CVE-2026-32245— Tinyauth's OIDC authorization codes are not bound to client on token exchange
Quick assessment
Affected
steveiliop56 tinyauth
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.
Tinyauth是Stavros个人开发者的一个认证授权服务器。 Tinyauth 5.0.3之前版本存在安全漏洞，该漏洞源于OIDC令牌端点未验证交换授权码的客户端身份，可能导致恶意客户端操作员获取其他客户端的用户令牌。
Possible ATT&CK Techniques 1 AI
T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-32245
Vulnerability Information
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Vulnerability Title
Tinyauth's OIDC authorization codes are not bound to client on token exchange
Source: CVE Program / CVE List V5
Vulnerability Description
Tinyauth is an authentication and authorization server. Prior to 5.0.3, the OIDC token endpoint does not verify that the client exchanging an authorization code is the same client the code was issued to. A malicious OIDC client operator can exchange another client's authorization code using their own client credentials, obtaining tokens for users who never authorized their application. This violates RFC 6749 Section 4.1.3. This vulnerability is fixed in 5.0.3.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不正确
Source: CVE Program / CVE List V5
Vulnerability Title
Tinyauth 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Tinyauth是Stavros个人开发者的一个认证授权服务器。 Tinyauth 5.0.3之前版本存在安全漏洞，该漏洞源于OIDC令牌端点未验证交换授权码的客户端身份，可能导致恶意客户端操作员获取其他客户端的用户令牌。
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 |
|---|---|---|---|---|
| steveiliop56 | tinyauth | < 5.0.3 | - |
|
II. Public POCs for CVE-2026-32245
| # | POC Description | Source Link | Shenlong Link |
|---|
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Patches & Fixes for CVE-2026-32245 (1)
Vendor Advisories for CVE-2026-32245 (1)
Vendor Pages for CVE-2026-32245 (1)
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Release v5.0.3 · steveiliop56/tinyauth · GitHub x_refsource_MISC
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