CVE-2026-32245
Tinyauth's OIDC authorization codes are not bound to client on token exchange
CVSS Score
6.5
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-863 |
| Vendor | steveiliop56 |
| Product | tinyauth |
| Published | Mar 12, 2026 |
| Last Updated | Mar 12, 2026 |
Stay Ahead of the Next One
Get instant alerts for steveiliop56 tinyauth
Be the first to know when new medium vulnerabilities affecting steveiliop56 tinyauth are published — delivered to Slack, Telegram or Discord.
Get Free Alerts →
Free · No credit card · 60 sec setup
CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:H/A:N Attack Vector
Network
Attack Complexity
High
Privileges Required
Low
User Interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
High
Availability
None
Affected Versions
steveiliop56 / tinyauth
< 5.0.3