VULNERABILITY INTELLIGENCE
CVE-2026-26717
CVSS score4.8 MEDIUM
EPSS probability0.44%
CISA KEVNot currently listed
Published2026-02-25
Last modified2026-06-17
CVSS vectorCVSS: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
Weakness classification
- 134c704f-9b21-4f2e-91b3-4a467353bcc0: CWE-208