CVE-2026-0892

CVE-2026-0892 concerns memory safety bugs in Mozilla Firefox and Thunderbird prior to version 147. The CVE description notes memory corruption with potential for arbitrary code execution, affecting Firefox < 147 and Thunderbird

CVE-2026-12319

CVE-2026-12319 is a reported DoS in the Audio/Video: Playback component. Multiple connected sources confirm the issue affects Firefox and Thunderbird and that it was fixed in Firefox 152 and Thunderbird 152. The CVSS 3.1 vector indicates network attack vector, low attack complexity, no privileges...

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-2026-74967

Firefox and Thunderbird's Audio/Video: Playback component has a same-origin policy bypass (CVSS 5.4, MEDIUM) exploitable via a crafted page requiring user interaction. Fixed in Firefox 154, Firefox ESR 140.14/153.1, Thunderbird 154, and Thunderbird 140.14/153.1. No in-the-wild exploitation report...

CVE-2025-11714

CVE-2025-11714 is a memory-safety vulnerability in Mozilla Firefox/Thunderbird stack, affecting Firefox and Thunderbird releases older than 144 (and Firefox ESR releases older than 115.29/140.4; Thunderbird ESR releases older than 140.4). The connected documents confirm the issue as memory-corrup...

CVE-2025-14330

CVE-2025-14330 describes a JIT miscompilation bug in the JavaScript Engine's JIT component. Affected: Firefox < 146, Firefox ESR < 140.6, Thunderbird < 146, Thunderbird ESR

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-2026-74982

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...

CVE-2026-84128

CVE-2026-84128 is a privilege escalation vulnerability in the WebDriver BiDi component of Firefox , fixed in Firefox 155 . The bug is tracked in Mozilla Bugzilla #2044280 and disclosed via MFSA2026-82 . The CVSS 3.1 score is 8.8 (HIGH) with a network attack vector, low complexity, no privileges r...

CVE-2026-84137

CVE-2026-84137 is a spoofing (Security UI) vulnerability in the DOM: Core & HTML component of Mozilla products, allowing an attacker to spoof the user interface. It was fixed in Firefox 155 , Firefox ESR 153.2 , Thunderbird 155 , and Thunderbird 153.2 . Notably, NVD assigns a 4.3 (Medium) score w...

CVE-2026-8960

Summary: CVE-2026-8960 is a spoofing issue in WebExtensions that affects Firefox (and Thunderbird per NVD) and was fixed in Firefox 151 and Thunderbird 151. According to the sources, the vulnerability has a CVSS v3.1 base score of 7.5 (HIGH) with network attack vector, low attack complexity, no p...

CVE-2026-0882

CVE-2026-0882 : Use-after-free in the IPC component exposed in Firefox < 147, Firefox ESR < 115.32 and < 140.7, Thunderbird < 147 and

CVE-2026-84143

CVE-2026-84143 covers internally found bugs in Thunderbird 154 , Thunderbird ESR 153.1 , and Thunderbird ESR 140.14 , some showing evidence of memory corruption or other security-relevant defects. Mozilla presumes some could have been exploited with enough effort, but no confirmed in-the-wild exp...

CVE-2026-16382

CVE-2026-16382 is a critical mitigation-bypass vulnerability in the Firefox DOM: Service Workers component. The issue affects Firefox versions prior to 153 and is fixed in Firefox 153. The CVSS 3.1 base score is 9.8 (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H). Exploitation details are not provided in t...

CVE-2026-16393

CVE-2026-16393 affects the Graphics: WebGPU component in Firefox. The root cause is incorrect boundary conditions in this component, leading to a potential impact on confidentiality and availability (C:H I:N A:H) with a high-severity rating (CVSS 3.1: 9.1, Network attack, no user interaction). Th...

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-2026-4726

CVE-2026-4726 is a denial-of-service vulnerability in the XML component of Mozilla’s Firefox and Thunderbird. The root cause is an error in the XML parser that can be triggered remotely to exhaust resources. Affected products: Firefox and Thunderbird before version 149. Impact: Denial of service ...

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-2026-84639

CVE-2026-84639 affects Mozilla Thunderbird 's MIME parsing component. Triggering an error condition in certain MIME bodies causes uninitialized memory to be used , leading to a remote denial-of-service as noted by Kaspersky. The CVSS 3.1 score is 9.1 (Critical) with a network attack vector, low c...

CVE-2026-8965

CVE-2026-8965 is an information-disclosure vulnerability in the DOM: Security component, affecting Mozilla Firefox and Mozilla Thunderbird up to version 151. The issue is fixed in Firefox 151 and Thunderbird 151. Affected products include Mozilla Firefox earlier than 151.0 and Mozilla Thunderbird...

CVE-2026-12300

CVE-2026-12300 describes a memory-safety issue that was fixed in Firefox 152 and Thunderbird 152. The available sources confirm the affected products are Mozilla Firefox/Thunderbird, with the underlying problem labeled as a memory safety bug. The CVSS metrics in the initial document indicate a ba...

CVE-2026-4371

CVE-2026-4371 concerns Thunderbird's IMAP parsing. A malicious mail server could send malformed strings with negative lengths, causing the parser to read memory outside the buffer and potentially crash Thunderbird or leak data. Affected are Thunderbird versions prior to 149 and prior to 140.9. Th...

CVE-2026-84140

CVE-2026-84140 is a site isolation issue in the DOM: Navigation component affecting Mozilla Firefox , Firefox ESR , Thunderbird , and Thunderbird ESR . Per Kaspersky analysis, this vulnerability enables remote code execution when exploited, allowing arbitrary code to run on the target system. The...

CVE-2026-0881

CVE-2026-0881 describes a sandbox escape in the Messaging System component affecting Mozilla Firefox and Mozilla Thunderbird before version 147. The root cause is a vulnerability in the Messaging System that can lead to arbitrary code execution with total impact (confidentiality, integrity, and a...

CVE-2026-12323

CVE-2026-12323 describes a spoofing issue in the DOM: Core & HTML component. The vulnerability affected Mozilla Firefox and Thunderbird and was fixed in Firefox 152 and Thunderbird 152. The available references confirm the DOM spoofing flaw and its patch in version 152. Practical impact is modest...

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-2026-4727

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-2026-84134

CVE-2026-84134 is an issue in the Profile Backup component of Mozilla Firefox, Firefox ESR, Thunderbird, and Thunderbird ESR. The NVD description labels it as an "Other issue," while Kaspersky characterizes it as a denial of service vulnerability exploitable remotely. It carries a CVSS 9.8 (CRITI...

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-2025-14332

CVE-2025-14332 is a memory-safety bug found in Firefox 145 and Thunderbird 145, with potential for arbitrary code execution. It affects Firefox and Thunderbird versions older than 146. The connected documents indicate remediation by upgrading to Firefox/Thunderbird 146. If upgrading is not possib...

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-2026-16398

CVE-2026-16398 is a site isolation issue in Firefox's Graphics component. Affected product: Mozilla Firefox prior to version 153. Root cause: site isolation in the Graphics component. Impact: confidentiality impact (C), no integrity or availability impact described; CVSSv3.1 shows 7.5 (HIGH) with...

CVE-2026-16399

Technical details about CVE-2026-16399 are not publicly available in the provided documents. The sources summarize a site isolation issue in the DOM: Navigation component with Firefox fix in version 153. Monitor for updates.

CVE-2026-4728

CVE-2026-4728 : A spoofing issue in the Privacy: Anti-Tracking component is documented for Mozilla Firefox and Mozilla Thunderbird. The connected documents consistently state the vulnerability and that it has been fixed in Firefox 149 and Thunderbird 149 . No additional technical details (root ca...

CVE-2026-84133

CVE-2026-84133 is a site isolation issue in the DOM: Push Subscriptions component of Mozilla products. It affects Firefox (fixed in 155), Firefox ESR (fixed in 153.2), Thunderbird (fixed in 155), and Thunderbird ESR (fixed in 153.2). The CNA-assigned CVSS 3.1 score is 9.8 (Critical) with a vector...

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-2026-84136

CVE-2026-84136 is a remote code execution vulnerability in the DOM: Navigation component of Mozilla products, affecting Firefox (before 155), Firefox ESR (before 153.2), Thunderbird (before 155), and Thunderbird ESR (before 153.2). Per Kaspersky, it can be exploited remotely to execute arbitrary ...

CVE-2026-84141

CVE-2026-84141 is an integer overflow in the Graphics: ImageLib component of Mozilla's image processing library, enabling remote code execution via crafted image content. The vulnerability affects Firefox (before 155), Firefox ESR (before 153.2), Thunderbird (before 155), and Thunderbird ESR (bef...

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-2026-8967

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-2026-84138

CVE-2026-84138 is a denial-of-service vulnerability in the PDF Viewer component of Mozilla Firefox and Thunderbird . It was fixed in Firefox 155 and Thunderbird 155 (also in Firefox ESR 115.40, 140.15, 153.2, and Thunderbird 140.15, 153.2 per the associated Nessus plugins). The NVD rates it CVSS ...

CVE-2026-84142

CVE-2026-84142 covers internally discovered bugs in Thunderbird 154 that showed evidence of memory corruption or other security-relevant defects. Mozilla presumes some could have been exploited with sufficient effort. The fix ships in Thunderbird 155 , Firefox 155 , and corresponding ESR releases...

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-2026-4724

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-2026-84126

CVE-2026-84126 is a vulnerability in the Layout: Grid component of Firefox , caused by incorrect boundary conditions . The flaw allows a network-based attack with low complexity and no required privileges , but user interaction is required (e.g., visiting a crafted page). The impact is limited to...

CVE-2026-84144

CVE-2026-84144 covers internally found bugs in Mozilla Thunderbird 154 and Thunderbird ESR 153.1 , some showing evidence of memory corruption or other security-relevant defects. The vendor presumes some could have been exploited with sufficient effort. The issue is fixed in Thunderbird 155 , Thun...

CVE-2025-14326

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

CVE-2026-84139

A clickjacking vulnerability in the DOM: Events component affects Firefox , Firefox ESR , Thunderbird , and Thunderbird ESR . It was fixed in Firefox 155, Firefox ESR 153.2, Thunderbird 155, and Thunderbird 153.2. The vulnerability is part of a broader batch of issues disclosed via Mozilla adviso...