Mozilla Firefox ESR (pl) 153.4.0
Mozilla Firefox ESR (pl) 153.4.0, released September 29, 2026, fixes 59 CVEs in Mozilla Firefox ESR (pl). None of them is reported as exploited. Patch Radar priority: Urgent. The latest Mozilla Firefox ESR (pl) is 153.7.0, which also fixes every one of these CVEs.
Superseded. The latest Mozilla Firefox ESR (pl) is 153.7.0, which also fixes every CVE on this page. Install that instead.
Priority of the 59 CVEs
Applies to
| Product | Version |
|---|---|
| Mozilla Firefox ESR (pl) | 153.4.0 |
CVEs this fix closes
| Priority | CVE | Title | CVSS | EPSS | Exploitation |
|---|---|---|---|---|---|
| Urgent | CVE-2026-100760 | Sandbox escape in the Security: Process Sandboxing component | 9.6 | 0.0030 | None reported |
| Urgent | CVE-2026-100787 | Sandbox escape in the XUL component | 9.6 | 0.0030 | None reported |
| Urgent | CVE-2026-100800 | Sandbox escape due to use-after-free in the Disability Access APIs component | 9.6 | 0.0029 | None reported |
| Urgent | CVE-2026-100828 | Mitigation bypass in the Bookmarks & History component | 9.6 | 0.0024 | None reported |
| Urgent | CVE-2026-100829 | Mitigation bypass in the DOM: Security component | 9.6 | 0.0024 | None reported |
| High | CVE-2026-100788 | Invalid pointer in the JavaScript: WebAssembly component | 9.8 | 0.0042 | None reported |
| High | CVE-2026-100773 | Use-after-free in the Storage: IndexedDB component | 8.8 | 0.0040 | None reported |
| High | CVE-2026-100791 | Use-after-free in the DOM: Core & HTML component | 8.8 | 0.0040 | None reported |
| High | CVE-2026-100783 | Uninitialized memory in the Audio/Video component | 7.5 | 0.0035 | None reported |
| High | CVE-2026-100775 | Sandbox escape in the Graphics component | 9.6 | 0.0033 | None reported |
| High | CVE-2026-100767 | Use-after-free in the Networking: Cache component | 8.8 | 0.0033 | None reported |
| High | CVE-2026-100784 | Use-after-free in the Layout: Text and Fonts component | 8.8 | 0.0033 | None reported |
| High | CVE-2026-100794 | Sandbox escape due to incorrect boundary conditions in the Internationalization component | 9.6 | 0.0032 | None reported |
| High | CVE-2026-100762 | Sandbox escape due to use-after-free in the DOM: Content Processes component | 9.6 | 0.0032 | None reported |
| High | CVE-2026-100770 | Sandbox escape due to use-after-free in the DOM: Content Processes component | 9.6 | 0.0032 | None reported |
| High | CVE-2026-100778 | Sandbox escape due to use-after-free in the DOM: Core & HTML component | 9.6 | 0.0032 | None reported |
| High | CVE-2026-100786 | Sandbox escape due to use-after-free in the Graphics component | 9.6 | 0.0032 | None reported |
| High | CVE-2026-100757 | Use-after-free in the Widget component | 8.8 | 0.0032 | None reported |
| High | CVE-2026-100774 | Use-after-free in the DOM: Core & HTML component | 8.8 | 0.0032 | None reported |
| High | CVE-2026-100777 | Use-after-free in the Graphics: Canvas2D component | 8.8 | 0.0032 | None reported |
| High | CVE-2026-100785 | Use-after-free in the DOM: Core & HTML component | 8.8 | 0.0032 | None reported |
| High | CVE-2026-100789 | Use-after-free in the Graphics: Canvas2D component | 8.8 | 0.0032 | None reported |
| High | CVE-2026-100790 | Use-after-free in the XSLT component | 8.8 | 0.0032 | None reported |
| High | CVE-2026-100769 | Use-after-free in the JavaScript: WebAssembly component | 8.8 | 0.0032 | None reported |
| High | CVE-2026-100772 | Use-after-free in the DOM: Core & HTML component | 8.8 | 0.0031 | None reported |
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