CVE-2021-36539 Missing authorization in n/a
Unprivileged users can access locked or unpublished files via DocViewer preview URLs, exposing sensitive content.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2021-36539?
CVE-2021-36539 is a medium-severity missing authorization vulnerability in n/a, published on 26 Jan 2023. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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Instructure Canvas LMS didn't properly deny access to locked/unpublished files when the unprivileged user access the DocViewer based file preview URL (canvadoc_session_url).
Weakness: CWE-639
Which versions are affected by CVE-2021-36539?
1 open source package ship an affected version, including canvaslms. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
canvaslms Bitnami | All versions | 2022-10-15.0.0 |
Products include Instructure Canvas Learning Management Service.
How do I fix CVE-2021-36539?
Upgrade canvaslms to 2022-10-15.0.0 or later.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2021-36539 being exploited?
There is no known exploitation of CVE-2021-36539 in the wild and no public exploit code.
Other vulnerabilities in n/a
Sources
Also known as BIT-canvaslms-2021-36539, GHSA-pw89-gxgv-mjvm.