CVE-2019-11763 — Cross-site Scripting in Mozilla Firefox
Severity
6.1MEDIUMNVD
OSV8.8OSV7.5
EPSS
2.2%
top 15.45%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
Timeline
PublishedJan 8
Latest updateMay 24
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:NExploitability: 2.8 | Impact: 2.7
Affected Packages8 packages
Also affects: Ubuntu Linux 16.04
🔴Vulnerability Details
6GHSA▶
GHSA-94c9-r5wv-7vj8: Failure to correctly handle null bytes when processing HTML entities resulted in Firefox incorrectly parsing these entities↗2022-05-24
OSV▶
CVE-2019-11763: Failure to correctly handle null bytes when processing HTML entities resulted in Firefox incorrectly parsing these entities↗2020-01-08
CVEList▶
CVE-2019-11763: Failure to correctly handle null bytes when processing HTML entities resulted in Firefox incorrectly parsing these entities↗2020-01-08