🛡️ CVE-2026-33544
🟠 CVSS 8.0 — High ✅ No Known Exploit CWE-362 NVD
8.0
CVSS Score
0 Low4 Medium7 High9 Critical10

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.

Details

Severity HIGH
CVSS Score 8.0
CVSS Vector CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:N
CWE CWE-362
Public Exploit ✅ No
Source NVD
Published 2026-04-01
Updated 2026-06-02
Modified 2026-04-06

Affected Packages

Software From version Fixed in
github.com/steveiliop56/tinyauth — —
tinyauth — 5.0.5

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