CVE-2020-5810 Cross-site scripting in Umbraco CMS
Authenticated users can upload malicious SVG files to execute stored XSS attacks, potentially compromising other users' sessions.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2020-5810?
CVE-2020-5810 is a medium-severity cross-site scripting vulnerability in Umbraco Umbraco Cms, published on 30 Dec 2020. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
A stored XSS vulnerability exists in Umbraco CMS <= 8.9.1 or current. An authenticated user authorized to upload media can upload a malicious .svg file which act as a stored XSS payload.
Weakness: CWE-79
Which versions are affected by CVE-2020-5810?
It affects 1 product.
Products include Umbraco Umbraco Cms.
How do I fix CVE-2020-5810?
No fix has been published for CVE-2020-5810 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2020-5810 being exploited?
There is no known exploitation of CVE-2020-5810 in the wild and no public exploit code.
Other vulnerabilities in Umbraco Umbraco Cms
- CVE-2025-67288 Umbraco CMS has an arbitrary file upload vulnerability
- CVE-2014-10074 File upload in n/a
- CVE-2012-1301 Server-side request forgery in n/a
- CVE-2012-10054 Umbraco CMS < 4.7.1 codeEditorSave.asmx RCE
- CVE-2025-32017 Umbraco has a Management API Vulnerability to Path Traversal With Authenticated Users
Sources
Also known as GHSA-qv67-8hwr-88xh.