Firefox, Thunderbird vulnerabilities
23 known CVE vulnerabilities in Firefox, Thunderbird, translated and rated.
- CVE-2026-16408Critical
Integer overflow in the Audio/Video: Playback component in Firefox and Thunderbird. Fixed in versions 153.
- CVE-2026-16395Critical
Integer overflow in the Audio/Video component in Firefox and Thunderbird. Fixed in versions 153.
- CVE-2026-4729Critical
Memory safety bugs were found in Firefox 148 and Thunderbird 148. Some of these bugs showed evidence of memory corruption, which could potentially allow arbitrary code execution. The vulnerabilities were fixed in Firefox 149 and Thunderbird 149.
- CVE-2026-4720Critical
Memory safety bugs were found in Firefox ESR 140.8, Thunderbird ESR 140.8, Firefox 148 and Thunderbird 148. Some of these bugs showed evidence of memory corruption and could potentially be exploited to run arbitrary code with enough effort.
- CVE-2026-2807Critical
Memory safety bugs were found in Firefox 147 and Thunderbird 147. Some of these bugs showed evidence of memory corruption and could potentially be exploited to run arbitrary code. The vulnerability was fixed in Firefox 148 and Thunderbird 148.
- CVE-2026-2792Critical
Memory safety bugs were found in Firefox ESR 140.7, Firefox 147, Thunderbird ESR 140.7, and Thunderbird 147. Some of these bugs showed evidence of memory corruption and could potentially be exploited to run arbitrary code with enough effort.
- CVE-2026-74978High
Clickjacking vulnerability in the Widget component in Firefox and Thunderbird. The issue was fixed in Firefox 154, Firefox ESR 153.1, Thunderbird 154, and Thunderbird 153.1.
- CVE-2026-74977High
Integer overflow in the Graphics component in Firefox and Thunderbird. The issue was fixed in Firefox 154, Firefox ESR 153.1, Thunderbird 154, and Thunderbird 153.1.
- CVE-2026-74965High
Privilege escalation in the Shell Integration component in Firefox and Thunderbird. The issue was fixed in Firefox 154, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.
- CVE-2026-74958High
Information disclosure in the WebRTC component in Firefox and Thunderbird. The issue was fixed in Firefox 154, Firefox ESR 153.1, Thunderbird 154, and Thunderbird 153.1.
- CVE-2026-74955High
Privilege escalation in the Request Handling component in Firefox and Thunderbird. The issue was fixed in Firefox 154, Firefox ESR 153.1, Thunderbird 154, and Thunderbird 153.1.
- CVE-2026-12326High
Memory safety bugs were found in Firefox 151 and Thunderbird 151. Some of these bugs showed evidence of memory corruption, potentially allowing arbitrary code execution. The vulnerabilities were fixed in Firefox 152 and Thunderbird 152.
- CVE-2026-12317High
Memory safety bug fixed in Firefox 152. This vulnerability was fixed in Thunderbird 152 as well.
- CVE-2026-12309Medium
A memory safety bug was fixed in Firefox 152 and Thunderbird 152. This vulnerability also affects Firefox ESR 140.12 and Thunderbird 140.12.
- CVE-2026-12307Medium
A memory safety bug was fixed in Firefox 152 and Thunderbird 152. This vulnerability was also patched in the ESR versions of both Firefox and Thunderbird.
- CVE-2026-12306Medium
A memory safety bug was fixed in Firefox 152 and Thunderbird 152. This vulnerability was also patched in the ESR versions of Firefox and Thunderbird.
- CVE-2026-12301Medium
Memory safety bug fixed in Firefox 152. This vulnerability was also fixed in Thunderbird 152.
- CVE-2026-12300Medium
Memory safety bug fixed in Firefox 152. This vulnerability was also fixed in Thunderbird 152.
- CVE-2026-8971Medium
A same-origin policy bypass exists in the Networking: JAR component of Firefox and Thunderbird. This vulnerability was fixed in Firefox 151 and Thunderbird 151.
- CVE-2026-8964High
Spoofing issue in the Popup Blocker component. This vulnerability was fixed in Firefox 151 and Thunderbird 151.
- CVE-2023-4054Medium
A vulnerability in Firefox allows appref-ms files to be opened without warning the user that they may contain malicious code. This affects Firefox versions below 116 and Thunderbird versions below 102.14 and 115.1 on Windows.
- CVE-2023-37208High
The vulnerability in Firefox and Thunderbird involves the lack of a warning for users when opening Diagcab files that may contain malicious code. This affects Firefox < 115, Firefox ESR < 102.13, and Thunderbird < 102.13.
- CVE-2020-15664Medium
Vulnerability in Firefox browser and Thunderbird mail client. A malicious webpage could access the InstallTrigger object, potentially leading to installation of an unintended or malicious extension.

