Information disclosure in Mozilla Firefox

CVE-2016-9904

An attacker could use a JavaScript Map/Set timing attack to determine whether an atom is used by another compartment/zone in specific contexts. This could be used to leak information, such as usernames embedded in JavaScript code, across websites. This vulnerability affects Firefox < 50.1, Firefox ESR < 45.6, and Thunderbird < 45.6.

Vulnerability class: Information Disclosure

EPSS: 0.028 (84.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2016-9904?
CVE-2016-9904 is a high-severity vulnerability in Mozilla Firefox, classified under Information Disclosure. CVSS score: 7.5/10. Published 2018-06-11.
How severe is CVE-2016-9904?
High severity. CVSS v3 base score is 7.5 out of 10.