---
id: CVE-2026-100823
title: Spoofing issue in the Downloads component in Firefox for Android
summary: >-
  Spoofing issue in the Downloads component in Firefox for Android. This
  vulnerability was fixed in Firefox 157.
severity: medium
cvss: 5.4
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:L'
cwe:
  - CWE-451
vendor: mozilla
product: firefox_mobile
affected:
  - firefox_mobile < 157.0
patched:
  - firefox_mobile 157.0
published: '2026-09-29'
updated: '2026-10-05'
sourceUpdated: '2026-10-05T16:58:57.867'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-100823'
references:
  - url: 'https://bugzilla.mozilla.org/show_bug.cgi?id=2054384'
    label: security@mozilla.org
  - url: 'https://www.mozilla.org/security/advisories/mfsa2026-97/'
    label: security@mozilla.org
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-100823.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-100823'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2543162'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-100823'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-100823'
  - url: 'https://www.mozilla.org/security/advisories/mfsa2026-97/#CVE-2026-100823'
tags:
  - nvd
  - cve.org
  - csaf
  - vex
  - red-hat
  - score-dispute
epss: 0.00164
epssPercentile: 0.05519
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-30T19:46:51.030163Z'
ingestedAt: '2026-09-29T13:34:31.677Z'
scores:
  nvd: 5.4
  vendor: 3.4
---

## Overview

Spoofing issue in the Downloads component in Firefox for Android. This vulnerability was fixed in Firefox 157.

## Affected

- `firefox_mobile < 157.0`

## Remediation

Upgrade past the affected range:

- `firefox_mobile 157.0`

## Vendor advisories

- **Red Hat VEX** · Low · updated 2026-10-16 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-100823.json)