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EPSS
| CVE | CVSS | EPSS | Vendor, product | Description | Modified |
|---|---|---|---|---|---|
| CVE-2023-4052 | 6.5 medium | 1.0% | mozilla, firefox, firefox_esr | The Firefox updater created a directory writable by non-privileged users. When uninstalling Firefox, any files in that directory would be recursively deleted with the permissions of the uninstalling user account. This could be combined with creation of a junction (a form of symbolic link) to allow arbitrary file deletion controlled by the non-privileged user. *This bug only affects Firefox on Windows. Other operating systems are unaffected.* This vulnerability affects Firefox < 116, Firefox ESR < 115.1, and Thunderbird < 115.1. | Fri 23 Oct |
| CVE-2023-4049 | 5.9 medium | 1.0% | mozilla, debian, firefox, debian_linux | Race conditions in reference counting code were found through code inspection. These could have resulted in potentially exploitable use-after-free vulnerabilities. This vulnerability affects Firefox < 116, Firefox ESR < 102.14, and Firefox ESR < 115.1. | Fri 23 Oct |
| CVE-2023-25730 | 5.4 medium | 1.0% | mozilla, firefox, firefox_esr, thunderbird | A background script invoking <code>requestFullscreen</code> and then blocking the main thread could force the browser into fullscreen mode indefinitely, resulting in potential user confusion or spoofing attacks. This vulnerability affects Firefox < 110, Thunderbird < 102.8, and Firefox ESR < 102.8. | Sat 24 Oct |
| CVE-2023-4045 | 5.3 medium | 1.0% | mozilla, debian, firefox, debian_linux | Offscreen Canvas did not properly track cross-origin tainting, which could have been used to access image data from another site in violation of same-origin policy. This vulnerability affects Firefox < 116, Firefox ESR < 102.14, and Firefox ESR < 115.1. | Sat 24 Oct |
| CVE-2024-9398 | 5.3 medium | 1.0% | mozilla, firefox, thunderbird | By checking the result of calls to `window.open` with specifically set protocol handlers, an attacker could determine if the application which implements that protocol handler is installed. This vulnerability affects Firefox < 131, Firefox ESR < 128.3, Thunderbird < 128.3, and Thunderbird < 131. | 8 Oct |
| CVE-2023-32212 | 4.3 medium | 1.0% | mozilla, firefox, firefox_esr, thunderbird | An attacker could have positioned a `datalist` element to obscure the address bar. This vulnerability affects Firefox < 113, Firefox ESR < 102.11, and Thunderbird < 102.11. | Sat 24 Oct |
| CVE-2023-34414 | 3.1 low | 1.0% | mozilla, firefox, firefox_esr, thunderbird | The error page for sites with invalid TLS certificates was missing the activation-delay Firefox uses to protect prompts and permission dialogs from attacks that exploit human response time delays. If a malicious page elicited user clicks in precise locations immediately before navigating to a site with a certificate error and made the renderer extremely busy at the same time, it could create a gap between when the error page was loaded and when the display actually refreshed. With the right timing the elicited clicks could land in that gap and activate the button that overrides the certificate error for that site. This vulnerability affects Firefox ESR < 102.12, Firefox < 114, and Thunderbird < 102.12. | Sat 24 Oct |
| CVE-2026-57501 | 0.0 none | 1.0% | no CPE yet | Zen is a firefox-based browser. Prior to 1.21.5b, Zen's glance and split-view context-menu actions, Open link in glance and Split link in new tab, load a page-controlled link URL with the System principal instead of the originating page's principal, allowing a malicious web page to place a link to a file URL that can load with System privileges when opened through either context-menu item and bypass the content-to-file security check that blocks an ordinary click. This issue is fixed in version 1.21.5b. | Sun 25 Oct |
| CVE-2026-6771 | 9.8 critical | 0.00% | mozilla, firefox, thunderbird | Mitigation bypass in the DOM: Security component. This vulnerability was fixed in Firefox 150, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10. | Mon 26 Oct |
| CVE-2026-6748 | 9.8 critical | 0.00% | mozilla, firefox, thunderbird | Uninitialized memory in the Audio/Video: Web Codecs component. This vulnerability was fixed in Firefox 150, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10. | Mon 26 Oct |
| CVE-2026-8094 | 9.8 critical | 0.00% | mozilla, firefox, thunderbird | Other issue in the WebRTC component. This vulnerability was fixed in Firefox ESR 140.10.2 and Thunderbird 140.10.2. | Mon 26 Oct |
| CVE-2026-109780 | 9.8 critical | 0.00% | no CPE yet | Mitigation bypass in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 158 and Thunderbird 158. | Mon 26 Oct |
| CVE-2026-109774 | 9.8 critical | 0.00% | no CPE yet | Invalid pointer, undefined behavior in the DOM: Notifications component. This vulnerability was fixed in Firefox 158 and Thunderbird 158. | Mon 26 Oct |
| CVE-2026-8401 | 9.8 critical | 0.00% | mozilla, firefox | Sandbox escape in the Profile Backup component. This vulnerability was fixed in Firefox 150.0.3, Firefox ESR 115.36, Firefox ESR 140.11, and Thunderbird 140.11. | Mon 26 Oct |
| CVE-2026-12293 | 9.8 critical | 0.00% | mozilla, firefox, thunderbird | Use-after-free in the Graphics: WebGPU component. This vulnerability was fixed in Firefox 152 and Thunderbird 152. | Mon 26 Oct |
| CVE-2026-6760 | 9.8 critical | 0.00% | mozilla, firefox, thunderbird | Mitigation bypass in the Networking: Cookies component. This vulnerability was fixed in Firefox 150 and Thunderbird 150. | Mon 26 Oct |
| CVE-2026-6768 | 9.8 critical | 0.00% | mozilla, firefox, thunderbird | Mitigation bypass in the Networking: Cookies component. This vulnerability was fixed in Firefox 150 and Thunderbird 150. | Mon 26 Oct |
| CVE-2026-8091 | 9.8 critical | 0.00% | mozilla, firefox, thunderbird | Incorrect boundary conditions in the Audio/Video: Playback component. This vulnerability was fixed in Firefox 150, Thunderbird 150, Firefox ESR 140.10.1, Thunderbird 140.10.1, and Firefox ESR 115.35.2. | Mon 26 Oct |
| CVE-2026-14241 | 9.8 critical | 0.00% | mozilla, firefox | Memory safety bugs present in Firefox 152.0.3. 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 was fixed in Firefox 152.0.4. | Sun 25 Oct |
| CVE-2026-16349 | 9.8 critical | 0.00% | mozilla, firefox, thunderbird | Same-origin policy bypass in the DOM: Navigation component. This vulnerability was fixed in Firefox 153, Firefox ESR 115.38, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13. | Sat 24 Oct |
| CVE-2026-16358 | 9.8 critical | 0.00% | mozilla, firefox, thunderbird | Site isolation issue in the Graphics: WebRender component. This vulnerability was fixed in Firefox 153, Firefox ESR 115.38, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13. | Sat 24 Oct |
| CVE-2026-16375 | 9.8 critical | 0.00% | mozilla, firefox, thunderbird | Site isolation issue in the Networking: HTTP component. This vulnerability was fixed in Firefox 153, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13. | Sat 24 Oct |
| CVE-2026-16387 | 9.8 critical | 0.00% | mozilla, firefox, thunderbird | Site isolation issue in the Networking component. This vulnerability was fixed in Firefox 153, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13. | Sat 24 Oct |
| CVE-2026-5731 | 9.8 critical | 0.00% | mozilla, firefox, thunderbird | Memory safety bugs present in Firefox ESR 115.34.0, Firefox ESR 140.9.0, Thunderbird ESR 140.9.0, Firefox 149.0.1 and Thunderbird 149.0.1. 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 was fixed in Firefox 149.0.2, Firefox ESR 115.34.1, Firefox ESR 140.9.1, Thunderbird 149.0.2, and Thunderbird 140.9.1. | Sat 24 Oct |
| CVE-2026-5734 | 9.8 critical | 0.00% | mozilla, firefox, thunderbird | Memory safety bugs present in Firefox ESR 140.9.0, Thunderbird ESR 140.9.0, Firefox 149.0.1 and Thunderbird 149.0.1. 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 was fixed in Firefox 149.0.2, Firefox ESR 140.9.1, Thunderbird 149.0.2, and Thunderbird 140.9.1. | Fri 23 Oct |
| CVE-2026-5735 | 9.8 critical | 0.00% | mozilla, firefox, thunderbird | Memory safety bugs present in Firefox 149.0.1 and Thunderbird 149.0.1. 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 was fixed in Firefox 149.0.2 and Thunderbird 149.0.2. | Fri 23 Oct |
| CVE-2025-11709 | 9.8 critical | 0.00% | mozilla, firefox, thunderbird | A compromised web process was able to trigger out of bounds reads and writes in a more privileged process using manipulated WebGL textures. This vulnerability was fixed in Firefox 144, Firefox ESR 115.29, Firefox ESR 140.4, Thunderbird 144, and Thunderbird 140.4. | Fri 23 Oct |
| CVE-2025-11710 | 9.8 critical | 0.00% | mozilla, firefox, thunderbird | A compromised web process using malicious IPC messages could have caused the privileged browser process to reveal blocks of its memory to the compromised process. This vulnerability was fixed in Firefox 144, Firefox ESR 115.29, Firefox ESR 140.4, Thunderbird 144, and Thunderbird 140.4. | Fri 23 Oct |
| CVE-2026-100788 | 9.8 critical | 0.00% | mozilla, firefox, thunderbird | Invalid pointer in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, and Firefox ESR 140.17. | 19 Oct |
| CVE-2025-11719 | 9.8 critical | 0.00% | mozilla, firefox, thunderbird | Starting in Thunderbird 143, the use of the native messaging API by web extensions on Windows could lead to crashes caused by use-after-free memory corruption. This vulnerability was fixed in Firefox 144 and Thunderbird 144. | 18 Oct |
| CVE-2025-11721 | 9.8 critical | 0.00% | mozilla, firefox, thunderbird | Memory safety bug present in Firefox 143 and Thunderbird 143. This bug showed evidence of memory corruption and we presume that with enough effort this could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 144 and Thunderbird 144. | 18 Oct |
| CVE-2025-13021 | 9.8 critical | 0.00% | mozilla, firefox | Incorrect boundary conditions in the Graphics: WebGPU component. This vulnerability was fixed in Firefox 145 and Thunderbird 145. | 18 Oct |
| CVE-2025-13022 | 9.8 critical | 0.00% | mozilla, firefox | Incorrect boundary conditions in the Graphics: WebGPU component. This vulnerability was fixed in Firefox 145 and Thunderbird 145. | 18 Oct |
| CVE-2025-13023 | 9.8 critical | 0.00% | mozilla, firefox | Sandbox escape due to incorrect boundary conditions in the Graphics: WebGPU component. This vulnerability was fixed in Firefox 145 and Thunderbird 145. | 18 Oct |
| CVE-2025-13024 | 9.8 critical | 0.00% | mozilla, firefox | JIT miscompilation in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 145 and Thunderbird 145. | 18 Oct |
| CVE-2025-13026 | 9.8 critical | 0.00% | mozilla, firefox | Sandbox escape due to incorrect boundary conditions in the Graphics: WebGPU component. This vulnerability was fixed in Firefox 145 and Thunderbird 145. | 18 Oct |
| CVE-2026-106016 | 9.8 critical | 0.00% | mozilla, firefox | Mitigation bypass in the File Handling component. This vulnerability was fixed in Firefox 157.0.1 and Thunderbird 158. | 13 Oct |
| CVE-2025-12380 | 9.8 critical | 0.00% | mozilla, firefox | Starting with Firefox 142, it was possible for a compromised child process to trigger a use-after-free in the GPU or browser process using WebGPU-related IPC calls. This may have been usable to escape the child process sandbox. This vulnerability was fixed in Firefox 144.0.2. | 8 Oct |
| CVE-2026-109708 | 9.6 critical | 0.00% | no CPE yet | Sandbox escape due to incorrect boundary conditions in the Networking component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, Thunderbird 153.5, and Firefox ESR 115.44. | Tue 27 Oct |
| CVE-2026-109707 | 9.6 critical | 0.00% | no CPE yet | Sandbox escape due to use-after-free in the Networking component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, Thunderbird 153.5, and Firefox ESR 115.44. | Tue 27 Oct |
| CVE-2026-109705 | 9.6 critical | 0.00% | no CPE yet | Sandbox escape, site isolation issue due to incorrect boundary conditions, use-after-free in the Networking component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, Thunderbird 153.5, and Firefox ESR 115.44. | Tue 27 Oct |
| CVE-2026-7321 | 9.6 critical | 0.00% | mozilla, firefox, thunderbird | Sandbox escape due to incorrect boundary conditions in the WebRTC: Networking component. This vulnerability was fixed in Firefox 150, Thunderbird 150, Firefox ESR 140.10.1, and Thunderbird 140.10.1. | Mon 26 Oct |
| CVE-2026-12294 | 9.6 critical | 0.00% | mozilla, firefox, thunderbird | Sandbox escape in the DOM: Workers component. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Firefox ESR 115.37, Thunderbird 152, and Thunderbird 140.12. | Mon 26 Oct |
| CVE-2026-12296 | 9.6 critical | 0.00% | mozilla, firefox, thunderbird | Sandbox escape in the Security: Process Sandboxing component. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Thunderbird 152, and Thunderbird 140.12. | Mon 26 Oct |
| CVE-2026-12297 | 9.6 critical | 0.00% | mozilla, firefox, thunderbird | Sandbox escape due to incorrect boundary conditions in the Networking component. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Firefox ESR 115.37, Thunderbird 152, and Thunderbird 140.12. | Mon 26 Oct |
| CVE-2026-109750 | 9.6 critical | 0.00% | no CPE yet | Site isolation issue in the DOM: Web Authentication component. This vulnerability was fixed in Firefox 158 and Thunderbird 158. | 19 Oct |
| CVE-2026-100800 | 9.6 critical | 0.00% | mozilla, firefox, thunderbird | Sandbox escape due to use-after-free in the Disability Access APIs component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 153.4, and Firefox 157. | 19 Oct |
| CVE-2026-100804 | 9.6 critical | 0.00% | mozilla, firefox, thunderbird | Sandbox escape due to use-after-free in the Preferences: Backend component. This vulnerability was fixed in Thunderbird 157 and Firefox 157. | 19 Oct |
| CVE-2026-100794 | 9.6 critical | 0.00% | mozilla, firefox, thunderbird | Sandbox escape due to incorrect boundary conditions in the Internationalization component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, and Firefox ESR 140.17. | 19 Oct |
| CVE-2026-109745 | 9.6 critical | 0.00% | no CPE yet | Sandbox escape due to uninitialized memory in the DOM: Web Serial component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5. | 19 Oct |
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EPSS scores: 2026-10-28. NVD cursor: 2026-10-29 00:22. The News page shows only notable CVEs (KEV, your stack, new criticals, EPSS over 50%, or active exploitation per SSVC); this table has all of them.