---
id: CVE-2020-15661
title: >-
  A rogue webpage could override the injected WKUserScript used by the logins
  autofill, this exploit could result in leaking a password for the current
  domain
summary: >-
  A rogue webpage could override the injected WKUserScript used by the logins
  autofill, this exploit could result in leaking a password for the current
  domain. 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:H/I:N/A:N'
cwe:
  - CWE-522
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-2020-15661'
references:
  - url: 'https://bugzilla.mozilla.org/show_bug.cgi?id=1654131'
    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=1654131'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://www.mozilla.org/security/advisories/mfsa2020-34/'
    label: af854a3a-2127-422b-91ae-364da2661108
tags:
  - nvd
epss: 0.00845
epssPercentile: 0.56254
ingestedAt: '2026-08-19T15:41:14.405Z'
---

## Overview

A rogue webpage could override the injected WKUserScript used by the logins autofill, this exploit could result in leaking a password for the current domain. This vulnerability affects Firefox for iOS < 28.

## Affected

- `firefox_mobile < 28.0`

## Remediation

Upgrade past the affected range:

- `firefox_mobile 28.0`