CVE-2025-1019

MEDIUM

Firefox < 135.0 and Thunderbird 131.0-134.0 - UI Spoofing via Fullscreen Notification Z-Order Manipulation

Title source: llm

Description

The z-order of the browser windows could be manipulated to hide the fullscreen notification. This could potentially be leveraged to perform a spoofing attack. This vulnerability was fixed in Firefox 135 and Thunderbird 135.

References (3)

Core 3

Core References

Permissions Required

https://bugzilla.mozilla.org/show_bug.cgi?id=1940162

Vendor Advisory

https://www.mozilla.org/security/advisories/mfsa2025-07/

Vendor Advisory

https://www.mozilla.org/security/advisories/mfsa2025-11/

Scores

CVSS v3 4.3

EPSS 0.0034

EPSS Percentile 25.3%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N

CISA SSVC

Vulnrichment

Exploitation none

Automatable no

Technical Impact partial

Details

CWE

CWE-1021

Status published

Products (4)

mozilla/firefox < 135.0

Mozilla/Firefox 135

mozilla/thunderbird 131.0 - 135.0

Mozilla/Thunderbird 135

Published Feb 04, 2025

Tracked Since Feb 18, 2026