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CVE-2026-2800

Spoofing issue in the WebAuthn component in Firefox for Android

Spoofing issue in the WebAuthn component in Firefox for Android. This vulnerability was fixed in Firefox 148 and Thunderbird 148.

CVSS 3.1 · 9.8 Critical EPSS < 1% KEV · Not listed
Vendors
Mozilla
Products
Firefox Thunderbird
CVE-2026-2801

Incorrect boundary conditions in the JavaScript: WebAssembly component

Incorrect boundary conditions in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox 148 and Thunderbird 148.

CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed
Vendors
Mozilla
Products
Firefox Thunderbird
CVE-2026-2802

Race condition in the JavaScript: GC component

Race condition in the JavaScript: GC component. This vulnerability was fixed in Firefox 148 and Thunderbird 148.

CVSS 3.1 · 4.2 Medium EPSS < 1% KEV · Not listed
Vendors
Mozilla
Products
Firefox Thunderbird
CVE-2026-2803

Information disclosure, mitigation bypass in the Settings UI component

Information disclosure, mitigation bypass in the Settings UI component. This vulnerability was fixed in Firefox 148 and Thunderbird 148.

CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed
Vendors
Mozilla
Products
Firefox Thunderbird
CVE-2026-2804

Use-after-free in the JavaScript: WebAssembly component

Use-after-free in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox 148 and Thunderbird 148.

CVSS 3.1 · 5.4 Medium EPSS < 1% KEV · Not listed
Vendors
Mozilla
Products
Firefox Thunderbird
CVE-2026-2805

Invalid pointer in the DOM: Core & HTML component

Invalid pointer in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 148 and Thunderbird 148.

CVSS 3.1 · 9.8 Critical EPSS < 1% KEV · Not listed
Vendors
Mozilla
Products
Firefox Thunderbird
CVE-2026-2806

Uninitialized memory in the Graphics: Text component

Uninitialized memory in the Graphics: Text component. This vulnerability was fixed in Firefox 148 and Thunderbird 148.

CVSS 3.1 · 9.1 Critical EPSS < 1% KEV · Not listed
Vendors
Mozilla
Products
Firefox Thunderbird
CVE-2026-2807

Memory safety bugs fixed in Firefox 148 and Thunderbird 148

Memory safety bugs present in Firefox 147 and Thunderbird 147. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 148 and Thunderbird 148.

CVSS 3.1 · 9.8 Critical EPSS < 1% KEV · Not listed
Vendors
Mozilla
Products
Firefox Thunderbird
CVE-2026-3845

Heap buffer overflow in the Audio/Video: Playback component in Firefox for Android

Heap buffer overflow in the Audio/Video: Playback component in Firefox for Android. This vulnerability was fixed in Firefox 148.0.2.

CVSS 3.1 · 8.8 High EPSS < 1% KEV · Not listed
Vendors
Mozilla
Products
Firefox
CVE-2026-3846

Same-origin policy bypass in the CSS Parsing and Computation component

Same-origin policy bypass in the CSS Parsing and Computation component. This vulnerability was fixed in Firefox 148.0.2.

CVSS 3.1 · 6.5 Medium EPSS < 1% KEV · Not listed
Vendors
Mozilla
Products
Firefox
CVE-2026-3847

Memory safety bugs fixed in Firefox 148.0.2

Memory safety bugs present in Firefox 148.0.2. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 148.0.2.

CVSS 3.1 · 8.8 High EPSS < 1% KEV · Not listed
Vendors
Mozilla
Products
Firefox
CVE-2026-4684

Race condition, use-after-free in the Graphics: WebRender component

Race condition, use-after-free in the Graphics: WebRender component. This vulnerability was fixed in Firefox 149, Firefox ESR 115.34, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.

CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed
Vendors
Mozilla
Products
Firefox Firefox Esr
CVE-2026-4685

Incorrect boundary conditions in the Graphics: Canvas2D component

Incorrect boundary conditions in the Graphics: Canvas2D component. This vulnerability was fixed in Firefox 149, Firefox ESR 115.34, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.

CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed
Vendors
Mozilla
Products
Firefox Firefox Esr
CVE-2026-4686

Incorrect boundary conditions in the Graphics: Canvas2D component

Incorrect boundary conditions in the Graphics: Canvas2D component. This vulnerability was fixed in Firefox 149, Firefox ESR 115.34, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.

CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed
Vendors
Mozilla
Products
Firefox Firefox Esr
CVE-2026-4687

Sandbox escape due to incorrect boundary conditions in the Telemetry component

Sandbox escape due to incorrect boundary conditions in the Telemetry component. This vulnerability was fixed in Firefox 149, Firefox ESR 115.34, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.

CVSS 3.1 · 9.6 Critical EPSS < 1% KEV · Not listed
Vendors
Mozilla
Products
Firefox Firefox Esr
CVE-2026-4688

Sandbox escape due to use-after-free in the Disability Access APIs component

Sandbox escape due to use-after-free in the Disability Access APIs component. This vulnerability was fixed in Firefox 149, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.

CVSS 3.1 · 9.6 Critical EPSS < 1% KEV · Not listed
Vendors
Mozilla
Products
Firefox Firefox Esr
CVE-2026-4689

Sandbox escape due to incorrect boundary conditions, integer overflow in the XPCOM component

Sandbox escape due to incorrect boundary conditions, integer overflow in the XPCOM component. This vulnerability was fixed in Firefox 149, Firefox ESR 115.34, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.

CVSS 3.1 · 10 Critical EPSS < 1% KEV · Not listed
Vendors
Mozilla
Products
Firefox Firefox Esr Thunderbird
CVE-2026-4690

Sandbox escape due to incorrect boundary conditions, integer overflow in the XPCOM component

Sandbox escape due to incorrect boundary conditions, integer overflow in the XPCOM component. This vulnerability was fixed in Firefox 149, Firefox ESR 115.34, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.

CVSS 3.1 · 9.6 Critical EPSS < 1% KEV · Not listed
Vendors
Mozilla
Products
Firefox Firefox Esr
CVE-2026-4691

Use-after-free in the CSS Parsing and Computation component

Use-after-free in the CSS Parsing and Computation component. This vulnerability was fixed in Firefox 149, Firefox ESR 115.34, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.

CVSS 3.1 · 9.8 Critical EPSS < 1% KEV · Not listed
Vendors
Mozilla
Products
Firefox Firefox Esr
CVE-2026-4692

Sandbox escape in the Responsive Design Mode component

Sandbox escape in the Responsive Design Mode component. This vulnerability was fixed in Firefox 149, Firefox ESR 115.34, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.

CVSS 3.1 · 9.6 Critical EPSS < 1% KEV · Not listed
Vendors
Mozilla
Products
Firefox Firefox Esr Thunderbird