# Firefox Developer Edition (en-US) 131.0

Firefox Developer Edition (en-US) 131.0, released September 3, 2024, fixes 13 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-131.0
- Platform: Windows apps
- Released: Sep 3, 2024
- Priority: High (Closes CVE-2024-9401, high severity)
- CVEs: 13, 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- Superseded by: [Firefox Developer Edition (en-US) 156.0](https://patchblox.com/security/data/product/windows-app/firefox-developer-edition-en-us.md), the latest version,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) |  | 131.0 |

## CVEs this fix closes

| CVE | Priority | Title | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2024-9401](https://patchblox.com/security/data/cve/CVE-2024-9401.md) | High | Mozilla Firefox ESR and 7 others: Improper Restriction of Operations within the Bounds of a Memory Buffer | 9.8 | 0.0074 |  |
| [CVE-2024-9402](https://patchblox.com/security/data/cve/CVE-2024-9402.md) | High | Mozilla Firefox ESR and 7 others: Improper Restriction of Operations within the Bounds of a Memory Buffer | 9.8 | 0.0062 |  |
| [CVE-2024-9396](https://patchblox.com/security/data/cve/CVE-2024-9396.md) | High | Mozilla Firefox ESR and 7 others: Improper Restriction of Operations within the Bounds of a Memory Buffer | 8.8 | 0.0059 |  |
| [CVE-2024-9392](https://patchblox.com/security/data/cve/CVE-2024-9392.md) | High | Mozilla Firefox ESR and 7 others: Origin Validation Error | 9.8 | 0.0054 |  |
| [CVE-2024-9394](https://patchblox.com/security/data/cve/CVE-2024-9394.md) | High | Mozilla Firefox ESR and 7 others: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') | 7.6 | 0.0052 |  |
| [CVE-2024-9400](https://patchblox.com/security/data/cve/CVE-2024-9400.md) | High | Mozilla Firefox ESR and 7 others: Improper Restriction of Operations within the Bounds of a Memory Buffer | 8.8 | 0.0051 |  |
| [CVE-2024-9399](https://patchblox.com/security/data/cve/CVE-2024-9399.md) | High | Mozilla Firefox ESR and 7 others: Improper Resource Shutdown or Release | 7.5 | 0.0050 |  |
| [CVE-2024-9403](https://patchblox.com/security/data/cve/CVE-2024-9403.md) | High | Mozilla Firefox ESR and 7 others: Improper Restriction of Operations within the Bounds of a Memory Buffer | 7.5 | 0.0045 |  |
| [CVE-2024-9393](https://patchblox.com/security/data/cve/CVE-2024-9393.md) | High | Mozilla Firefox ESR and 7 others: Origin Validation Error | 7.6 | 0.0040 |  |
| [CVE-2024-9398](https://patchblox.com/security/data/cve/CVE-2024-9398.md) | Routine | Mozilla Firefox ESR and 7 others: Observable Discrepancy | 5.3 | 0.0057 |  |
| [CVE-2024-9397](https://patchblox.com/security/data/cve/CVE-2024-9397.md) | Routine | Mozilla Firefox ESR and 7 others: Improper Restriction of Rendered UI Layers or Frames | 6.1 | 0.0037 |  |
| [CVE-2024-9395](https://patchblox.com/security/data/cve/CVE-2024-9395.md) | Routine | Mozilla Firefox ESR and 4 others: A specially crafted filename containing a large number of spaces could obscure the file's extension when… | 5.3 | 0.0033 |  |
| [CVE-2024-9391](https://patchblox.com/security/data/cve/CVE-2024-9391.md) | Routine | Mozilla Firefox ESR and 4 others: Authentication Bypass by Spoofing | 6.5 | 0.0028 |  |

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Data as of 2026-11-08T00:53:09Z 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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