CVE-2026-26717

MEDIUM
2026-02-25 [email protected] GHSA-xjhr-fm27-4hmx
4.8
CVSS 3.1
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CVSS Vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
None

Lifecycle Timeline

3
Patch Released
Mar 31, 2026 - 21:13 nvd
Patch available
Analysis Generated
Mar 12, 2026 - 21:55 vuln.today
CVE Published
Feb 25, 2026 - 17:25 nvd
MEDIUM 4.8

Tags

Authentication Bypass

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

Analysis

OpenFUN Richie LMS's course synchronization API uses non-constant-time comparison for HMAC signature validation, allowing remote attackers to forge valid signatures through timing analysis and bypass authentication controls. This vulnerability affects the sync_course_run_from_request function and requires no user interaction, though successful exploitation demands careful timing measurements. …

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Remediation

Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Monitor vendor channels for patch availability.

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Priority Score

24
Low Medium High Critical
KEV: 0
EPSS: +0.1
CVSS: +24
POC: 0

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CVE-2026-26717 vulnerability details – vuln.today
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