High severity7.7NVD Advisory· Published Apr 2, 2026· Updated Apr 7, 2026
CVE-2026-33544
CVE-2026-33544
Description
Tinyauth is an authentication and authorization server. Prior to version 5.0.5, all three OAuth service implementations (GenericOAuthService, GithubOAuthService, GoogleOAuthService) store PKCE verifiers and access tokens as mutable struct fields on singleton instances shared across all concurrent requests. When two users initiate OAuth login for the same provider concurrently, a race condition between VerifyCode() and Userinfo() causes one user to receive a session with the other user's identity. This issue has been patched in version 5.0.5.
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Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
github.com/steveiliop56/tinyauthGo | < 1.0.1-0.20260401140714-fc1d4f2082a5 | 1.0.1-0.20260401140714-fc1d4f2082a5 |
Affected products
2Patches
Vulnerability mechanics
References
5- github.com/steveiliop56/tinyauth/commit/f26c2171610d5c2dfbba2edb6ccd39490e349803nvdPatchWEB
- github.com/steveiliop56/tinyauth/security/advisories/GHSA-9q5m-jfc4-wc92nvdExploitMitigationVendor AdvisoryWEB
- github.com/advisories/GHSA-9q5m-jfc4-wc92ghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2026-33544ghsaADVISORY
- github.com/steveiliop56/tinyauth/releases/tag/v5.0.5nvdProductRelease NotesWEB
News mentions
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