UI spoofing via select overlay on fullscreen warning
Published Feb 20, 2024 · Updated Feb 13, 2025
UI spoofing in Mozilla Firefox before 123, Firefox ESR before 115.8, and Thunderbird before 115.8 allows remote attackers to hide fullscreen warnings. The DOM popup layer lets an HTML select options menu remain above the browser fullscreen notification instead of closing when that warning appears. Exploitation requires a user to enter fullscreen and click the crafted select element with suitable timing; the bounded result is visual spoofing and user confusion.
Summary
What happened
UI spoofing in Mozilla Firefox before 123, Firefox ESR before 115.8, and Thunderbird before 115.8 allows remote attackers to hide fullscreen warnings. The DOM popup layer lets an HTML select options menu remain above the browser fullscreen notification instead of closing when that warning appears. Exploitation requires a user to enter fullscreen and click the crafted select element with suitable timing; the bounded result is visual spoofing and user confusion.
The record
- CVE
- CVE-2024-1548
- Published
- Feb 20, 2024
- Updated
- Feb 13, 2025
- Vendor
- Mozilla
- Product
- Firefox
- Classifications
- T1036
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Feb 20, 2024CVE publishedPublication date reported by the CVE source.
- Feb 13, 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 <123
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
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
- Fullscreen select-overlay HTML proof of conceptproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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