---
id: CVE-2023-29538
title: >-
  Under specific circumstances a WebExtension may have received a
  <code>jar:file:///</code> URI instead of a <code>moz-extension:///</code> URI
  during a load request
summary: >-
  Under specific circumstances a WebExtension may have received a
  <code>jar:file:///</code> URI instead of a <code>moz-extension:///</code> URI
  during a load request. This leaked directory paths on the user's machine. This
  vulnerability af…
severity: medium
cvss: 4.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N'
cwe:
  - CWE-668
vendor: mozilla
product: firefox
affected:
  - firefox < 112.0
  - firefox_mobile < 112.0
  - focus < 112.0
patched:
  - firefox 112.0
  - firefox_mobile 112.0
  - focus 112.0
published: '2023-06-02'
updated: '2026-08-19'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2023-29538'
references:
  - url: 'https://bugzilla.mozilla.org/show_bug.cgi?id=1685403'
    label: security@mozilla.org
  - url: 'https://www.mozilla.org/security/advisories/mfsa2023-13/'
    label: security@mozilla.org
  - url: 'https://bugzilla.mozilla.org/show_bug.cgi?id=1685403'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://www.mozilla.org/security/advisories/mfsa2023-13/'
    label: af854a3a-2127-422b-91ae-364da2661108
tags:
  - nvd
epss: 0.004
epssPercentile: 0.31477
ingestedAt: '2026-08-19T15:41:15.548Z'
---

## Overview

Under specific circumstances a WebExtension may have received a <code>jar:file:///</code> URI instead of a <code>moz-extension:///</code> URI during a load request. This leaked directory paths on the user's machine. This vulnerability affects Firefox for Android < 112, Firefox < 112, and Focus for Android < 112.

## Affected

- `firefox < 112.0`
- `firefox_mobile < 112.0`
- `focus < 112.0`

## Remediation

Upgrade past the affected range:

- `firefox 112.0`
- `firefox_mobile 112.0`
- `focus 112.0`