Medium severity4.8NVD Advisory· Published Feb 25, 2026· Updated Apr 15, 2026

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

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LLM-synthesized narrative grounded in this CVE's description and references.

Affected packages

Versions sourced from the GitHub Security Advisory.

Package	Affected versions	Patched versions
richiePyPI	< 3.3.0	3.3.0

Affected products

Openfun/Richiereferences
ghsa-coords
pkg:pypi/richie
Range: < 3.3.0

Patches

Vulnerability mechanics

References

github.com/advisories/GHSA-xjhr-fm27-4hmxghsaADVISORY
nvd.nist.gov/vuln/detail/CVE-2026-26717ghsaADVISORY
github.com/openfun/richie/commit/a1b5bbda3403d7debb466c303a32852925fcba5fnvdWEB
medium.com/@ordogh/cve-2026-26717-hmac-timing-attack-in-openfun-richie-lms-f04377efe83dnvdWEB

News mentions

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cvss	0.312
epss	0.000
exploit	0.000
kev	0.000
patch	-0.070
ransomware	0.000