---
id: CVE-2024-3863
title: The executable file warning was not presented when downloading .xrm-ms files
summary: >-
  The executable file warning was not presented when downloading .xrm-ms
  files.  

  *Note: This issue only affected Windows operating systems. Other operating
  systems are unaffected.* This vulnerability affects Firefox < 125, Firefox ESR
  < 1…
severity: critical
cvss: 9.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-434
vendor: mozilla
product: firefox
affected:
  - firefox < 115.10.0
  - firefox < 125.0
  - thunderbird < 115.10
patched:
  - firefox 125.0
  - thunderbird 115.10
published: '2024-04-16'
updated: '2026-11-03'
sourceUpdated: '2026-11-03T22:17:22.940'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2024-3863'
references:
  - url: 'https://bugzilla.mozilla.org/show_bug.cgi?id=1885855'
    label: security@mozilla.org
  - url: 'https://www.mozilla.org/security/advisories/mfsa2024-18/'
    label: security@mozilla.org
  - url: 'https://www.mozilla.org/security/advisories/mfsa2024-19/'
    label: security@mozilla.org
  - url: 'https://www.mozilla.org/security/advisories/mfsa2024-20/'
    label: security@mozilla.org
  - url: 'https://bugzilla.mozilla.org/show_bug.cgi?id=1885855'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://www.mozilla.org/security/advisories/mfsa2024-18/'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://www.mozilla.org/security/advisories/mfsa2024-19/'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://www.mozilla.org/security/advisories/mfsa2024-20/'
    label: af854a3a-2127-422b-91ae-364da2661108
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2025-08-22T03:55:42.890384Z'
epss: 0.00812
epssPercentile: 0.57095
ingestedAt: '2026-11-05T06:38:03.564Z'
---

## Overview

The executable file warning was not presented when downloading .xrm-ms files.  
*Note: This issue only affected Windows operating systems. Other operating systems are unaffected.* This vulnerability affects Firefox < 125, Firefox ESR < 115.10, and Thunderbird < 115.10.

## Affected

- `firefox < 115.10.0`
- `firefox < 125.0`
- `thunderbird < 115.10`

## Remediation

Upgrade past the affected range:

- `firefox 125.0`
- `thunderbird 115.10`