# Mozilla Firefox (en-US) 109.0

Mozilla Firefox (en-US) 109.0, released January 17, 2023, fixes 9 CVEs in Mozilla Firefox (en-US). None of them is reported as exploited. Patch Radar priority: High. The latest Mozilla Firefox (en-US) is 159.0, which also fixes every one of these CVEs.

- Web page: https://patchblox.com/security/fix/windows-app/mozilla.firefox-109.0
- Platform: Windows apps
- Released: Jan 17, 2023
- Priority: High (Closes CVE-2023-23605, high severity)
- CVEs: 9, exploited: 0, on CISA KEV: 0
- Superseded by: [Mozilla Firefox (en-US) 159.0](https://patchblox.com/security/data/product/windows-app/mozilla-firefox-en-us.md), the latest version, which also fixes every CVE listed here

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [Mozilla Firefox (en-US)](https://patchblox.com/security/data/product/windows-app/mozilla-firefox-en-us.md) |  | 109.0 |

## CVEs this fix closes

| CVE | Priority | Title | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2023-23605](https://patchblox.com/security/data/cve/CVE-2023-23605.md) | High | Memory safety bugs fixed in Firefox 109 and Firefox ESR 102.7 | 8.8 | 0.0070 |  |
| [CVE-2023-23598](https://patchblox.com/security/data/cve/CVE-2023-23598.md) | High | Arbitrary file read from GTK drag and drop on Linux | 8.8 | 0.0064 |  |
| [CVE-2023-23603](https://patchblox.com/security/data/cve/CVE-2023-23603.md) | High | Calls to console.log allowed bypassing Content Security Policy via format directive | 8.8 | 0.0064 |  |
| [CVE-2023-23599](https://patchblox.com/security/data/cve/CVE-2023-23599.md) | High | Malicious command could be hidden in devtools output on Windows | 8.8 | 0.0060 |  |
| [CVE-2023-23602](https://patchblox.com/security/data/cve/CVE-2023-23602.md) | High | Content Security Policy wasn't being correctly applied to WebSockets in WebWorkers | 8.8 | 0.0060 |  |
| [CVE-2023-23606](https://patchblox.com/security/data/cve/CVE-2023-23606.md) | High | Memory safety bugs fixed in Firefox 109 | 8.8 | 0.0052 |  |
| [CVE-2023-23601](https://patchblox.com/security/data/cve/CVE-2023-23601.md) | High | URL being dragged from cross-origin iframe into same tab triggers navigation | 8.8 | 0.0035 |  |
| [CVE-2023-23604](https://patchblox.com/security/data/cve/CVE-2023-23604.md) | Routine | Creation of duplicate SystemPrincipal from less secure contexts | 6.5 | 0.0046 |  |
| [CVE-2023-23597](https://patchblox.com/security/data/cve/CVE-2023-23597.md) | Routine | Logic bug in process allocation allowed to read arbitrary files | 6.5 | 0.0034 |  |

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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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