Vulnerability DatabaseCVE-2026-26717
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CVE-2026-26717
February 25, 2026
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
Affected Packages
https://github.com/openfun/richie.git (GITHUB):
Affected version(s) >=v0.1.0-alpha <v3.3.0
Fix Suggestion:
Update to version v3.3.0
richie (PYTHON):
Affected version(s) >=0.1.0 <3.3.0
Fix Suggestion:
Update to version 3.3.0
Related Resources (5)
https://github.com/Rickidevs/CVE-2026-26717
https://nvd.nist.gov/vuln/detail/CVE-2026-26717
https://github.com/openfun/richie
https://medium.com/@ordogh/cve-2026-26717-hmac-timing-attack-in-openfun-richie-lms-f04377efe83d?postPublishedType=repub
https://github.com/openfun/richie/commit/a1b5bbda3403d7debb466c303a32852925fcba5f
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CVSS v4
Base Score:
6.3
Attack Vector
NETWORK
Attack Complexity
HIGH
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
LOW
Vulnerable System Integrity
LOW
Vulnerable System Availability
NONE
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
4.8
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
LOW
Availability
NONE
Weakness Type (CWE)
Observable Timing Discrepancy
CWE-208
EPSS
Base Score:
0.09