# Firefox Developer Edition (en-US) 126.0

Firefox Developer Edition (en-US) 126.0, released April 16, 2024, fixes 17 CVEs in Firefox Developer Edition (en-US). None of them is reported as exploited. Patch Radar priority: High. The latest Firefox Developer Edition (en-US) is 156.0, which also fixes every one of these CVEs.

- Web page: https://patchblox.com/security/fix/windows-app/mozilla.firefox.developeredition-126.0
- Platform: Windows apps
- Released: Apr 16, 2024
- Priority: High (Closes CVE-2024-4367, high severity)
- CVEs: 17, exploited: 0, on CISA KEV: 0
- Superseded by: [Firefox Developer Edition (en-US) 156.0](https://patchblox.com/security/data/product/windows-app/firefox-developer-edition-en-us.md), the latest version, which also fixes every CVE listed here

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [Firefox Developer Edition (en-US)](https://patchblox.com/security/data/product/windows-app/firefox-developer-edition-en-us.md) |  | 126.0 |

## CVEs this fix closes

| CVE | Priority | Title | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2024-4367](https://patchblox.com/security/data/cve/CVE-2024-4367.md) | High | Mozilla Firefox ESR and 6 others: Improper Check for Unusual or Exceptional Conditions | 8.8 | 0.7066 |  |
| [CVE-2024-4770](https://patchblox.com/security/data/cve/CVE-2024-4770.md) | High | Mozilla Firefox ESR and 6 others: Use After Free | 8.8 | 0.0059 |  |
| [CVE-2024-4764](https://patchblox.com/security/data/cve/CVE-2024-4764.md) | High | Mozilla Firefox ESR and 4 others: Use After Free | 9.8 | 0.0057 |  |
| [CVE-2024-4773](https://patchblox.com/security/data/cve/CVE-2024-4773.md) | High | Mozilla Firefox ESR and 4 others: URL Redirection to Untrusted Site ('Open Redirect') | 7.5 | 0.0054 |  |
| [CVE-2024-6604](https://patchblox.com/security/data/cve/CVE-2024-6604.md) | High | Memory safety bugs fixed in Firefox 128, Firefox ESR 115.13, Thunderbird 128, and Thunderbird 115.13 | 7.5 | 0.0054 |  |
| [CVE-2024-4777](https://patchblox.com/security/data/cve/CVE-2024-4777.md) | High | Mozilla Firefox ESR and 6 others: Use After Free | 8.8 | 0.0054 |  |
| [CVE-2024-4771](https://patchblox.com/security/data/cve/CVE-2024-4771.md) | High | Mozilla Firefox ESR and 4 others: Use After Free | 8.6 | 0.0052 |  |
| [CVE-2024-4778](https://patchblox.com/security/data/cve/CVE-2024-4778.md) | High | Mozilla Firefox ESR and 4 others: Improper Handling of Overlap Between Protected Memory Ranges | 9.8 | 0.0044 |  |
| [CVE-2024-4776](https://patchblox.com/security/data/cve/CVE-2024-4776.md) | High | Mozilla Firefox ESR and 4 others: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') | 8.2 | 0.0042 |  |
| [CVE-2024-4765](https://patchblox.com/security/data/cve/CVE-2024-4765.md) | High | Mozilla Firefox ESR and 4 others: Use of a Broken or Risky Cryptographic Algorithm | 8.1 | 0.0027 |  |
| [CVE-2024-4768](https://patchblox.com/security/data/cve/CVE-2024-4768.md) | Routine | Mozilla Firefox ESR and 6 others: Improper Preservation of Permissions | 6.1 | 0.0054 |  |
| [CVE-2024-4767](https://patchblox.com/security/data/cve/CVE-2024-4767.md) | Routine | Mozilla Firefox ESR and 6 others: Exposure of Private Personal Information to an Unauthorized Actor | 6.1 | 0.0049 |  |
| [CVE-2024-10941](https://patchblox.com/security/data/cve/CVE-2024-10941.md) | Routine | Mozilla Firefox ESR and 4 others: Improper Neutralization of Invalid Characters in Identifiers in Web Pages | 6.5 | 0.0043 |  |
| [CVE-2024-4774](https://patchblox.com/security/data/cve/CVE-2024-4774.md) | Routine | Mozilla Firefox ESR and 4 others: Reliance on Undefined, Unspecified, or Implementation-Defined Behavior | 6.5 | 0.0037 |  |
| [CVE-2024-4769](https://patchblox.com/security/data/cve/CVE-2024-4769.md) | Routine | Mozilla Firefox ESR and 6 others: Insufficient Type Distinction | 6.1 | 0.0037 |  |
| [CVE-2024-4775](https://patchblox.com/security/data/cve/CVE-2024-4775.md) | Routine | Mozilla Firefox ESR and 4 others: Missing Handler | 5.9 | 0.0022 |  |
| [CVE-2024-4772](https://patchblox.com/security/data/cve/CVE-2024-4772.md) | Routine | Mozilla Firefox ESR and 4 others: Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG) | 5.9 | 0.0022 |  |

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Data as of 2026-11-08T13:06:02Z 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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