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    CVE-2026-26717

    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

    Published:Feb 25, 2026
    Last Modified:Apr 18, 2026
    EPS:Feb 25, 2026
    EPSS Score:0.00097
    CVSS Score:4.8

    Affected Products

    Vendor
    Openfun
    Product
    Richie

    Exploits

    https://github.com/Rickidevs/CVE-2026-26717

    Common Weakness Enumeration

    CWE-208 Observable Timing Discrepancy

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High