CVE-2026-26717
OpenFUN Richie Observable Timing Discrepancy in its sync_course_run_from_request function
4.8
MEDIUM
CVSS 3.1
EPSS 0.08%
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.
How to fix CVE-2026-26717
To remediate CVE-2026-26717, upgrade the affected package to a fixed version below.
- —upgrade to 3.3.0 or later
Is CVE-2026-26717 being exploited?
Low — EPSS is 0.1%, meaning exploitation activity has not been observed at scale.
Affected packages (1)
- from 0, < 3.3.0
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM4.8 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N |