{"cve":"CVE-2026-26717","nvd":{"published":"2026-02-25T17:25:39.293","modified":"2026-06-17T10:26:15.757","status":"Deferred","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","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:L/A:N","score":4.8},"cwes":["CWE-208"],"references":["https://github.com/Rickidevs/CVE-2026-26717","https://github.com/openfun/richie/commit/a1b5bbda3403d7debb466c303a32852925fcba5f","https://medium.com/@ordogh/cve-2026-26717-hmac-timing-attack-in-openfun-richie-lms-f04377efe83d?postPublishedType=repub"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:24:17.937441719+00:00"},"epss":{"cve":"CVE-2026-26717","score":0.0044,"percentile":0.38251,"date":"2026-11-01"},"kev":null,"osv":[{"id":"GHSA-xjhr-fm27-4hmx","url":"https://osv.dev/vulnerability/GHSA-xjhr-fm27-4hmx","summary":"OpenFUN Richie Observable Timing Discrepancy in its sync_course_run_from_request function","modified":"2026-09-10T03:50:36.343231578Z","packages":[{"ecosystem":"PyPI","name":"richie","purl":"pkg:pypi/richie","ranges":["<3.3.0"],"fixed":["3.3.0"]}]},{"id":"PYSEC-2026-3052","url":"https://osv.dev/vulnerability/PYSEC-2026-3052","summary":"OpenFUN Richie Observable Timing Discrepancy in its sync_course_run_from_request function","modified":"2026-07-13T16:32:44.015583598Z","packages":[{"ecosystem":"PyPI","name":"richie","purl":"pkg:pypi/richie","ranges":["<3.3.0"],"fixed":["3.3.0"]}]}],"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."]}