What is CVE-2021-36539?

CVE-2021-36539 is a medium-severity vulnerability in Instructure Canvas Learning Management Service, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 6.5/10. Published 2023-01-26.

How severe is CVE-2021-36539?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Auth bypass in Instructure Canvas Learning Management Service

CVE-2021-36539

Instructure Canvas LMS didn't properly deny access to locked/unpublished files when the unprivileged user access the DocViewer based file preview URL (canvadoc_session_url).

Vulnerability class: IDOR (Insecure Direct Object Reference)

EPSS: 0.009 (55.0th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.

Affected products

Instructure Canvas_learning_management_service
N/a — versions n/a

Weakness classification (CWE)

CWE-639 — Authorization Bypass Through User-Controlled Key

References

cve@mitre.org (Exploit, Third Party Advisory)
cve@mitre.org (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2021-36539?: CVE-2021-36539 is a medium-severity vulnerability in Instructure Canvas Learning Management Service, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 6.5/10. Published 2023-01-26.
How severe is CVE-2021-36539?: Medium severity. CVSS v3 base score is 6.5 out of 10.