{"cve":"CVE-2026-32245","nvd":{"published":"2026-03-12T19:16:19.413","modified":"2026-06-17T10:35:25.133","status":"Analyzed","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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N","score":6.5},"cwes":["CWE-863"],"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"],"products":["tinyauth:tinyauth"],"source":"nvd","synced_at":"2026-10-19T22:25:53.701907451+00:00"},"epss":{"cve":"CVE-2026-32245","score":0.00265,"percentile":0.185,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-xg2q-62g2-cvcm","url":"https://osv.dev/vulnerability/GHSA-xg2q-62g2-cvcm","summary":"Tinyauth's OIDC authorization codes are not bound to client on token exchange","modified":"2026-03-24T21:17:28.371865Z","packages":[{"ecosystem":"Go","name":"github.com/steveiliop56/tinyauth","purl":"pkg:golang/github.com/steveiliop56/tinyauth","ranges":["<1.0.1-20260311144920-9eb2d33064b7"],"fixed":["1.0.1-20260311144920-9eb2d33064b7"]}]},{"id":"GO-2026-4689","url":"https://osv.dev/vulnerability/GO-2026-4689","summary":"Tinyauth's OIDC authorization codes are not bound to client on token exchange in github.com/steveiliop56/tinyauth","modified":"2026-03-23T04:52:55.595862Z","packages":[{"ecosystem":"Go","name":"github.com/steveiliop56/tinyauth","purl":"pkg:golang/github.com/steveiliop56/tinyauth","ranges":["all versions"],"fixed":[]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}