# Mozilla Firefox (en-US) 116.0

Mozilla Firefox (en-US) 116.0, released August 2, 2023, fixes 15 CVEs in Mozilla Firefox (en-US). None of them is reported as exploited. Patch Radar priority: Urgent. 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-116.0
- Platform: Windows apps
- Released: Aug 2, 2023
- Priority: Urgent (Closes CVE-2023-4056, rated Critical)
- CVEs: 15, 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- Superseded by: [Mozilla Firefox (en-US) 159.0](https://patchblox.com/security/data/product/windows-app/mozilla-firefox-en-us.md), the latest version, which also fixes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) |  | 116.0 |

## CVEs this fix closes

| CVE | Priority | Title | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2023-4056](https://patchblox.com/security/data/cve/CVE-2023-4056.md) | Urgent | Mozilla Firefox ESR and 3 others: Memory safety bugs present in Firefox 115, Firefox ESR 115.0, Firefox ESR 102.13, Thunderbird 115.0,… | 9.8 | 0.0095 |  |
| [CVE-2023-4057](https://patchblox.com/security/data/cve/CVE-2023-4057.md) | Urgent | Mozilla Firefox ESR and 5 others: Memory safety bugs present in Firefox 115, Firefox ESR 115.0, and Thunderbird 115.0. | 9.8 | 0.0089 |  |
| [CVE-2023-4058](https://patchblox.com/security/data/cve/CVE-2023-4058.md) | Urgent | Mozilla Firefox ESR and 3 others: Memory safety bugs present in Firefox 115. | 9.8 | 0.0079 |  |
| [CVE-2023-4050](https://patchblox.com/security/data/cve/CVE-2023-4050.md) | High | Mozilla Firefox ESR and 3 others: In some cases, an untrusted input stream was copied to a stack buffer without checking its size. | 7.5 | 0.1258 |  |
| [CVE-2023-4046](https://patchblox.com/security/data/cve/CVE-2023-4046.md) | High | Mozilla Firefox ESR and 3 others: Allocation of Resources Without Limits or Throttling | 7.5 | 0.0113 |  |
| [CVE-2023-4048](https://patchblox.com/security/data/cve/CVE-2023-4048.md) | High | Mozilla Firefox ESR and 3 others: An out-of-bounds read could have led to an exploitable crash when parsing HTML with DOMParser in low… | 7.5 | 0.0093 |  |
| [CVE-2023-4053](https://patchblox.com/security/data/cve/CVE-2023-4053.md) | High | Full screen notification obscured by external program | 8.8 | 0.0077 |  |
| [CVE-2023-4055](https://patchblox.com/security/data/cve/CVE-2023-4055.md) | High | Mozilla Firefox ESR and 3 others: Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') | 7.5 | 0.0073 |  |
| [CVE-2024-2616](https://patchblox.com/security/data/cve/CVE-2024-2616.md) | High | Mozilla Firefox ESR and 5 others: To harden ICU against exploitation, the behavior for out-of-memory conditions was changed to crash instead… | 7.5 | 0.0070 |  |
| [CVE-2023-4051](https://patchblox.com/security/data/cve/CVE-2023-4051.md) | High | Full screen notification obscured by file open dialog | 8.8 | 0.0066 |  |
| [CVE-2023-4049](https://patchblox.com/security/data/cve/CVE-2023-4049.md) | High | Mozilla Firefox ESR and 3 others: Race conditions in reference counting code were found through code inspection. | 7.5 | 0.0063 |  |
| [CVE-2023-4047](https://patchblox.com/security/data/cve/CVE-2023-4047.md) | High | Mozilla Firefox ESR and 3 others: Cross-Site Request Forgery (CSRF) | 8.8 | 0.0063 |  |
| [CVE-2023-4045](https://patchblox.com/security/data/cve/CVE-2023-4045.md) | High | Mozilla Firefox ESR and 3 others: Offscreen Canvas did not properly track cross-origin tainting, which could have been used to access image… | 7.5 | 0.0059 |  |
| [CVE-2023-4052](https://patchblox.com/security/data/cve/CVE-2023-4052.md) | Routine | Mozilla Firefox ESR and 5 others: The Firefox updater created a directory writable by non-privileged users. | 6.5 | 0.0071 |  |
| [CVE-2023-4054](https://patchblox.com/security/data/cve/CVE-2023-4054.md) | Routine | Mozilla Firefox ESR and 4 others: When opening appref-ms files, Firefox did not warn the user that these files may contain malicious code. | 5.5 | 0.0021 |  |

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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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