Threat Entry Updated 2026-01-22

CVE-2026-0892 - Thunderbird Plugin

Memory safety bugs present in Firefox 146 and Thunderbird 146. 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 affects Firefox < 147 and Thunderbird < 147.

PLUGIN Thunderbird

CVE-2026-0892

CRITICAL CVSS 9.8 2026-01-13

Risk Score

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Threat Entry Updated 2026-01-22

CVE-2026-0891 - Thunderbird Plugin

Memory safety bugs present in Firefox ESR 140.6, Thunderbird ESR 140.6, Firefox 146 and Thunderbird 146. 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 affects Firefox < 147, Firefox ESR < 140.7, Thunderbird < 147, and Thunderbird < 140.7.

PLUGIN Thunderbird

CVE-2026-0891

HIGH CVSS 8.1 2026-01-13

Risk Score

Open Full Technical Breakdown

Threat Entry Updated 2026-01-22

CVE-2026-0889 - Thunderbird Plugin

Denial-of-service in the DOM: Service Workers component. This vulnerability affects Firefox < 147 and Thunderbird < 147.

PLUGIN Thunderbird

CVE-2026-0889

HIGH CVSS 7.5 2026-01-13

Risk Score

Open Full Technical Breakdown

Threat Entry Updated 2026-01-22

CVE-2026-0885 - Thunderbird Plugin

Use-after-free in the JavaScript: GC component. This vulnerability affects Firefox < 147, Firefox ESR < 140.7, Thunderbird < 147, and Thunderbird < 140.7.

PLUGIN Thunderbird

CVE-2026-0885

MEDIUM CVSS 6.5 2026-01-13

Risk Score

Open Full Technical Breakdown

Threat Entry Updated 2026-01-22

CVE-2026-0890 - Thunderbird Plugin

Spoofing issue in the DOM: Copy & Paste and Drag & Drop component. This vulnerability affects Firefox < 147, Firefox ESR < 140.7, Thunderbird < 147, and Thunderbird < 140.7.

PLUGIN Thunderbird

CVE-2026-0890

MEDIUM CVSS 5.4 2026-01-13

Risk Score

Open Full Technical Breakdown

Threat Entry Updated 2026-01-22

CVE-2026-0888 - Thunderbird Plugin

Information disclosure in the XML component. This vulnerability affects Firefox < 147 and Thunderbird < 147.

PLUGIN Thunderbird

CVE-2026-0888

MEDIUM CVSS 5.3 2026-01-13

Risk Score

Open Full Technical Breakdown

Threat Entry Updated 2026-01-22

CVE-2026-0886 - Thunderbird Plugin

Incorrect boundary conditions in the Graphics component. This vulnerability affects Firefox < 147, Firefox ESR < 115.32, Firefox ESR < 140.7, Thunderbird < 147, and Thunderbird < 140.7.

PLUGIN Thunderbird

CVE-2026-0886

MEDIUM CVSS 5.3 2026-01-13

Risk Score

Open Full Technical Breakdown

Threat Entry Updated 2026-01-22

CVE-2026-0887 - Thunderbird Plugin

Clickjacking issue, information disclosure in the PDF Viewer component. This vulnerability affects Firefox < 147, Firefox ESR < 140.7, Thunderbird < 147, and Thunderbird < 140.7.

PLUGIN Thunderbird

CVE-2026-0887

MEDIUM CVSS 4.3 2026-01-13

Risk Score

Open Full Technical Breakdown

Threat Entry Updated 2026-01-22

CVE-2026-0881 - Thunderbird Plugin

Sandbox escape in the Messaging System component. This vulnerability affects Firefox < 147 and Thunderbird < 147.

PLUGIN Thunderbird

CVE-2026-0881

CRITICAL CVSS 10.0 2026-01-13

Risk Score

Open Full Technical Breakdown

Threat Entry Updated 2026-01-22

CVE-2026-0884 - Thunderbird Plugin

Use-after-free in the JavaScript Engine component. This vulnerability affects Firefox < 147, Firefox ESR < 140.7, Thunderbird < 147, and Thunderbird < 140.7.

PLUGIN Thunderbird

CVE-2026-0884

CRITICAL CVSS 9.8 2026-01-13

Risk Score

Open Full Technical Breakdown

Threat Entry Updated 2026-01-22

CVE-2026-0879 - Thunderbird Plugin

Sandbox escape due to incorrect boundary conditions in the Graphics component. This vulnerability affects Firefox < 147, Firefox ESR < 115.32, Firefox ESR < 140.7, Thunderbird < 147, and Thunderbird < 140.7.

PLUGIN Thunderbird

CVE-2026-0879

CRITICAL CVSS 9.8 2026-01-13

Risk Score

Open Full Technical Breakdown

Threat Entry Updated 2026-01-22

CVE-2026-0882 - Thunderbird Plugin

Use-after-free in the IPC component. This vulnerability affects Firefox < 147, Firefox ESR < 115.32, Firefox ESR < 140.7, Thunderbird < 147, and Thunderbird < 140.7.

PLUGIN Thunderbird

CVE-2026-0882

HIGH CVSS 8.8 2026-01-13

Risk Score

Open Full Technical Breakdown

Threat Entry Updated 2026-01-22

CVE-2026-0880 - Thunderbird Plugin

Sandbox escape due to integer overflow in the Graphics component. This vulnerability affects Firefox < 147, Firefox ESR < 115.32, Firefox ESR < 140.7, Thunderbird < 147, and Thunderbird < 140.7.

PLUGIN Thunderbird

CVE-2026-0880

HIGH CVSS 8.8 2026-01-13

Risk Score

Open Full Technical Breakdown

Threat Entry Updated 2026-01-22

CVE-2026-0877 - Thunderbird Plugin

Mitigation bypass in the DOM: Security component. This vulnerability affects Firefox < 147, Firefox ESR < 115.32, Firefox ESR < 140.7, Thunderbird < 147, and Thunderbird < 140.7.

PLUGIN Thunderbird

CVE-2026-0877

HIGH CVSS 8.1 2026-01-13

Risk Score

Open Full Technical Breakdown

Threat Entry Updated 2026-01-22

CVE-2026-0878 - Thunderbird Plugin

Sandbox escape due to incorrect boundary conditions in the Graphics: CanvasWebGL component. This vulnerability affects Firefox < 147, Firefox ESR < 140.7, Thunderbird < 147, and Thunderbird < 140.7.

PLUGIN Thunderbird

CVE-2026-0878

HIGH CVSS 8.0 2026-01-13

Risk Score

Open Full Technical Breakdown

Threat Entry Updated 2026-01-22

CVE-2026-0883 - Thunderbird Plugin

Information disclosure in the Networking component. This vulnerability affects Firefox < 147, Firefox ESR < 140.7, Thunderbird < 147, and Thunderbird < 140.7.

PLUGIN Thunderbird

CVE-2026-0883

MEDIUM CVSS 5.3 2026-01-13

Risk Score

Open Full Technical Breakdown