CVE-2020-12670 Cross-site scripting in n/a
Attackers can execute arbitrary JavaScript via unsanitized HTML emails in Webmin's Read User Email module, potentially compromising user accounts.
- 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
- Available
What is CVE-2020-12670?
CVE-2020-12670 is a medium-severity cross-site scripting vulnerability in Webmin Webmin, published on 12 Oct 2020. 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
XSS exists in Webmin 1.941 and earlier affecting the Save function of the Read User Email Module / mailboxes Endpoint when attempting to save HTML emails. This module parses any output without sanitizing SCRIPT elements, as opposed to the View function, which sanitizes the input correctly. A malicious user can send any JavaScript payload into the message body and execute it if the user decides to save that email.
Weakness: CWE-79
Which versions are affected by CVE-2020-12670?
It affects 1 product.
Products include Webmin Webmin.
How do I fix CVE-2020-12670?
Upgrade to a fixed version.
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-2020-12670 being exploited?
There is no known exploitation of CVE-2020-12670 in the wild and no public exploit code.
Other vulnerabilities in Webmin Webmin
Sources
Also known as GHSA-xjf8-qhj9-9w5r.