Same weakness: CWE-285

V. Comments for CVE-2020-15084

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