# Mozilla Firefox 154.0

Mozilla Firefox 154.0, released August 12, 2026, fixes 16 CVEs in Mozilla Firefox. None of them is reported as exploited. Patch Radar priority: Urgent. The latest Mozilla Firefox is 159.0.1, which also fixes every one of these CVEs.

- Web page: https://patchblox.com/security/fix/macos/org.mozilla.firefox-154.0
- Platform: macOS
- Released: Aug 12, 2026
- Priority: Urgent (Closes CVE-2026-74989, rated Critical)
- CVEs: 16, exploited: 0, on CISA KEV: 0
- Superseded by: [Mozilla Firefox 159.0.1](https://patchblox.com/security/data/product/macos/mozilla-firefox.md), the latest version, which also fixes every CVE listed here

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [Mozilla Firefox](https://patchblox.com/security/data/product/macos/mozilla-firefox.md) |  | 154.0 |

## CVEs this fix closes

| CVE | Priority | Title | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2026-74989](https://patchblox.com/security/data/cve/CVE-2026-74989.md) | Urgent | Internally found bugs fixed in Thunderbird 154 | 9.8 | 0.0057 |  |
| [CVE-2026-74956](https://patchblox.com/security/data/cve/CVE-2026-74956.md) | Urgent | Same-origin policy bypass in the DOM: Service Workers component | 9.1 | 0.0050 |  |
| [CVE-2026-75874](https://patchblox.com/security/data/cve/CVE-2026-75874.md) | Urgent | Sandbox escape in the Remote Settings Client component | 10.0 | 0.0046 |  |
| [CVE-2026-74940](https://patchblox.com/security/data/cve/CVE-2026-74940.md) | Urgent | Use-after-free in the Graphics: Text component | 9.8 | 0.0041 |  |
| [CVE-2026-74979](https://patchblox.com/security/data/cve/CVE-2026-74979.md) | Urgent | Mitigation bypass in the Add-ons Manager component | 9.8 | 0.0031 |  |
| [CVE-2026-74958](https://patchblox.com/security/data/cve/CVE-2026-74958.md) | High | Information disclosure in the WebRTC component | 7.5 | 0.0045 |  |
| [CVE-2026-74947](https://patchblox.com/security/data/cve/CVE-2026-74947.md) | High | Privilege escalation due to invalid pointer in the Graphics component | 8.8 | 0.0045 |  |
| [CVE-2026-74938](https://patchblox.com/security/data/cve/CVE-2026-74938.md) | High | Mitigation bypass in the JavaScript: GC component | 9.1 | 0.0044 |  |
| [CVE-2026-74954](https://patchblox.com/security/data/cve/CVE-2026-74954.md) | High | Information disclosure due to side-channel in the Storage: Cache API component | 7.5 | 0.0044 |  |
| [CVE-2026-74937](https://patchblox.com/security/data/cve/CVE-2026-74937.md) | High | Use-after-free in the JavaScript: GC component | 8.8 | 0.0044 |  |
| [CVE-2026-74950](https://patchblox.com/security/data/cve/CVE-2026-74950.md) | High | Privilege escalation in the Downloads API component | 8.8 | 0.0042 |  |
| [CVE-2026-74952](https://patchblox.com/security/data/cve/CVE-2026-74952.md) | High | Privilege escalation in the Application Update component | 8.8 | 0.0042 |  |
| [CVE-2026-74955](https://patchblox.com/security/data/cve/CVE-2026-74955.md) | High | Privilege escalation in the Request Handling component | 8.8 | 0.0042 |  |
| [CVE-2026-74965](https://patchblox.com/security/data/cve/CVE-2026-74965.md) | High | Privilege escalation in the Shell Integration component | 8.8 | 0.0030 |  |
| [CVE-2026-74963](https://patchblox.com/security/data/cve/CVE-2026-74963.md) | High | Same-origin policy bypass in the Networking: Cookies component | 7.5 | 0.0012 |  |
| [CVE-2026-74968](https://patchblox.com/security/data/cve/CVE-2026-74968.md) | Routine | Site isolation issue in the Graphics: WebRender component | 5.4 | 0.0016 |  |

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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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