CVE-2020-26975: Mozilla Firefox Mobile

Medium severity, CVSS 6.5. EPSS: 0.9% chance of exploitation in the next 30 days.

When a malicious application installed on the user's device broadcast an Intent to Firefox for Android, arbitrary headers could have been specified, leading to attacks such as abusing ambient authority or session fixation. This was resolved by only allowing certain safe-listed headers. *Note: This issue only affected Firefox for Android. Other operating systems are unaffected.*. This vulnerability affects Firefox < 84.

Affected products

• Mozilla Firefox Mobile: before 84.0 (fixed in 84.0)

Published 2021-01-07. Last modified 2026-08-19.