# CVE-2023-28163: Mozilla Firefox and 4 others: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

CVE-2023-28163 is fixed in 3 products on 1 platform, first by Mozilla Firefox (en-US) 111.0, released March 16, 2023. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2023-28163
- Priority: Routine
- CVSS: 6.5
- EPSS: 0.0080
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jun 2, 2023
- Weakness: CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
- Vendor advisory: https://nvd.nist.gov/vuln/detail/CVE-2023-28163

## Description

When downloading files through the Save As dialog on Windows with suggested filenames containing environment variable names, Windows would have resolved those in the context of the current user. <br>*This bug only affects Firefox on Windows. Other versions of Firefox are unaffected.*. This vulnerability affects Firefox < 111, Firefox ESR < 102.9, and Thunderbird < 102.9.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Windows apps | Mozilla Firefox (en-US) | 111.0 | [Mozilla Firefox (en-US) 111.0](https://patchblox.com/security/data/fix/windows-app/mozilla.firefox-111.0.md) | Mar 16, 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 |
| Windows apps | Mozilla Thunderbird (en-US) | 115.8.0 | [Mozilla Thunderbird (en-US) 115.8.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird-115.8.0.md) | Feb 21, 2024 |

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Data as of 2026-11-09T07:25:28Z 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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