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 (29)

Core 29
Core References

Scores

CVSS v3 9.8
EPSS 0.0031
EPSS Percentile 23.3%
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-653 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