CVE-2026-32245

MEDIUM

6.5

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.

CVE Details

CVSS v3.1 Score6.5

SeverityMEDIUM

CVSS VectorCVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:H/A:N

Attack VectorNETWORK

ComplexityHIGH

Privileges RequiredLOW

User InteractionREQUIRED

Published3/12/2026

Last Modified3/19/2026

Sourcenvd

Honeypot Sightings0

Affected Products

tinyauth:tinyauth

Weaknesses (CWE)

CWE-863

References

https://github.com/steveiliop56/tinyauth/commit/b2a1bfb1f532e87f205fa3afa3fc9f148c53ab89(security-advisories@github.com)

https://github.com/steveiliop56/tinyauth/releases/tag/v5.0.3(security-advisories@github.com)

https://github.com/steveiliop56/tinyauth/security/advisories/GHSA-xg2q-62g2-cvcm(security-advisories@github.com)

IOC Correlations

No correlations recorded

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