cve/2021/CVE-2021-36539.md

### [CVE-2021-36539](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-36539)
![](https://img.shields.io/static/v1?label=Product&message=n%2Fa&color=blue)
![](https://img.shields.io/static/v1?label=Version&message=n%2Fa&color=blue)
![](https://img.shields.io/static/v1?label=Vulnerability&message=n%2Fa&color=brighgreen)

### Description

Instructure Canvas LMS didn't properly deny access to locked/unpublished files when the unprivileged user access the DocViewer based file preview URL (canvadoc_session_url).

### POC

#### Reference
- https://github.com/gaukas/instructure-canvas-file-oracle

#### Github
No PoCs found on GitHub currently.