CVSS 3.1
4.8 mediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:NCVE-2026-26717
Medium (4.8). EPSS 0.4% chance of exploitation in the next 30 days. Fixed in richie 3.3.0.
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
Severity
- EPSS
- 0.4% chance of exploitation in the next 30 days; higher than 38% of CVEs (scores of 2026-10-31)
- CWE
- CWE-208
- Published
- Modified
- Record from
- the NVD, synced
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-xjhr-fm27-4hmx | PyPI | richie | <3.3.0 | 3.3.0 |
| PYSEC-2026-3052 | PyPI | richie | <3.3.0 | 3.3.0 |