# CVE-2023-37204: Mozilla Firefox and 2 others: A website could have obscured the fullscreen notification by using an option element by introducing lag…

CVE-2023-37204 is fixed in 5 products on 2 platforms, first by Mozilla Firefox (en-US) 115.0, released July 4, 2023. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2023-37204
- Priority: Routine
- CVSS: 6.5 (Medium)
- EPSS: 0.0052
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jul 5, 2023
- Vendor advisory: https://nvd.nist.gov/vuln/detail/CVE-2023-37204

## Description

A website could have obscured the fullscreen notification by using an option element by introducing lag via an expensive computational function. This could have led to user confusion and possible spoofing attacks. This vulnerability affects Firefox < 115.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Windows apps | Mozilla Firefox (en-US) | 115.0 | [Mozilla Firefox (en-US) 115.0](https://patchblox.com/security/data/fix/windows-app/mozilla.firefox-115.0.md) | Jul 4, 2023 |
| Windows apps | Mozilla Firefox ESR (en-US) | 115.4.0 | [Mozilla Firefox ESR (en-US) 115.4.0](https://patchblox.com/security/data/fix/windows-app/mozilla.firefox.esr-115.4.0.md) | Oct 17, 2023 |
| Linux | firefox Ubuntu 20.04 LTS (focal) | 115.0+build2-0ubuntu0.20.04.3 | [firefox 115.0+build2-0ubuntu0.20.04.3](https://patchblox.com/security/data/fix/linux/ubuntu-focal-firefox-115.0-build2-0ubuntu0.20.04.3.md) | Jul 5, 2023 |
| Linux | firefox-geckodriver Ubuntu 20.04 LTS (focal) | 115.0+build2-0ubuntu0.20.04.3 | [firefox-geckodriver 115.0+build2-0ubuntu0.20.04.3](https://patchblox.com/security/data/fix/linux/ubuntu-focal-firefox-geckodriver-115.0-build2-0ubuntu0.20.04.3.md) | Jul 5, 2023 |
| Linux | firefox-mozsymbols Ubuntu 20.04 LTS (focal) | 115.0+build2-0ubuntu0.20.04.3 | [firefox-mozsymbols 115.0+build2-0ubuntu0.20.04.3](https://patchblox.com/security/data/fix/linux/ubuntu-focal-firefox-mozsymbols-115.0-build2-0ubuntu0.20.04.3.md) | Jul 5, 2023 |

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Data as of 2026-11-08T13:06:02Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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