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Medium · 4.8 Public exploit CVE-2026-26717 EUVD-2026-8680GHSA-xjhr-fm27-4hmxPYSEC-2026-3052

OpenFUN Richie Observable Timing Discrepancy in its sync_course_run_from_request function

Published Feb 25, 2026 · Updated Feb 26, 2026 · Assigned by mitre

Package: richie Ecosystem: PyPI

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

Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.

Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.

GitHub 1 repository

  • Rickidevs/CVE-2026-26717 ★ 0 · Feb 24, 2026

    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.

Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.

Affected packages

EcosystemPackageAffectedFixedRecord
PyPI richie < 3.3.0 3.3.0 GHSA-xjhr-fm27-4hmx

References