UI spoofing via delayed fullscreen notification
Published Jul 5, 2023 · Updated Feb 13, 2025
UI spoofing in Mozilla Firefox before 115 allows remote attackers to obscure the fullscreen notification through a crafted website. An option element is combined with an expensive computational function that delays rendering long enough to cover the browser's fullscreen warning. A user must visit the site and enter fullscreen mode; the concealed warning can make attacker-controlled content appear trustworthy and enable interface spoofing.
Summary
What happened
UI spoofing in Mozilla Firefox before 115 allows remote attackers to obscure the fullscreen notification through a crafted website. An option element is combined with an expensive computational function that delays rendering long enough to cover the browser's fullscreen warning. A user must visit the site and enter fullscreen mode; the concealed warning can make attacker-controlled content appear trustworthy and enable interface spoofing.
The record
- CVE
- CVE-2023-37204
- Published
- Jul 5, 2023
- Updated
- Feb 13, 2025
- Vendor
- Mozilla
- Product
- Firefox
- Classifications
- Unavailable
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jul 5, 2023CVE 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 <115
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
No sourced classifications are available.
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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