{"id":"CVE-2026-26717","details":"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","aliases":["GHSA-xjhr-fm27-4hmx","PYSEC-2026-3052"],"modified":"2026-08-12T03:51:37.568802861Z","published":"2026-02-25T00:00:00Z","database_specific":{"cna_assigner":"mitre","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/26xxx/CVE-2026-26717.json"},"references":[{"type":"WEB","url":"https://medium.com/@ordogh/cve-2026-26717-hmac-timing-attack-in-openfun-richie-lms-f04377efe83d?postPublishedType=repub"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/26xxx/CVE-2026-26717.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-26717"},{"type":"FIX","url":"https://github.com/openfun/richie/commit/a1b5bbda3403d7debb466c303a32852925fcba5f"},{"type":"PACKAGE","url":"https://github.com/Rickidevs/CVE-2026-26717"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/openfun/richie","events":[{"introduced":"0"},{"fixed":"a1b5bbda3403d7debb466c303a32852925fcba5f"}],"database_specific":{"source":"REFERENCES"}}],"versions":["v3.2.1","v3.2.0","v3.1.2","v3.1.1","v3.1.0","v3.0.0","v3.0.0-beta.0","v2.34.0","v2.33.0","v2.32.0","v2.31.0","v2.30.0","v2.29.2","v2.29.1","v2.29.0","v2.28.1","v2.28.0","v2.27.0","v2.26.0","v2.25.1","v2.25.0","v2.25.0-beta.1","v2.25.0-beta.0","v2.23.0","v2.22.0","v2.21.1","v2.21.0","v2.20.1","v2.20.0","v2.19.0","v2.18.0","v2.17.0","v2.16.0","v2.15.1","v2.15.0","v2.14.1","v2.14.0","v2.13.0","v2.12.0","v2.11.0","v2.10.0","v2.9.1","v2.9.0","v2.8.2","v2.8.1","v2.8.0","v2.7.1","v2.7.0","v2.6.0","v2.5.0","v2.4.0","v2.3.3","v2.3.2","v2.3.1","v2.3.0","v2.2.0","v2.1.0","v2.0.1","v2.0.0","v2.0.0-beta.22","v2.0.0-beta.20","v2.0.0-beta.19","v2.0.0-beta.18","v2.0.0-beta.17","v2.0.0-beta.16","v2.0.0-beta.15","v2.0.0-beta.14","v2.0.0-beta.13","v2.0.0-beta.12","v2.0.0-beta.11","v2.0.0-beta.10","v2.0.0-beta.9","v2.0.0-beta.8","v2.0.0-beta.7","v2.0.0-beta.6","v2.0.0-beta.5","v2.0.0-beta.4","v2.0.0-beta.3","v2.0.0-beta.2","v2.0.0-beta.1","v2.0.0-beta.0","v1.17.0","v1.16.2","v1.16.1","v1.16.0","v1.15.0","v1.14.1","v1.14.0","v1.13.0","v1.12.1","v1.12.0","v1.11.0","v1.10.0","v1.9.2","v1.9.1","v1.9.0","v1.8.3","v1.8.2","v1.8.1","v1.8.0","v1.7.1","v1.7.0","v1.6.1","v1.6.0","v1.5.2","v1.5.1","v1.5.0","v1.4.1","v1.4.0","v1.3.0","v1.2.0","v1.1.0","v1.0.1","v1.0.0","v1.0.0-beta.9","v1.0.0-beta.8","v1.0.0-beta.7","v1.0.0-beta.6","v1.0.0-beta.5","v1.0.0-beta.4","v1.0.0-beta.3","v1.0.0-beta.2","v1.0.0-beta.1","v1.0.0-beta.0","v0.2.0","v0.1.0","v0.1.0-alpha.3","v0.1.0-alpha.1"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-26717.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N"}]}