CVE-2026-74942

A privilege escalation flaw in Firefox's Remote Settings Client component allows a remote attacker to gain full system access with no authentication and low complexity. CVSS 8.8 (HIGH). CISA's SSVC rates technical impact as total but confirms no active exploitation. Fixed in Firefox 154, Firefox ...

EUVD-2026-60752

Information disclosure in the Graphics: Text component. This vulnerability was fixed in Firefox 154, Firefox ESR 115.39, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1...

CVE-2026-74944 Use-after-free in the DOM: Core & HTML component

Use-after-free in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 154, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1...

CVE-2026-74942

Privilege escalation in the Remote Settings Client component. This vulnerability was fixed in Firefox 154, Firefox ESR 115.39, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1...

CVE-2026-74942 Privilege escalation in the Remote Settings Client component

Privilege escalation in the Remote Settings Client component. This vulnerability was fixed in Firefox 154, Firefox ESR 115.39, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1...

CVE-2026-74939 Privilege escalation in the DOM: Navigation component

Privilege escalation in the DOM: Navigation component. This vulnerability was fixed in Firefox 154, Firefox ESR 115.39, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1...

CVE-2026-74941

Privilege escalation in the Graphics: CanvasWebGL component. This vulnerability was fixed in Firefox 154, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1...

EUVD-2026-60745

Use-after-free in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox 154, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1...

CVE-2026-74936 Use-after-free in the JavaScript: WebAssembly component

Use-after-free in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox 154, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1...

CVE-2026-74936

A use-after-free in the JavaScript: WebAssembly component of Firefox/Thunderbird can lead to memory corruption and arbitrary code execution. CVSS 9.8 (network, no auth required). Fixed in Firefox 154, ESR 140.14, ESR 153.1, Thunderbird 154, 140.14, and 153.1; Debian and Slackware packages updated...

PT-2026-77000

Name of the Vulnerable Software and Affected Versions Firefox versions prior to 154 Firefox ESR versions prior to 140.14 Firefox ESR versions prior to 153.1 Thunderbird versions prior to 154 Thunderbird versions prior to 140.14 Thunderbird versions prior to 153.1 Description A same-origin policy...

PT-2026-76979

Name of the Vulnerable Software and Affected Versions Firefox versions prior to 154 Firefox ESR versions prior to 115.39 Firefox ESR versions prior to 140.14 Firefox ESR versions prior to 153.1 Thunderbird versions prior to 154 Thunderbird versions prior to 140.14 Thunderbird versions prior to...

PT-2026-76988

Name of the Vulnerable Software and Affected Versions Firefox versions prior to 154 Firefox ESR versions prior to 153.1 Thunderbird versions prior to 154 Thunderbird versions prior to 153.1 Description Privilege escalation exists in the Request Handling component. Recommendations Update Firefox t...

PT-2026-76982

Name of the Vulnerable Software and Affected Versions Firefox versions prior to 154 Firefox ESR versions prior to 140.14 Firefox ESR versions prior to 153.1 Thunderbird versions prior to 154 Thunderbird versions prior to 140.14 Thunderbird versions prior to 153.1 Description Privilege escalation ...

PT-2026-77021

Name of the Vulnerable Software and Affected Versions Firefox versions 153 through 153 Firefox ESR version 153.0 Thunderbird versions 153 through 153 Thunderbird ESR version 153.0 Description Internal bugs were identified that exhibit evidence of memory corruption or other security-relevant...

PT-2026-76986

Name of the Vulnerable Software and Affected Versions Firefox versions prior to 154 Firefox ESR versions prior to 140.14 Firefox ESR versions prior to 153.1 Thunderbird versions prior to 154 Thunderbird versions prior to 140.14 Thunderbird versions prior to 153.1 Description Privilege escalation...

PT-2026-76998

Name of the Vulnerable Software and Affected Versions Firefox versions prior to 154 Firefox ESR versions prior to 140.14 Firefox ESR versions prior to 153.1 Thunderbird versions prior to 154 Thunderbird versions prior to 140.14 Thunderbird versions prior to 153.1 Description Privilege escalation...

PT-2026-77002

Name of the Vulnerable Software and Affected Versions Firefox versions prior to 154 Firefox ESR versions prior to 115.39 Firefox ESR versions prior to 140.14 Firefox ESR versions prior to 153.1 Thunderbird versions prior to 154 Thunderbird versions prior to 140.14 Thunderbird versions prior to...

PT-2026-77007

Name of the Vulnerable Software and Affected Versions Firefox versions prior to 154 Firefox ESR versions prior to 115.39 Firefox ESR versions prior to 140.14 Firefox ESR versions prior to 153.1 Thunderbird versions prior to 154 Thunderbird versions prior to 140.14 Thunderbird versions prior to...

PT-2026-77012

Name of the Vulnerable Software and Affected Versions Firefox versions prior to 154 Firefox ESR versions prior to 153.1 Thunderbird versions prior to 154 Thunderbird versions prior to 153.1 Description A mitigation bypass exists within the Add-ons Manager component. Recommendations Update Firefox...