CVE-2026-32246

Tinyauth vulnerable to TOTP/2FA bypass via OIDC authorize endpoint

State: Published
Severity: 8.5 High
Published: Mar 12, 2026
Updated: Mar 12, 2026
Reserved: Mar 11, 2026

Description

Tinyauth is an authentication and authorization server. Prior to 5.0.3, the OIDC authorization endpoint allows users with a TOTP-pending session (password verified, TOTP not yet completed) to obtain authorization codes. An attacker who knows a user's password but not their TOTP secret can obtain valid OIDC tokens, completely bypassing the second factor. This vulnerability is fixed in 5.0.3.

Scores

CVSS	Score	Vector	Source
3.1	8.5 High	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:H/A:N	GitHub_M

Weaknesses

CWE-287 Improper Authentication

Affected Products

Product	Versions
tinyauthsteveiliop56	< 5.0.3Affected

References

https://github.com/steveiliop56/tinyauth/security/advisories/GHSA-3q28-qjrv-qr39

Every record here comes from the CVE Program’s CVE List. © 1999–2026 The MITRE Corporation. CVE is a registered trademark of The MITRE Corporation. The records are reproduced under the CVE Program terms of use.