CVE-2026-26717

An issue in OpenFUN Richie (LMS) in src/richie/apps/courses/api.py

Medium · published February 25, 2026

CVSS v3.1
4.8
EPSS
1%
Percentile
43.3
In the wild
Unconfirmed
What it is

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

The record
Technical detail
CVSS v3.1
4.8 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
CVSS v4.0
Not supplied
EPSS
0.00520 · 43.3th percentile
Published
2026-02-25T00:00Z
EPSS history
Timeline
  • 25 FEB 00:00Z
    An issue in OpenFUN Richie (LMS) in src/richie/apps/courses/api.py
    cvelistv5