Rickidevs/CVE-2026-26717

Rickidevs/CVE-2026-26717

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I discovered a Timing Attack vulnerability in the Richie LMS, developed by France Université Numérique (OpenFUN), and it was assigned the ID CVE-2026-26717 by MITRE.
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CVE History

CVEPublishedCVSS v3CVSS v2
CVE-2026-26717↗
4.8 MEDIUM—

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