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CVE-2026-33544— Tinyauth has OAuth account confusion via shared mutable state on singleton service instances

Quick assessment

Affected
steveiliop56 tinyauth
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.

Tinyauth是Stavros个人开发者的一个认证授权服务器。 Tinyauth 5.0.5之前版本存在竞争条件问题漏洞，该漏洞源于OAuth服务存在竞争条件，可能导致会话劫持。

CVSS 7.7 · High EPSS 0.33% · P24

Possible ATT&CK Techniques 1 AI

T1078 · Valid Accounts
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I. Basic Information for CVE-2026-33544

Vulnerability Information
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Vulnerability Title
Tinyauth has OAuth account confusion via shared mutable state on singleton service instances
Source: CVE Program / CVE List V5
Vulnerability Description
Tinyauth is an authentication and authorization server. Prior to version 5.0.5, all three OAuth service implementations (GenericOAuthService, GithubOAuthService, GoogleOAuthService) store PKCE verifiers and access tokens as mutable struct fields on singleton instances shared across all concurrent requests. When two users initiate OAuth login for the same provider concurrently, a race condition between VerifyCode() and Userinfo() causes one user to receive a session with the other user's identity. This issue has been patched in version 5.0.5.
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
使用共享资源的并发执行不恰当同步问题(竞争条件)
Source: CVE Program / CVE List V5
Vulnerability Title
Tinyauth 竞争条件问题漏洞
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 5.0.5之前版本存在竞争条件问题漏洞，该漏洞源于OAuth服务存在竞争条件，可能导致会话劫持。
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 < 5.0.5 -

II. Public POCs for CVE-2026-33544

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 7550 chars
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Exploit chain & mitigation
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III. Intelligence Information for CVE-2026-33544

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Vendor Advisories for CVE-2026-33544 (1)

IV. Related Vulnerabilities

Same product: tinyauth
Same vendor: steveiliop56
Same weakness: CWE-362

V. Comments for CVE-2026-33544

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