CVE-2026-8401

CRITICAL

Firefox < 150.0.3 - Sandbox Escape via Profile Backup Component

Title source: llm
STIX 2.1

Description

Sandbox escape in the Profile Backup component. This vulnerability was fixed in Firefox 150.0.3, Firefox ESR 115.36, Firefox ESR 140.11, and Thunderbird 140.11.

References (5)

Core 5

Scores

CVSS v3 9.8
EPSS 0.0008
EPSS Percentile 24.3%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CISA SSVC

Vulnrichment
Exploitation none
Automatable yes
Technical Impact total

Details

CWE
CWE-693
Status published
Products (5)
mozilla/firefox < 150.0.3
Mozilla/Firefox 115.36 - 115.*
Mozilla/Firefox 140.11 - 140.*
Mozilla/Firefox 150.0.3
Mozilla/Thunderbird 140.11
Published May 12, 2026
Tracked Since May 12, 2026