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CVE-2021-36539

Date: January 26, 2023

Instructure Canvas LMS didn't properly deny access to locked/unpublished files when the unprivileged user access the DocViewer based file preview URL (canvadoc_session_url).

Language: JS

Severity Score

Related Resources (4)

https://github.com/instructure/canvas-lms/issues/1905
https://nvd.nist.gov/vuln/detail/CVE-2021-36539
https://github.com/gaukas/instructure-canvas-file-oracle
https://www.mend.io/vulnerability-database/CVE-2021-36539

Severity Score

Weakness Type (CWE)

Information Leak / Disclosure

CWE-200

Authorization Bypass Through User-Controlled Key

CWE-639

CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): LOW
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): HIGH
Integrity (I): NONE
Availability (A): NONE

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