CVE-2020-26955: Mozilla Firefox Mobile

Medium severity, CVSS 6.5. EPSS: 0.8% chance of exploitation in the next 30 days.

When a user downloaded a file in Firefox for Android, if a cookie is set, it would have been re-sent during a subsequent file download operation on the same domain, regardless of whether the original and subsequent request were in private and non-private browsing modes. *Note: This issue only affected Firefox for Android. Other operating systems are unaffected.*. This vulnerability affects Firefox < 83.

Affected products

• Mozilla Firefox Mobile: before 83.0 (fixed in 83.0)

Published 2020-12-09. Last modified 2026-08-19.