CVE-2019-11763
6.1
MEDIUM
CVSS 3.1
EPSS 0.80%
Description
Failure to correctly handle null bytes when processing HTML entities resulted in Firefox incorrectly parsing these entities. This could have led to HTML comment text being treated as HTML which could have led to XSS in a web application under certain conditions. It could have also led to HTML entities being masked from filters - enabling the use of entities to mask the actual characters of interest from filters. This vulnerability affects Firefox < 70, Thunderbird < 68.2, and Firefox ESR < 68.2.
How to fix CVE-2019-11763
To remediate CVE-2019-11763, upgrade the affected package to a fixed version below.
- —upgrade to 68.2.0esr-1 or later
- —upgrade to 1:68.2.1-1 or later
Is CVE-2019-11763 being exploited?
Low — EPSS is 0.8%, meaning exploitation activity has not been observed at scale.
Affected packages (2)
- from 0, < 68.2.0esr-1
- from 0, < 1:68.2.1-1
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM6.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N |