Vulnerability · Published Mar 12, 2026 · Assigned by GitHub_M

CVE-2026-32246Tinyauth vulnerable to TOTP/2FA bypass via OIDC authorize endpoint

High 8.5

In plain English

A high-severity improper authentication in tinyauth from steveiliop56. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 21% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)8.5High

Exploit odds (30 days)0.3%top 79.3% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Go	github.com/steveiliop56/tinyauth	1.0.1-20260311144920-9eb2d33064b7	GHSA-3q28-qjrv-qr39
Go	github.com/steveiliop56/tinyauth	no fix listed	GO-2026-4688

Affected products (as reported)

Vendor	Product	Versions
steveiliop56	tinyauth	< 5.0.3

Weakness: CWE-287 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:H/A:N

References

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