CVE-2026-26717

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

Risk Information

Base Score

4.8

MODERATE

Vector

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

EPSS Score

Exploitation Probability

0.097

Associated Vulnerability

Vulnerability	OS Platform
Vulnerabilities CVE-2026-26717 are fixed in Python-richie 3.3.0	Windows
Vulnerabilities CVE-2026-26717 are fixed in Python-richie for linux 3.3.0	Linux

Patch Details

No records found

References

https://nvd.nist.gov/vuln/detail/CVE-2023-1234
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-1234