# Mozilla Firefox ESR (ar) 153.2.0

Mozilla Firefox ESR (ar) 153.2.0, released September 1, 2026, fixes 22 CVEs in Mozilla Firefox ESR (ar). None of them is reported as exploited. Patch Radar priority: Urgent. The latest Mozilla Firefox ESR (ar) is 153.7.0, which also fixes every one of these CVEs.

- Web page: https://patchblox.com/security/fix/windows-app/mozilla.firefox.esr.ar-153.2.0
- Platform: Windows apps
- Released: Sep 1, 2026
- Priority: Urgent (Closes CVE-2026-84134, rated Critical)
- CVEs: 22, exploited: 0, on CISA KEV: 0
- Superseded by: [Mozilla Firefox ESR (ar) 153.7.0](https://patchblox.com/security/data/product/windows-app/mozilla-firefox-esr-ar.md), the latest version, which also fixes every CVE listed here

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [Mozilla Firefox ESR (ar)](https://patchblox.com/security/data/product/windows-app/mozilla-firefox-esr-ar.md) |  | 153.2.0 |

## CVEs this fix closes

| CVE | Priority | Title | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2026-84134](https://patchblox.com/security/data/cve/CVE-2026-84134.md) | Urgent | Other issue in the Profile Backup component | 9.8 | 0.0057 |  |
| [CVE-2026-84130](https://patchblox.com/security/data/cve/CVE-2026-84130.md) | High | Information disclosure in the Graphics: WebGPU component | 7.5 | 0.0044 |  |
| [CVE-2026-84123](https://patchblox.com/security/data/cve/CVE-2026-84123.md) | High | Privilege escalation due to use-after-free in the Graphics: WebGPU component | 8.8 | 0.0044 |  |
| [CVE-2026-84144](https://patchblox.com/security/data/cve/CVE-2026-84144.md) | High | Internally found bugs fixed in Thunderbird 155 and Thunderbird ESR 153.2 | 7.5 | 0.0043 |  |
| [CVE-2026-84143](https://patchblox.com/security/data/cve/CVE-2026-84143.md) | High | Internally found bugs fixed in Thunderbird 155, Thunderbird ESR 153.2 and Thunderbird ESR 140.15 | 9.8 | 0.0038 |  |
| [CVE-2026-84145](https://patchblox.com/security/data/cve/CVE-2026-84145.md) | High | Internally found bugs fixed in Thunderbird 155, Thunderbird ESR 153.2 and Thunderbird ESR 140.15 | 7.5 | 0.0037 |  |
| [CVE-2026-84141](https://patchblox.com/security/data/cve/CVE-2026-84141.md) | High | Integer overflow in the Graphics: ImageLib component | 9.8 | 0.0034 |  |
| [CVE-2026-84131](https://patchblox.com/security/data/cve/CVE-2026-84131.md) | High | Privilege escalation due to invalid pointer in the Graphics component | 8.8 | 0.0033 |  |
| [CVE-2026-84119](https://patchblox.com/security/data/cve/CVE-2026-84119.md) | High | Sandbox escape due to use-after-free in the DOM: Navigation component | 9.6 | 0.0032 |  |
| [CVE-2026-84121](https://patchblox.com/security/data/cve/CVE-2026-84121.md) | High | Sandbox escape due to use-after-free in the DOM: Security component | 9.6 | 0.0032 |  |
| [CVE-2026-84132](https://patchblox.com/security/data/cve/CVE-2026-84132.md) | High | Information disclosure in the Networking: HTTP component | 7.5 | 0.0026 |  |
| [CVE-2026-84120](https://patchblox.com/security/data/cve/CVE-2026-84120.md) | High | Use-after-free in the Audio/Video component | 7.5 | 0.0022 |  |
| [CVE-2026-84122](https://patchblox.com/security/data/cve/CVE-2026-84122.md) | High | Use-after-free in the Audio/Video component | 7.5 | 0.0021 |  |
| [CVE-2026-84129](https://patchblox.com/security/data/cve/CVE-2026-84129.md) | High | Site isolation issue in the DOM: Navigation component | 9.8 | 0.0019 |  |
| [CVE-2026-84133](https://patchblox.com/security/data/cve/CVE-2026-84133.md) | High | Site isolation issue in the DOM: Push Subscriptions component | 9.8 | 0.0019 |  |
| [CVE-2026-84140](https://patchblox.com/security/data/cve/CVE-2026-84140.md) | High | Site isolation issue in the DOM: Navigation component | 9.8 | 0.0018 |  |
| [CVE-2026-84124](https://patchblox.com/security/data/cve/CVE-2026-84124.md) | High | Use-after-free in the DOM: Core & HTML component | 8.8 | 0.0017 |  |
| [CVE-2026-84139](https://patchblox.com/security/data/cve/CVE-2026-84139.md) | Routine | Clickjacking issue in the DOM: Events component | 6.1 | 0.0034 |  |
| [CVE-2026-84118](https://patchblox.com/security/data/cve/CVE-2026-84118.md) | Routine | Use-after-free in the JavaScript: GC component | 5.4 | 0.0029 |  |
| [CVE-2026-84125](https://patchblox.com/security/data/cve/CVE-2026-84125.md) | Routine | Use-after-free in the DOM: Core & HTML component | 5.4 | 0.0029 |  |
| [CVE-2026-84136](https://patchblox.com/security/data/cve/CVE-2026-84136.md) | Routine | Other issue in the DOM: Navigation component | 6.1 | 0.0020 |  |
| [CVE-2026-84137](https://patchblox.com/security/data/cve/CVE-2026-84137.md) | Routine | Spoofing issue in the DOM: Core & HTML component | 4.3 | 0.0013 |  |

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Data as of 2026-11-11T13:47:35Z 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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