CVE-2026-26717
Quick assessment
Affected
n/a n/a
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
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。
Possible ATT&CK Techniques 1 AI
T1114 · Email Collection
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I. Basic Information for CVE-2026-26717
Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
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: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
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
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| - | n/a | n/a | - |
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II. Public POCs for CVE-2026-26717
| # | POC Description | Source Link | Shenlong Link |
|---|---|---|---|
| 1 | I 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-2026-26717 | POC Details |
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Proof of Concept for CVE-2026-26717 (1)
Same Patch Batch · n/a · 2026-02-25 · 6 CVEs total
| CVE-2026-3172 | 8.1 HIGH | pgvector buffer overflow in parallel HNSW index build |
| CVE-2026-3147 | 5.3 MEDIUM | libvips csvload.c vips_foreign_load_csv_build heap-based overflow |
| CVE-2026-3145 | 5.3 MEDIUM | libvips matrixload.c vips_foreign_load_matrix_header memory corruption |
| CVE-2026-3146 | 3.3 LOW | libvips matrixload.c vips_foreign_load_matrix_header null pointer dereference |
| CVE-2025-69771 | asbplayer 安全漏洞 |
IV. Related Vulnerabilities
V. Comments for CVE-2026-26717
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