CVE-2019-11720 Cross-site scripting in Firefox
Attackers can bypass XSS filters by using specific Unicode characters treated as whitespace, allowing malicious code execution in Firefox.
- 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-2019-11720?
CVE-2019-11720 is a medium-severity cross-site scripting vulnerability in Mozilla Firefox, published on 23 Jul 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
Some unicode characters are incorrectly treated as whitespace during the parsing of web content instead of triggering parsing errors. This allows malicious code to then be processed, evading cross-site scripting (XSS) filtering. This vulnerability affects Firefox < 68.
Weakness: CWE-79
Which versions are affected by CVE-2019-11720?
It affects 2 products.
Products include Mozilla Firefox, Opensuse Leap.
How do I fix CVE-2019-11720?
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-2019-11720 being exploited?
There is no known exploitation of CVE-2019-11720 in the wild and no public exploit code.
Other vulnerabilities in Mozilla Firefox
Sources
Also known as GHSA-c4xq-jjr6-4q6x, UBUNTU-CVE-2019-11720.