openfun/richie · Security
OpenFUN Richie Observable Timing Discrepancy in its sync_course_run_from_request function
- GHSA ID
- GHSA-xjhr-fm27-4hmx
- CVE ID
- CVE-2026-26717
- Severity
- medium
- Published
- Updated
- CVSS
- 4.8 · CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
- CVSS v3
- 4.8 · CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
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.
CWEs
- CWE-208 · Observable Timing Discrepancy
References
- https://nvd.nist.gov/vuln/detail/CVE-2026-26717 ↗
- https://github.com/openfun/richie/commit/a1b5bbda3403d7debb466c303a32852925fcba5f ↗
- https://github.com/Rickidevs/CVE-2026-26717 ↗
- https://medium.com/@ordogh/cve-2026-26717-hmac-timing-attack-in-openfun-richie-lms-f04377efe83d?postPublishedType=repub ↗
- https://github.com/advisories/GHSA-xjhr-fm27-4hmx ↗