What’s Vulnerable › Vulnerabilities

CVE-2020-26963

• Severity: medium (CVSS 4.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.8% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2020-12-09 · updated 2026-06-17

Description

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

How to fix

Upgrade to a fixed version: Mozilla Firefox 83.0. Check the vendor advisory for mitigations.

References

• https://bugzilla.mozilla.org/show_bug.cgi?id=1314912
• https://www.mozilla.org/security/advisories/mfsa2020-50/
• https://bugzilla.mozilla.org/show_bug.cgi?id=1314912
• https://www.mozilla.org/security/advisories/mfsa2020-50/

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