---
id: CVE-2026-74950
title: Privilege escalation in the Downloads API component
summary: >-
  Privilege escalation in the Downloads API component. This vulnerability was
  fixed in Firefox 154, Firefox ESR 153.1, Thunderbird 154, and Thunderbird
  153.1.
severity: high
cvss: 8.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H'
cvssSource: adp
vendor: Mozilla
product: Firefox
affected:
  - Firefox
  - Thunderbird
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-08-20T00:00:00+00:00'
published: '2026-08-18'
updated: '2026-10-28'
sourceUpdated: '2026-10-28T16:35:54.828Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-74950'
references:
  - url: 'https://bugzilla.mozilla.org/show_bug.cgi?id=1880253'
  - url: 'https://www.mozilla.org/security/advisories/mfsa2026-74/'
  - url: 'https://www.mozilla.org/security/advisories/mfsa2026-77/'
  - url: 'https://www.mozilla.org/security/advisories/mfsa2026-78/'
  - url: 'https://www.mozilla.org/security/advisories/mfsa2026-80/'
tags:
  - cve.org
epss: 0.00415
epssPercentile: 0.36001
ingestedAt: '2026-10-28T17:14:44.476Z'
---

## Overview

Privilege escalation in the Downloads API component. This vulnerability was fixed in Firefox 154, Firefox ESR 153.1, Thunderbird 154, and Thunderbird 153.1.

## Affected

- `Firefox`
- `Thunderbird`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.