CVE-2026-26717

MEDIUM 4.8

CVSS Score

4.8

EPSS Score

0.0%

EPSS Percentile

0th

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

Vendor	n/a
Product	n/a
Published	Feb 25, 2026
Last Updated	Feb 26, 2026

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Affected Versions

n/a / n/a

n/a

References

NVD ↗ CVE.org ↗ EPSS Data ↗

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