---
id: CVE-2025-55030
title: >-
  Firefox for iOS would not respect a Content-Disposition header of type
  Attachment and would incorrectly display the content inline rather than
  downloading, potentially allowing for XSS attacks
summary: >-
  Firefox for iOS would not respect a Content-Disposition header of type
  Attachment and would incorrectly display the content inline rather than
  downloading, potentially allowing for XSS attacks. This vulnerability was
  fixed in Firefox for…
severity: medium
cvss: 6.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N'
cwe:
  - CWE-640
vendor: mozilla
product: firefox
affected:
  - firefox < 142.0
patched:
  - firefox 142.0
published: '2025-08-19'
updated: '2026-09-30'
sourceUpdated: '2026-09-30T18:10:00.190'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-55030'
references:
  - url: 'https://bugzilla.mozilla.org/show_bug.cgi?id=1976304'
    label: security@mozilla.org
  - url: 'https://www.mozilla.org/security/advisories/mfsa2025-68/'
    label: security@mozilla.org
tags:
  - nvd
epss: 0.00158
epssPercentile: 0.04265
ingestedAt: '2026-09-30T18:17:24.454Z'
---

## Overview

Firefox for iOS would not respect a Content-Disposition header of type Attachment and would incorrectly display the content inline rather than downloading, potentially allowing for XSS attacks. This vulnerability was fixed in Firefox for iOS 142.

## Affected

- `firefox < 142.0`

## Remediation

Upgrade past the affected range:

- `firefox 142.0`