CVE-2021-36539

6.5
MEDIUMCVSS v3.1 Base Score
0.87%
LOW RiskEPSS (58th percentile)

Instructure Canvas LMS didn't properly deny access to locked/unpublished files when the unprivileged user access the DocViewer based file preview URL (canvadoc_session_url).

Published: 1/26/2023
Modified: 6/17/2026
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Vulnerability Summary

CVSS v3 Score

6.5MEDIUM

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

EPSS Score (Exploitation Probability)

0.87%LOW Exploitation Risk
58th percentile

This vulnerability has a 0.87% probability of being exploited in the next 30 days, ranking higher than 58% of all scored CVEs.

CWE Classification

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