CVE-2019-9807 Cross-site scripting in Firefox
Attackers can inject arbitrary text into modal alerts via FTP connections, enabling social engineering attacks against Firefox users.
- 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-2019-9807?
CVE-2019-9807 is a medium-severity cross-site scripting vulnerability in Mozilla Firefox, published on 26 Apr 2019. 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
When arbitrary text is sent over an FTP connection and a page reload is initiated, it is possible to create a modal alert message with this text as the content. This could potentially be used for social engineering attacks. This vulnerability affects Firefox < 66.
Weakness: CWE-20
Which versions are affected by CVE-2019-9807?
It affects 1 product.
Products include Mozilla Firefox.
How do I fix CVE-2019-9807?
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-2019-9807 being exploited?
There is no known exploitation of CVE-2019-9807 in the wild and no public exploit code.
Other vulnerabilities in Mozilla Firefox
Sources
Also known as GHSA-7785-cqjm-vp4q, UBUNTU-CVE-2019-9807.