CVE-2026-8960

HIGH

Firefox < 151.0.0 and Thunderbird < 151.0.0 - Authentication Bypass by Spoofing via WebExtensions

Title source: llm
STIX 2.1

Description

Spoofing issue in WebExtensions. This vulnerability was fixed in Firefox 151 and Thunderbird 151.

References (3)

Core 3

Scores

CVSS v3 7.5
EPSS 0.0003
EPSS Percentile 8.3%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

CISA SSVC

Vulnrichment
Exploitation none
Automatable yes
Technical Impact partial

Details

CWE
CWE-290
Status published
Products (4)
mozilla/firefox < 151.0.0
Mozilla/Firefox 151
mozilla/thunderbird < 151.0.0
Mozilla/Thunderbird 151
Published May 19, 2026
Tracked Since May 19, 2026