CVE-2026-26717
Medium · 4.8CVSS
4.8
EPSS
0.5%
Published
Feb 25, 2026
CISA due date
—
The record
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
Affected packages
| Ecosystem | Package | Introduced | Fixed |
|---|---|---|---|
| PyPI | richie | 0 | 3.3.0 |
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