Arbitrary file upload in Umbraco Cms

CVE-2020-9471

Umbraco Cloud 8.5.3 allows an authenticated file upload (and consequently Remote Code Execution) via the Install Packages functionality.

Vulnerability class: Unrestricted File Upload

Published · last modified .

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.023 (82.5th percentile), scored .

Low probability of exploitation in the next 30 days, but still tracked. 82nd percentile — 82.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2020-9471: held from 0.023 to 0.023.

EPSS over last 30 days · oldest: 0.023 · newest: 0.023 · change: 0.000

Affected products

Weakness classification (CWE)

Public proof-of-concept exploits

References

Frequently asked questions

What is CVE-2020-9471?
CVE-2020-9471 is a high-severity vulnerability in Umbraco Cms, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 8.8/10. Published 2020-03-16.
How severe is CVE-2020-9471?
High severity. CVSS v3 base score is 8.8 out of 10.
Is CVE-2020-9471 known to be exploited?
4 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.