{"id":"CVE-2023-25403","aliases":["EUVD-2023-29358","GHSA-vc6m-w3jh-f5fx"],"status":"published","title":"CleverStupidDog yf-exam v 1.8.0 is vulnerable to Authentication Bypass. The program uses a fixed...","description":"CleverStupidDog yf-exam v 1.8.0 is vulnerable to Authentication Bypass. The program uses a fixed JWT key, and the stored key uses username format characters. Any user who logged in within 24 hours. A token can be forged with his username to bypass authentication.","severity":{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"high","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-09","score":0.00652,"percentile":0.5155,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-639"],"published":"2023-03-03T00:00:00Z","modified":"2026-06-17T05:41:11Z","products":[{"vendor":"yf-exam_project","product":"yf-exam"}],"references":[{"url":"https://github.com/CleverStupidDog/yf-exam/issues/2","tags":["x_transferred","Exploit","Issue Tracking","Third Party Advisory"]},{"url":"https://github.com/Fw-fW-fw/UPDATE-CVE/blob/main/CVE-2023-25403","tags":["x_transferred","Third Party Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2023-25403"},{"url":"https://github.com/advisories/GHSA-vc6m-w3jh-f5fx"}],"sources":{"cve":[{"id":"CVE-2023-25403","description":"CleverStupidDog yf-exam v 1.8.0 is vulnerable to Authentication Bypass. The program uses a fixed JWT key, and the stored key uses username format characters. Any user who logged in within 24 hours. A token can be forged with his username to bypass authentication.","status":"published","published":"2023-03-03T00:00:00Z","modified":"2025-03-07T16:39:28.313Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"high","assessor":"adp"}],"cwes":["CWE-639"],"updated_at":"2026-11-02T14:35:19.559321Z"}],"euvd":[{"id":"EUVD-2023-29358","description":"CleverStupidDog yf-exam v 1.8.0 is vulnerable to Authentication Bypass. The program uses a fixed JWT key, and the stored key uses username format characters. Any user who logged in within 24 hours. A token can be forged with his username to bypass authentication.","status":"published","published":"2023-03-03T00:00:00Z","modified":"2025-03-07T16:39:28Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"high"}],"updated_at":"2026-11-02T20:53:10.661676Z"}],"ghsa":[{"id":"GHSA-vc6m-w3jh-f5fx","title":"CleverStupidDog yf-exam v 1.8.0 is vulnerable to Authentication Bypass. The program uses a fixed...","description":"CleverStupidDog yf-exam v 1.8.0 is vulnerable to Authentication Bypass. The program uses a fixed JWT key, and the stored key uses username format characters. Any user who logged in within 24 hours. A token can be forged with his username to bypass authentication.","status":"published","published":"2023-03-04T00:30:16Z","modified":"2023-03-18T05:03:19Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"high"}],"cwes":["CWE-639"],"updated_at":"2026-11-02T14:54:21.374342Z"}],"nvd":[{"id":"CVE-2023-25403","description":"CleverStupidDog yf-exam v 1.8.0 is vulnerable to Authentication Bypass. The program uses a fixed JWT key, and the stored key uses username format characters. Any user who logged in within 24 hours. A token can be forged with his username to bypass authentication.","status":"published","published":"2023-03-03T23:15:12.14Z","modified":"2026-06-17T05:41:11.32Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"high","assessor":"primary"},{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"high","assessor":"secondary"}],"cwes":["CWE-639"],"updated_at":"2026-11-02T14:07:48.342507Z"}]}}