CVE-2026-32245
Tinyauth's OIDC authorization codes are not bound to client on token exchange
- State
- Published
- Severity
- 6.5 Medium
- 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 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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 6.5 Medium | CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:H/A:N | GitHub_M |
Weaknesses
- CWE-863 Incorrect Authorization
Affected Products
| Product | Versions |
|---|---|
tinyauthsteveiliop56 |
|
References
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