CVEvulnerability

CVE-2026-26717

4.8 MEDIUM Published 2026-02-25 Modified 2026-06-17 Official page ↗

Status: Deferred
Published: 2026-02-25
Last modified: 2026-06-17
Assigner: [email protected]
CVSS 3.1 (134c704f-9b21-4f2e-91b3-4a467353bcc0): 4.8 MEDIUM — CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
Weaknesses: CWE-208

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

Weakness · CWE (1)

CWE-208 Observable Timing Discrepancy weakness

References

https://github.com/Rickidevs/CVE-2026-26717 github.com
https://github.com/openfun/richie/commit/a1b5bbda3403d7debb466c303a32852925fcba5f github.com
https://medium.com/@ordogh/cve-2026-26717-hmac-timing-attack-in-openfun-richie-lms-f04377efe83d?postPublishedType=repub medium.com

CVE-2026-26717

Description

Related

Weakness · CWE (1)

References