CVE-2021-43721 Cross-site scripting in n/a
Attackers can execute arbitrary code via XSS in markdown notes, potentially compromising the server.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2021-43721?
CVE-2021-43721 is a medium-severity cross-site scripting vulnerability in n/a, published on 28 Mar 2022. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
Leanote 2.7.0 is vulnerable to Cross Site Scripting (XSS) in the markdown type note. This leads to remote code execution with payload : <video src=x onerror=(function(){require('child_process').exec('calc');})();>
Weakness: CWE-79
Which versions are affected by CVE-2021-43721?
It affects 1 product.
Products include Leanote Leanote.
How do I fix CVE-2021-43721?
No fix has been published for CVE-2021-43721 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-2021-43721 being exploited?
There is no known exploitation of CVE-2021-43721 in the wild and no public exploit code.
Other vulnerabilities in n/a
Sources
Also known as GHSA-8mh9-7j76-5m8p.