CVE-2026-33544

HIGH

7.7

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 CVE

Score CVSS v3.17.7

SeveriteHIGH

Vecteur CVSSCVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:N

Vecteur d'attaqueNETWORK

ComplexiteHIGH

Privileges requisLOW

Interaction utilisateurREQUIRED

Publie4/2/2026

Derniere modification4/3/2026

Sourcenvd

Observations honeypot0

Faiblesses (CWE)

CWE-362

References

https://github.com/steveiliop56/tinyauth/commit/f26c2171610d5c2dfbba2edb6ccd39490e349803(security-advisories@github.com)

https://github.com/steveiliop56/tinyauth/releases/tag/v5.0.5(security-advisories@github.com)

https://github.com/steveiliop56/tinyauth/security/advisories/GHSA-9q5m-jfc4-wc92(security-advisories@github.com)

Correlations IOC

Aucune correlation enregistree

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