---
id: CVE-2020-26975
title: >-
  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
summary: >-
  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 resol…
severity: medium
cvss: 6.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N'
vendor: mozilla
product: firefox_mobile
affected:
  - firefox_mobile < 84.0
patched:
  - firefox_mobile 84.0
published: '2021-01-07'
updated: '2026-08-19'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2020-26975'
references:
  - url: 'https://bugzilla.mozilla.org/show_bug.cgi?id=1661071'
    label: security@mozilla.org
  - url: 'https://www.mozilla.org/security/advisories/mfsa2020-54/'
    label: security@mozilla.org
  - url: 'https://bugzilla.mozilla.org/show_bug.cgi?id=1661071'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://www.mozilla.org/security/advisories/mfsa2020-54/'
    label: af854a3a-2127-422b-91ae-364da2661108
tags:
  - nvd
epss: 0.00858
epssPercentile: 0.56632
ingestedAt: '2026-08-19T15:41:15.118Z'
---

## Overview

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

- `firefox_mobile < 84.0`

## Remediation

Upgrade past the affected range:

- `firefox_mobile 84.0`