CVE-2026-8958

HIGH

Information disclosure, sandbox escape in the Security: Process Sandboxing component

Title source: cna
STIX 2.1

Description

Information disclosure, sandbox escape in the Security: Process Sandboxing component. This vulnerability was fixed in Firefox 151, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.

References (5)

Core 5

Scores

CVSS v3 8.6
EPSS 0.0004
EPSS Percentile 13.6%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N

CISA SSVC

Vulnrichment
Exploitation none
Automatable yes
Technical Impact partial

Details

CWE
CWE-668 CWE-693
Status published
Products (8)
mozilla/firefox < 140.11.0
mozilla/firefox < 151.0.0
Mozilla/Firefox 140.11 - 140.*
Mozilla/Firefox 151
mozilla/thunderbird < 140.11
mozilla/thunderbird < 151.0.0
Mozilla/Thunderbird 140.11 - 140.*
Mozilla/Thunderbird 151
Published May 19, 2026
Tracked Since May 19, 2026