{"id":"CVE-2026-26717","aliases":["EUVD-2026-8680","GHSA-xjhr-fm27-4hmx","PYSEC-2026-3052"],"status":"published","title":"OpenFUN Richie Observable Timing Discrepancy in its sync_course_run_from_request function","description":"An issue in OpenFUN Richie (LMS) in src/richie/apps/courses/api.py. The application used the non-constant time == operator for HMAC signature verification in the sync_course_run_from_request function. This allows remote attackers to forge valid signatures and bypass authentication by measuring response time discrepancies","severity":{"version":"3.1","score":4.8,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N","level":"medium","assessor":"adp","from":"cve"},"epss":{"day":"2026-11-12","score":0.0044,"percentile":0.38719,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":true,"fix_available":true},"cwes":["CWE-208"],"published":"2026-02-25T00:00:00Z","modified":"2026-10-28T02:31:13Z","exploits":[{"source":"pocgithub","id":"Rickidevs/CVE-2026-26717","title":"Rickidevs/CVE-2026-26717","date":"2026-02-24","url":"https://github.com/Rickidevs/CVE-2026-26717"}],"fixes":[{"ecosystem":"PyPI","package":"richie","fixed_in":["3.3.0"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"PyPI","package":"richie","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.3.0"}]}]},{"source":"osv","ecosystem":"PyPI","package":"richie","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.3.0"}]}],"versions":["0.1.0","1.0.0","1.0.0b0","1.0.0b1","1.0.0b2","1.0.0b3","1.0.0b4","1.0.0b5","1.0.0b6","1.0.0b7","1.0.0b8","1.0.0b9","1.0.1","1.1.0","1.10.0","1.11.0","1.12.0","1.12.1","1.13.0","1.14.0","1.14.1","1.15.0","1.16.0","1.16.1","1.16.2","1.17.0","1.2.0","1.3.0","1.4.0","1.4.1","1.5.0","1.5.1","1.5.2","1.6.0","1.6.1","1.7.0","1.7.1","1.7.2","1.7.3","1.8.0","1.8.1","1.8.2","1.8.3","1.9.0","1.9.1","1.9.2","2.0.0","2.0.0b0","2.0.0b1","2.0.0b11","2.0.0b12","2.0.0b13","2.0.0b14","2.0.0b15","2.0.0b16","2.0.0b17","2.0.0b18","2.0.0b19","2.0.0b2","2.0.0b20","2.0.0b21","2.0.0b22","2.0.0b3","2.0.0b4","2.0.0b5","2.0.0b6","2.0.0b7","2.0.0b8","2.0.0b9","2.0.1","2.1.0","2.10.0","2.11.0","2.12.0","2.13.0","2.14.0","2.14.1","2.15.0","2.15.1","2.16.0","2.17.0","2.18.0","2.19.0","2.2.0","2.20.0","2.20.1","2.21.0","2.21.1","2.22.0","2.23.0","2.24.0","2.24.1","2.25.0","2.25.1","2.26.0","2.27.0","2.28.0","2.28.1","2.29.0","2.29.1","2.29.2","2.3.0","2.3.1","2.3.2","2.3.3","2.30.0","2.31.0","2.32.0","2.33.0","2.34.0","2.4.0","2.5.0","2.6.0","2.7.0","2.7.1","2.8.0","2.8.1","2.8.2","2.9.0","2.9.1","3.0.0","3.0.0b0","3.1.0","3.1.1","3.1.2","3.2.0","3.2.1"]},{"source":"osv","ecosystem":"PyPI","package":"richie","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.3.0"}]}],"versions":["0.1.0","1.0.0","1.0.0b0","1.0.0b1","1.0.0b2","1.0.0b3","1.0.0b4","1.0.0b5","1.0.0b6","1.0.0b7","1.0.0b8","1.0.0b9","1.0.1","1.1.0","1.10.0","1.11.0","1.12.0","1.12.1","1.13.0","1.14.0","1.14.1","1.15.0","1.16.0","1.16.1","1.16.2","1.17.0","1.2.0","1.3.0","1.4.0","1.4.1","1.5.0","1.5.1","1.5.2","1.6.0","1.6.1","1.7.0","1.7.1","1.7.2","1.7.3","1.8.0","1.8.1","1.8.2","1.8.3","1.9.0","1.9.1","1.9.2","2.0.0","2.0.0b0","2.0.0b1","2.0.0b11","2.0.0b12","2.0.0b13","2.0.0b14","2.0.0b15","2.0.0b16","2.0.0b17","2.0.0b18","2.0.0b19","2.0.0b2","2.0.0b20","2.0.0b21","2.0.0b22","2.0.0b3","2.0.0b4","2.0.0b5","2.0.0b6","2.0.0b7","2.0.0b8","2.0.0b9","2.0.1","2.1.0","2.10.0","2.11.0","2.12.0","2.13.0","2.14.0","2.14.1","2.15.0","2.15.1","2.16.0","2.17.0","2.18.0","2.19.0","2.2.0","2.20.0","2.20.1","2.21.0","2.21.1","2.22.0","2.23.0","2.24.0","2.24.1","2.25.0","2.25.1","2.26.0","2.27.0","2.28.0","2.28.1","2.29.0","2.29.1","2.29.2","2.3.0","2.3.1","2.3.2","2.3.3","2.30.0","2.31.0","2.32.0","2.33.0","2.34.0","2.4.0","2.5.0","2.6.0","2.7.0","2.7.1","2.8.0","2.8.1","2.8.2","2.9.0","2.9.1","3.0.0","3.0.0b0","3.1.0","3.1.1","3.1.2","3.2.0","3.2.1"]}],"references":[{"url":"https://github.com/openfun/richie/commit/a1b5bbda3403d7debb466c303a32852925fcba5f","tags":["fix","web"]},{"url":"https://github.com/Rickidevs/CVE-2026-26717","tags":["package","web"]},{"url":"https://medium.com/@ordogh/cve-2026-26717-hmac-timing-attack-in-openfun-richie-lms-f04377efe83d?postPublishedType=repub","tags":["web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-26717","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-xjhr-fm27-4hmx","tags":["advisory"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/26xxx/CVE-2026-26717.json","tags":["advisory"]},{"url":"https://github.com/openfun/richie","tags":["package"]},{"url":"https://pypi.org/project/richie","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2026-26717","description":"An issue in OpenFUN Richie (LMS) in src/richie/apps/courses/api.py. The application used the non-constant time == operator for HMAC signature verification in the sync_course_run_from_request function. This allows remote attackers to forge valid signatures and bypass authentication by measuring response time discrepancies","status":"published","published":"2026-02-25T00:00:00Z","modified":"2026-02-26T19:11:04.934Z","cvss":[{"version":"3.1","score":4.8,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N","level":"medium","assessor":"adp"}],"cwes":["CWE-208"],"updated_at":"2026-11-02T13:38:20.971157Z"}],"euvd":[{"id":"EUVD-2026-8680","description":"An issue in OpenFUN Richie (LMS) in src/richie/apps/courses/api.py. The application used the non-constant time == operator for HMAC signature verification in the sync_course_run_from_request function. This allows remote attackers to forge valid signatures and bypass authentication by measuring response time discrepancies","status":"published","published":"2026-02-25T00:00:00Z","modified":"2026-02-26T19:11:04Z","cvss":[{"version":"3.1","score":4.8,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T19:48:14.645703Z"}],"ghsa":[{"id":"GHSA-xjhr-fm27-4hmx","title":"OpenFUN Richie Observable Timing Discrepancy in its sync_course_run_from_request function","description":"An issue in OpenFUN Richie (LMS) in src/richie/apps/courses/api.py. The application used the non-constant time == operator for HMAC signature verification in the sync_course_run_from_request function. This allows remote attackers to forge valid signatures and bypass authentication by measuring response time discrepancies.","status":"published","published":"2026-02-25T18:31:38Z","modified":"2026-02-26T22:50:20Z","cvss":[{"version":"3.1","score":4.8,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N","level":"medium"}],"cwes":["CWE-208"],"updated_at":"2026-11-02T14:39:27.949248Z"}],"nvd":[{"id":"CVE-2026-26717","description":"An issue in OpenFUN Richie (LMS) in src/richie/apps/courses/api.py. The application used the non-constant time == operator for HMAC signature verification in the sync_course_run_from_request function. This allows remote attackers to forge valid signatures and bypass authentication by measuring response time discrepancies","status":"published","published":"2026-02-25T17:25:39.293Z","modified":"2026-06-17T10:26:15.757Z","cvss":[{"version":"3.1","score":4.8,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N","level":"medium","assessor":"secondary"}],"cwes":["CWE-208"],"updated_at":"2026-11-02T14:12:07.027269Z"}],"osv":[{"id":"CVE-2026-26717","description":"An issue in OpenFUN Richie (LMS) in src/richie/apps/courses/api.py. The application used the non-constant time == operator for HMAC signature verification in the sync_course_run_from_request function. This allows remote attackers to forge valid signatures and bypass authentication by measuring response time discrepancies","status":"published","published":"2026-02-25T00:00:00Z","modified":"2026-10-28T02:31:13.024372638Z","cvss":[{"version":"3.1","score":4.8,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T15:44:59.80315Z"},{"id":"GHSA-xjhr-fm27-4hmx","title":"OpenFUN Richie Observable Timing Discrepancy in its sync_course_run_from_request function","description":"An issue in OpenFUN Richie (LMS) in src/richie/apps/courses/api.py. The application used the non-constant time == operator for HMAC signature verification in the sync_course_run_from_request function. This allows remote attackers to forge valid signatures and bypass authentication by measuring response time discrepancies.","status":"published","published":"2026-02-25T18:31:38Z","modified":"2026-09-10T03:50:36.343231578Z","cvss":[{"version":"3.1","score":4.8,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N","level":"medium"}],"cwes":["CWE-208"],"updated_at":"2026-11-02T15:47:00.198893Z"},{"id":"PYSEC-2026-3052","title":"OpenFUN Richie Observable Timing Discrepancy in its sync_course_run_from_request function","description":"An issue in OpenFUN Richie (LMS) in src/richie/apps/courses/api.py. The application used the non-constant time == operator for HMAC signature verification in the sync_course_run_from_request function. This allows remote attackers to forge valid signatures and bypass authentication by measuring response time discrepancies.","status":"published","published":"2026-07-13T14:36:38.520323Z","modified":"2026-07-13T16:32:44.015583598Z","cvss":[{"version":"3.1","score":4.8,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T15:52:56.429374Z"}]}}