Mozilla Firefox (th) 150.0.3
Mozilla Firefox (th) 150.0.3, released May 12, 2026, fixes 5 CVEs in Mozilla Firefox (th). None of them is reported as exploited. Patch Radar priority: High. The latest Mozilla Firefox (th) is 159.0, which also fixes every one of these CVEs.
Superseded. The latest Mozilla Firefox (th) is 159.0, which also fixes every CVE on this page. Install that instead.
Priority of the 5 CVEs
Applies to
| Product | Version |
|---|---|
| Mozilla Firefox (th) | 150.0.3 |
CVEs this fix closes
| Priority | CVE | Title | CVSS | EPSS | Exploitation |
|---|---|---|---|---|---|
| High | CVE-2026-8390 | Use-after-free in the JavaScript: WebAssembly component | 7.3 | 0.0050 | None reported |
| High | CVE-2026-8389 | JIT miscompilation in the JavaScript Engine: JIT component | 8.8 | 0.0042 | None reported |
| High | CVE-2026-8401 | Sandbox escape in the Profile Backup component | 9.8 | 0.0031 | None reported |
| High | CVE-2026-8391 | Other issue in the JavaScript Engine component | 7.5 | 0.0030 | None reported |
| High | CVE-2026-8388 | Incorrect boundary conditions in the JavaScript Engine: JIT component | 7.5 | 0.0024 | None reported |
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