CVE-2020-26963: Mozilla Firefox

Medium severity, CVSS 4.3. EPSS: 0.8% chance of exploitation in the next 30 days.

Repeated calls to the history and location interfaces could have been used to hang the browser. This was addressed by introducing rate-limiting to these API calls. This vulnerability affects Firefox < 83.

Affected products

• Mozilla Firefox: before 83.0 (fixed in 83.0)

Published 2020-12-09. Last modified 2026-06-17.