# CVE-2022-31739: Mozilla Thunderbird and 4 others: External Control of File Name or Path

CVE-2022-31739 is fixed in 3 products on 1 platform, first by Mozilla Firefox (en-US) 101.0, released May 31, 2022. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2022-31739
- Priority: High
- CVSS: 8.8
- EPSS: 0.0071
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Dec 22, 2022
- Weakness: CWE-73: External Control of File Name or Path
- Vendor advisory: https://nvd.nist.gov/vuln/detail/CVE-2022-31739

## Description

When downloading files on Windows, the % character was not escaped, which could have lead to a download incorrectly being saved to attacker-influenced paths that used variables such as %HOMEPATH% or %APPDATA%.<br>*This bug only affects Firefox for Windows. Other operating systems are unaffected.*. This vulnerability affects Thunderbird < 91.10, Firefox < 101, and Firefox ESR < 91.10.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Windows apps | Mozilla Firefox (en-US) | 101.0 | [Mozilla Firefox (en-US) 101.0](https://patchblox.com/security/data/fix/windows-app/mozilla.firefox-101.0.md) | May 31, 2022 |
| 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) | 102.0 | [Mozilla Thunderbird (en-US) 102.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird-102.0.md) | Jun 29, 2022 |

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Data as of 2026-11-08T19:12:23Z 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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