CVE-2026-74976

CVE-2026-74976 is a JIT miscompilation in the JavaScript Engine: JIT component of Mozilla Firefox and Thunderbird. The vulnerability can lead to high confidentiality impact (information disclosure) with no integrity or availability impact, per the CVSS 3.1 score of 6.5 (MEDIUM) . Attack requires ...

CVE-2025-11713

CVE-2025-11713: Potential user-assisted code execution via the Copy as cURL feature. Affected products per the sources include Firefox versions prior to 144, Firefox ESR prior to 140.4, Thunderbird versions prior to 144, and Thunderbird prior to 140.4. Root cause: insufficient escaping in the Cop...

CVE-2026-12321

Summary: CVE-2026-12321 is a JIT miscompilation in the JavaScript: WebAssembly component. Affected products: Firefox and Thunderbird (WebAssembly/JS engine). Root cause: JIT miscompilation in the WebAssembly component. Impact: Not explicitly quantified beyond miscompilation; CVSS v3.1 base score ...

CVE-2026-16402

CVE-2026-16402 describes an integer overflow in the Graphics: ImageLib component. The vulnerability is confirmed across multiple advisories and vendors (SUSE, Ubuntu OSV, Debian, EUVD, CIRCL, CVE.org, etc.). The issue is fixed in Firefox version 153. The available connected sources do not provide...

CVE-2026-4718

CVE-2026-4718 is an undefined behavior vulnerability in the WebRTC: Signaling component that affects Firefox and Thunderbird products. Public advisories indicate fixes in Firefox 149 and Firefox ESR 140.9, and Thunderbird 149 and Thunderbird 140.9. The connected sources also enumerate broader Moz...

CVE-2026-74948

CVE-2026-74948 is an information disclosure vulnerability in the Graphics component of Mozilla Firefox and Thunderbird. The CVSS 3.1 base score is 6.5 (MEDIUM) with a vector of AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N, meaning a remote attacker with user interaction can achieve high confidentiality im...

CVE-2026-74970

A site isolation flaw in Mozilla's Graphics component affects Firefox and Thunderbird. The issue allows a remote, unauthenticated attacker to potentially access or modify data in other process contexts via a crafted web page. Fixed in Firefox 154, Firefox ESR 153.1, Thunderbird 154, and Thunderbi...

CVE-2025-11715

CVE-2025-11715 is part of a family of memory-safety issues affecting Mozilla Firefox and Thunderbird. Connected sources confirm memory safety bugs and memory corruption with potential to execute arbitrary code, affecting Firefox/Thunderbird and their ESR releases prior to version 144 (and ESR 140...

CVE-2026-74959

CVE-2026-74959 is a mitigation bypass in the Storage: Cache API component of Mozilla Firefox and Thunderbird . The CVSS 3.1 score is 9.1 (CRITICAL) with a network attack vector, low complexity, no privileges or user interaction required, and high impact on both confidentiality and integrity. CISA...

CVE-2026-74969

CVE-2026-74969 is a use-after-free vulnerability in the Layout: Text and Fonts component of Mozilla Firefox and Thunderbird. It carries a CVSS 3.1 score of 8.8 (HIGH) with a network attack vector, low complexity, no privileges required, and user interaction required, impacting confidentiality, in...

CVE-2026-74974

The vulnerability is a same-origin policy bypass in the Graphics: ImageLib component of Firefox and Thunderbird. Affected versions include Firefox ESR 140.13, ESR 153.0, and Thunderbird ESR 140.13, ESR 153.0. Remediation is to upgrade to Firefox ESR 140.14, ESR 153.1, Thunderbird 140.14, or Thund...

CVE-2026-8967

CVE-2026-8967 affects Mozilla graphics stack via the Graphics: WebGPU component, leading to information disclosure. Public documentation in connected sources indicates the vulnerability was fixed in Firefox 151 and Thunderbird 151, with affected products listed as Mozilla Thunderbird and Mozilla ...

CVE-2026-16376

CVE-2026-16376 is a denial-of-service vulnerability in the Graphics: WebGPU component of Firefox. Affected software refers to Mozilla Firefox before version 153, where the issue was fixed in Firefox 153. The available sources confirm a DoS impact in the Graphics: WebGPU pipeline but do not provid...

CVE-2026-16378

CVE-2026-16378 concerns a DOM-related issue in Firefox’s Copy & Paste and Drag & Drop component. The vulnerability is fixed in Firefox 153. CVSSv3.1 metrics indicate high impact with network attack vector, low complexity, no privileges, and no user interaction required, but the document does not ...

CVE-2026-74943

A use-after-free in Firefox/Thunderbird's Graphics: ImageLib component (CVE-2026-74943) carries a CVSS 9.8 Critical score (AV:N/AC:L/PR:N/UI:N) enabling remote arbitrary code execution with no user interaction. It is fixed in Firefox 154, Firefox ESR 115.39/140.14/153.1, Thunderbird 154/140.14/15...

CVE-2026-0889

CVE-2026-0889 describes a Denial-of-Service in the DOM: Service Workers component, affecting Mozilla Firefox and Mozilla Thunderbird versions earlier than 147. The CVE’s publicly documented impact is DoS with the DOM Service Workers, and the related advisory notes advise updating to the latest ve...

CVE-2026-4727

CVE-2026-4727 is a denial-of-service vulnerability in the NSS Libraries component used by Firefox and Thunderbird. The issue targets the Libraries code and can cause an outage or service disruption, with Mozilla noting a fix implemented in Firefox 149 and Thunderbird 149. The CVE is linked to mul...

CVE-2026-74968

Firefox's WebRender component has a site isolation flaw allowing cross-site data access or tampering, rated CVSS 5.4 (Medium). Fixed in Firefox 154 and Firefox ESR 153.1. No in-the-wild exploitation reported. Users should update immediately. Mozilla advisories: mfsa2026-74, mfsa2026-77.

CVE-2025-14326

CVE-2025-14326 is a use-after-free in the Audio/Video: GMP component affecting Firefox < 146 and Thunderbird

CVE-2026-4724

CVE-2026-4724 affects Mozilla Firefox and Mozilla Thunderbird. The root cause is undefined behavior in the Audio/Video component, leading to potential security bypass or other impacts as described in the connected records. The vulnerability is reported across multiple sources (CNVD EUVD entries) ...

CVE-2026-5735

CVE-2026-5735 affects Mozilla Firefox and Thunderbird 149.0.1, with memory safety bugs that can cause memory corruption and, per sources, could be exploited to run arbitrary code. Affected components are within Firefox/Thunderbird rendering and memory management; the issue has been fixed in Firef...

CVE-2026-74963

Firefox and Thunderbird suffer a same-origin policy bypass in their Networking: Cookies component, allowing cross-origin access to cookies. CVSS 5.4 (Medium). Fixed in Firefox 154, ESR 140.14, ESR 153.1, Thunderbird 154, 140.14, 153.1. No in-the-wild exploitation reported; user interaction requir...

CVE-2026-74972

Information disclosure in Firefox/Thunderbird's DOM: Push Subscriptions component exposes sensitive data to malicious sites. CVSS 4.3 (MEDIUM), network-reachable with user interaction required. Fixed in Firefox 154, ESR 140.14/153.1, Thunderbird 154/140.14/153.1. No in-the-wild exploitation repor...

CVE-2026-74977

CVE-2026-74977 is an integer overflow in the Graphics component of Firefox and Thunderbird , rated CVSS 7.5 (High) with a network attack vector requiring no user interaction or privileges, resulting in a high availability impact (denial of service). CISA SSVC assesses no known exploitation , auto...

CVE-2026-6781

CVE-2026-6781 is a denial-of-service vulnerability in the Mozilla Firefox/Thunderbird Audio/Video: Playback component. The issue is fixed in Firefox 150 and Thunderbird 150. Affected products are Firefox and Thunderbird; the root cause is described only as a DoS in the playback component, with no...

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 ...

CVE-2026-74966

Firefox and Thunderbird are vulnerable to information disclosure via the Form Autofill component. CVSS 7.5 (network, no auth/interaction required) rates it HIGH for confidentiality. CISA SSVC marks exploitation as none. Fix: upgrade to Firefox 154, Firefox ESR 153.1, Thunderbird 154, or Thunderbi...

CVE-2026-74973

CVE-2026-74973 is a race condition leading to use-after-free in the Graphics component of Mozilla Firefox and Thunderbird. The CVSS 3.1 score is 4.2 (Medium) , reflecting a network attack vector with high complexity, required user interaction, and low impact on confidentiality and integrity with ...

CVE-2026-74984

A race condition in the Firefox/Thunderbird JavaScript Engine allows remote attackers (with user interaction) to achieve high confidentiality and integrity impact. CISA reports no exploitation. Remediation: upgrade to Firefox 154, Firefox ESR 153.1, Thunderbird 154, or Thunderbird 153.1.

CVE-2026-0888

CVE-2026-0888 relates to information disclosure in the XML component in Mozilla Firefox and Thunderbird prior to version 147. Affected products include Firefox < 147 and Thunderbird

CVE-2026-74958

CVE-2026-74958 is an information disclosure vulnerability in the WebRTC component of Mozilla Firefox and Thunderbird. The CVSS 3.1 score is 7.5 (HIGH) , with a network attack vector requiring no privileges or user interaction, and a high impact on confidentiality. CISA SSVC assesses exploitation ...

CVE-2026-74981

Mozilla Firefox and Thunderbird are vulnerable to a site isolation bypass in the Audio/Video: Web Codecs component, allowing cross-origin data access (CVSS 8.1, HIGH). Exploitation requires user interaction; no in-the-wild exploitation is reported. Remediation: upgrade to Firefox 154/ESR 153.1 or...

CVE-2026-74982

CVE-2026-74982 is a denial-of-service vulnerability in the Widget component of Firefox and Thunderbird . The CVSS 3.1 score is 7.5 (High) , with a network attack vector requiring no privileges or user interaction, resulting in high availability impact. CISA's SSVC assessment indicates no known ex...