---
id: CVE-2020-15662
title: >-
  A rogue webpage could override the injected WKUserScript used by the download
  feature, this exploit could result in the user downloading an unintended file
summary: >-
  A rogue webpage could override the injected WKUserScript used by the download
  feature, this exploit could result in the user downloading an unintended file.
  This vulnerability affects Firefox for iOS < 28.
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 < 28.0
patched:
  - firefox_mobile 28.0
published: '2020-08-10'
updated: '2026-08-19'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2020-15662'
references:
  - url: 'https://bugzilla.mozilla.org/show_bug.cgi?id=1653827'
    label: security@mozilla.org
  - url: 'https://www.mozilla.org/security/advisories/mfsa2020-34/'
    label: security@mozilla.org
  - url: 'https://bugzilla.mozilla.org/show_bug.cgi?id=1653827'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://www.mozilla.org/security/advisories/mfsa2020-34/'
    label: af854a3a-2127-422b-91ae-364da2661108
tags:
  - nvd
epss: 0.00674
epssPercentile: 0.50016
ingestedAt: '2026-08-19T15:41:14.442Z'
---

## Overview

A rogue webpage could override the injected WKUserScript used by the download feature, this exploit could result in the user downloading an unintended file. This vulnerability affects Firefox for iOS < 28.

## Affected

- `firefox_mobile < 28.0`

## Remediation

Upgrade past the affected range:

- `firefox_mobile 28.0`