What’s Vulnerable › Vulnerabilities

CVE-2026-32245: Tinyauth's OIDC authorization codes are not bound to client on token exchange

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-03-12 · updated 2026-06-17
• Weakness: CWE-863

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.

Affected products

• steveiliop56 tinyauth: through 5.0.2

References

• https://github.com/steveiliop56/tinyauth/commit/b2a1bfb1f532e87f205fa3afa3fc9f148c53ab89
• https://github.com/steveiliop56/tinyauth/releases/tag/v5.0.3
• https://github.com/steveiliop56/tinyauth/security/advisories/GHSA-xg2q-62g2-cvcm

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