What is CVE-2026-26717?

CVE-2026-26717 is a medium-severity vulnerability in N/a, classified under CWE-208. CVSS score: 4.8/10. Published 2026-02-25.

How severe is CVE-2026-26717?

Medium severity. CVSS v3 base score is 4.8 out of 10.

Vulnerability in N/a

CVE-2026-26717

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

EPSS: 0.004 (30.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 4.8 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N.

Affected products

N/a — versions n/a

Weakness classification (CWE)

CWE-208

References

cve@mitre.org
cve@mitre.org
cve@mitre.org

Frequently asked questions

What is CVE-2026-26717?: CVE-2026-26717 is a medium-severity vulnerability in N/a, classified under CWE-208. CVSS score: 4.8/10. Published 2026-02-25.
How severe is CVE-2026-26717?: Medium severity. CVSS v3 base score is 4.8 out of 10.