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I. Basic Information for CVE-2026-26717
Vulnerability Information
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Vulnerability Title
N/A
Source: NVD (National Vulnerability Database)
Vulnerability 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
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Title
Richie 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Richie是France Université Numérique开源的一个教育内容管理系统。 Richie存在安全漏洞，该漏洞源于sync_course_run_from_request函数中使用非恒定时间==运算符进行HMAC签名验证，可能导致远程攻击者通过测量响应时间差异伪造有效签名并绕过身份验证。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
VendorProductAffected VersionsCPESubscribe
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II. Public POCs for CVE-2026-26717
#POC DescriptionSource LinkShenlong Link
1I discovered a Timing Attack vulnerability in the Richie LMS, developed by France Université Numérique (OpenFUN), and it was assigned the ID CVE-2026-26717 by MITRE.https://github.com/Rickidevs/CVE-2026-26717POC Details
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III. Intelligence Information for CVE-2026-26717
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IV. Related Vulnerabilities
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Same vendor: n/a
V. Comments for CVE-2026-26717

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