CVE-2019-11763
Medium
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.
SeverityMedium
CVSS6.1
Exploit probability—
Product
Mozilla Firefox
PublishedJan 8, 2020
First seenJan 8, 2020
How to fix
Update
- mozilla firefox70.0 or later
- mozilla firefox_esr68.2 or later
- mozilla thunderbird68.2 or later
Vendor advisories
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| mozilla firefox | v < 70.0 | 70.0 |
| mozilla firefox_esr | v < 68.2 | 68.2 |
| mozilla thunderbird | v < 68.2 | 68.2 |
| canonical ubuntu_linux | 16.04 | — |
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