XSS in Mozilla Firefox

CVE-2019-11720

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.

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.011 (61.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2019-11720?
CVE-2019-11720 is a medium-severity vulnerability in Mozilla Firefox, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2019-07-23.
How severe is CVE-2019-11720?
Medium severity. CVSS v3 base score is 6.1 out of 10.