CVE-2026-26717

Published Feb 25, 2026·Updated Jun 17, 2026

NVD 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

Public Exploits & PoCs1 found

PoC: CVE-2026-26717

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.

CVSS Vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N

References

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