CVE-2021-36539
MEDIUMCVSS 6.5/10EPSS 0.87%
Last modified
CVE-2021-36539 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. Instructure Canvas LMS didn't properly deny access to locked/unpublished files when the unprivileged user access the DocViewer based file preview URL (canvadoc_session_url).. EPSS estimates a 0.87% chance of exploitation in the next 30 days.
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Instructure Canvas LMS didn't properly deny access to locked/unpublished files when the unprivileged user access the DocViewer based file preview URL (canvadoc_session_url).
Metrics
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Instructure | Canvas Learning Management Service | < 2022-10-15 |
References
- https://github.com/gaukas/instructure-canvas-file-oracleExploit, Third Party Advisory
- https://github.com/instructure/canvas-lms/issues/1905Exploit, Third Party Advisory
- https://github.com/gaukas/instructure-canvas-file-oracleExploit, Third Party Advisory
- https://github.com/instructure/canvas-lms/issues/1905Exploit, Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is 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Instructure Canvas LMS didn't properly deny access to locked/unpublished files when the unprivileged user access the DocViewer based file preview URL (canvadoc_session_url).
How severe is CVE-2021-36539?
CVE-2021-36539 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 0.87% probability of exploitation in the next 30 days.
How do I fix CVE-2021-36539?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
Are you affected by CVE-2021-36539?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST