Vulnerability in Mozilla Firefox

CVE-2019-9811

As part of a winning Pwn2Own entry, a researcher demonstrated a sandbox escape by installing a malicious language pack and then opening a browser feature that used the compromised translation. This vulnerability affects Firefox ESR < 60.8…

EPSS: 0.026 (83.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.3 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H.

Affected products

Weakness classification (CWE)

Public proof-of-concept exploits

References

Frequently asked questions

What is CVE-2019-9811?
CVE-2019-9811 is a high-severity vulnerability in Mozilla Firefox, classified under Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection). CVSS score: 8.3/10. Published 2019-07-23.
How severe is CVE-2019-9811?
High severity. CVSS v3 base score is 8.3 out of 10.
Is CVE-2019-9811 known to be exploited?
1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.