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CVE-2026-26717 is a timing side-channel vulnerability in OpenFUN Richie (LMS) within src/richie/apps/courses/api.py. The sync_course_run_from_request function verifies an HMAC signature using the non-constant-time equality operator (==) rather than a constant-time comparison. Because the comparison may return earlier on partial mismatches, an attacker can measure response-time discrepancies across repeated requests to iteratively infer/forge a valid signature, enabling authentication bypass for requests protected by this HMAC verification logic.
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No valid public exploits. Mallory filtered out 1 candidate as fakes, detection scripts, or README-only repos.
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1 sources tracked across advisories and community write-ups. News coverage will land here when it surfaces.
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Cross-references every affected SKU, including bundled OEM variants.
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