# CVE-2022-22746: Mozilla Firefox ESR and 3 others: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

CVE-2022-22746 is fixed in 2 products on 1 platform, first by Mozilla Thunderbird (en-US) 91.5.0, released January 6, 2022. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2022-22746
- Priority: Routine
- CVSS: 5.9
- EPSS: 0.0062
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Dec 22, 2022
- Weakness: CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
- Vendor advisory: https://nvd.nist.gov/vuln/detail/CVE-2022-22746

## Description

A race condition could have allowed bypassing the fullscreen notification which could have lead to a fullscreen window spoof being unnoticed.<br>*This bug only affects Firefox for Windows. Other operating systems are unaffected.*. This vulnerability affects Firefox ESR < 91.5, Firefox < 96, and Thunderbird < 91.5.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Windows apps | Mozilla Firefox ESR (en-US) | 102.0 | [Mozilla Firefox ESR (en-US) 102.0](https://patchblox.com/security/data/fix/windows-app/mozilla.firefox.esr-102.0.md) | Jun 23, 2022 |
| Windows apps | Mozilla Thunderbird (en-US) | 91.5.0 | [Mozilla Thunderbird (en-US) 91.5.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird-91.5.0.md) | Jan 6, 2022 |

---

Data as of 2026-11-08T06:59:42Z 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

Free to use with attribution: show "Data: Patchblox Patch Radar" with a link to https://patchblox.com/security/patch-radar. Terms, including what needs a written agreement: https://patchblox.com/security/patch-radar/use-the-data

Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.