CVE-2026-32245
Medium
Description
Tinyauth is an authentication and authorization server. Prior to 5.0.3, the OIDC token endpoint does not verify that the client exchanging an authorization code is the same client the code was issued to. A malicious OIDC client operator can exchange another client's authorization code using their own client credentials, obtaining tokens for users who never authorized their application. This violates RFC 6749 Section 4.1.3. This vulnerability is fixed in 5.0.3.
SeverityMedium
CVSS6.5
Exploit probability—
ProductTinyauth
PublishedMar 12, 2026
First seenMar 12, 2026
Weakness typeCWE-863Incorrect authorization
How to fix
Update
- github.com/steveiliop56/tinyauth1.0.1-20260311144920-9eb2d33064b7 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| tinyauth tinyauth | v ≤ 5.0.2 | — |
| github.com/steveiliop56/tinyauthGo | v < 1.0.1-20260311144920-9eb2d33064b7, No range specified | 1.0.1-20260311144920-9eb2d33064b7 |
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