CVE-2026-26717
Medium
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
SeverityMedium
CVSS4.8
Exploit probability—
ProductRichie
PublishedFeb 25, 2026
First seenFeb 25, 2026
Weakness typeCWE-208CWE-208
How to fix
Update
- richie3.3.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| richiePyPI | v < 3.3.0 | 3.3.0 |
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