Window spoofing via lost fullscreen state tracking
Published Dec 22, 2022 · Updated Apr 16, 2025
UI spoofing in Firefox for Windows before 96, Firefox ESR before 91.5, and Thunderbird before 91.5 lets remote attackers lock a popup fullscreen. After a popup invokes requestFullscreen and resizeBy or resizeTo, the Windows widget loses fullscreen-state tracking, so the Escape-key exit path returns early. A victim must interact with attacker-controlled web content; the popup remains fullscreen when Escape is pressed, enabling window spoofing, although switching or closing windows still exits.
Summary
What happened
UI spoofing in Firefox for Windows before 96, Firefox ESR before 91.5, and Thunderbird before 91.5 lets remote attackers lock a popup fullscreen. After a popup invokes requestFullscreen and resizeBy or resizeTo, the Windows widget loses fullscreen-state tracking, so the Escape-key exit path returns early. A victim must interact with attacker-controlled web content; the popup remains fullscreen when Escape is pressed, enabling window spoofing, although switching or closing windows still exits.
The record
- CVE
- CVE-2022-22741
- Published
- Dec 22, 2022
- Updated
- Apr 16, 2025
- Vendor
- Mozilla
- Product
- Firefox
- Classifications
- CWE-1021, T1598.003
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Dec 22, 2022CVE publishedPublication date reported by the CVE source.
- Apr 16, 2025Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=unspecified <96
What conditions does exploitation require?
What is affected?
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- Mozilla fullscreen popup testcaseproof of concept · validated
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Technologies
Your stack
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Your stack
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