{"id":"CVE-2026-33544","revision":"58a78fd3ad86412b866dad4003e8022a","records":[{"revision":"58a78fd3ad86412b866dad4003e8022a","observedAt":"2026-10-27T09:02:55.767+00:00","statement":{"source":"nvd","id":"CVE-2026-33544","aliases":[],"title":"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 f…","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.","state":0,"publishedAt":"2026-04-02T15:16:39.553+00:00","modifiedAt":"2026-10-26T22:10:00.163+00:00","affected":[],"metrics":[{"system":"CVSS 3.1 · security-advisories@github.com · Secondary","vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:N","score":7.7,"severity":"HIGH"}],"references":["https://github.com/steveiliop56/tinyauth/commit/f26c2171610d5c2dfbba2edb6ccd39490e349803","https://github.com/steveiliop56/tinyauth/releases/tag/v5.0.5","https://github.com/steveiliop56/tinyauth/security/advisories/GHSA-9q5m-jfc4-wc92"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-33544","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Analyzed","weaknesses":["CWE-362"],"productCriteria":["cpe:2.3:a:tinyauth:tinyauth:*:*:*:*:*:*:*:*"],"sourceDates":{"published":"2026-04-02T15:16:39.553","lastModified":"2026-10-26T22:10:00.163"},"relatedAdvisories":[],"note":"NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2026-33544","identifiers":["CVE-2026-33544"]},"retained":false,"historicalAffected":[]}],"coverage":[]}