CVE-2020-15676 Cross-site scripting in Firefox
Attackers can execute JavaScript by pasting malicious data into contenteditable elements due to improper DOM sanitization 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-2020-15676?
CVE-2020-15676 is a medium-severity cross-site scripting vulnerability in Debian Debian Linux, published on 1 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
Firefox sometimes ran the onload handler for SVG elements that the DOM sanitizer decided to remove, resulting in JavaScript being executed after pasting attacker-controlled data into a contenteditable element. This vulnerability affects Firefox < 81, Thunderbird < 78.3, and Firefox ESR < 78.3.
Weakness: CWE-79
Which versions are affected by CVE-2020-15676?
It affects 5 products.
Products include Debian Debian Linux, Mozilla Firefox, Mozilla Firefox Esr, Mozilla Thunderbird, Opensuse Leap.
How do I fix CVE-2020-15676?
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-2020-15676 being exploited?
There is no known exploitation of CVE-2020-15676 in the wild and no public exploit code.
Other vulnerabilities in Debian Debian Linux
Sources
Also known as DEBIAN-CVE-2020-15676, GHSA-m5jf-7x3g-f295, UBUNTU-CVE-2020-15676.