GitHub Advisoryadvisory · PyPI

GHSA-xjhr-fm27-4hmx OpenFUN Richie Observable Timing Discrepancy in its sync_course_run_from_request function

MEDIUM Published 2026-02-25 Modified 2026-02-26 Official page ↗
Aliases
CVE-2026-26717
Ecosystem
PyPI
Packages
richie
Severity
Moderate
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
Weaknesses
CWE-208
Reviewed
2026-02-26

Affected packages

• PyPI richie: < 3.3.0 → fixed in 3.3.0

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.

Related

Alias · CVE (1)

  • CVE-2026-26717 An issue in OpenFUN Richie (LMS) in src/richie/apps/courses/api.py. vulnerability

Weakness · CWE (1)

  • CWE-208 Observable Timing Discrepancy weakness

References