Mozilla Firefox Esr vulnerabilities

CVE-2023-29542 [CRITICAL] CVE-2023-29542: A newline in a filename could have been used to bypass the file extension security mechanisms that r A newline in a filename could have been used to bypass the file extension security mechanisms that replace malicious file extensions such as .lnk with .download. This could have led to accidental execution of malicious code. *This bug only affects Firefox and Thunderbird on Windows. Other versions of Firefox and Thunderbird are unaffected.* This vulnerab

CVE-2020-6811 [HIGH] CWE-77 CVE-2020-6811: The 'Copy as cURL' feature of Devtools' network tab did not properly escape the HTTP method of a req The 'Copy as cURL' feature of Devtools' network tab did not properly escape the HTTP method of a request, which can be controlled by the website. If a user used the 'Copy as Curl' feature and pasted the command into a terminal, it could have resulted in command injection and arbitrary command execution. This vulnerability affects Thunderbird < 68.6, Fire

CVE-2026-16359 [CRITICAL] Mozilla Foundation Security Advisory 2026-69: CVE-2026-16359 Mozilla Foundation Security Advisory 2026-69 CVE: CVE-2026-16359 Product: Firefox ESR Impact: high Fixed in: Firefox ESR 115.38

CVE-2026-12315 [CRITICAL] Mozilla Foundation Security Advisory 2026-58: CVE-2026-12315 Mozilla Foundation Security Advisory 2026-58 CVE: CVE-2026-12315 Product: Firefox ESR Impact: high Fixed in: Firefox ESR 140.12

CVE-2026-12304 [CRITICAL] Mozilla Foundation Security Advisory 2026-58: CVE-2026-12304 Mozilla Foundation Security Advisory 2026-58 CVE: CVE-2026-12304 Product: Firefox ESR Impact: high Fixed in: Firefox ESR 140.12

CVE-2020-12389 [CRITICAL] CWE-20 CVE-2020-12389: The Firefox content processes did not sufficiently lockdown access control which could result in a s The Firefox content processes did not sufficiently lockdown access control which could result in a sandbox escape. *Note: this issue only affects Firefox on Windows operating systems.*. This vulnerability affects Firefox ESR < 68.8 and Firefox < 76.

CVE-2019-9794 [CRITICAL] CWE-88 CVE-2019-9794: A vulnerability was discovered where specific command line arguments are not properly discarded duri A vulnerability was discovered where specific command line arguments are not properly discarded during Firefox invocation as a shell handler for URLs. This could be used to retrieve and execute files whose location is supplied through these command line arguments if Firefox is configured as the default URI handler for a given URI scheme in third part

CVE-2024-9392 [CRITICAL] CWE-346 CVE-2024-9392: A compromised content process could have allowed for the arbitrary loading of cross-origin pages. Th A compromised content process could have allowed for the arbitrary loading of cross-origin pages. This vulnerability affects Firefox < 131, Firefox ESR < 128.3, Firefox ESR < 115.16, Thunderbird < 128.3, and Thunderbird < 131.

CVE-2020-15663 [HIGH] CWE-427 CVE-2020-15663: If Firefox is installed to a user-writable directory, the Mozilla Maintenance Service would execute If Firefox is installed to a user-writable directory, the Mozilla Maintenance Service would execute updater.exe from the install location with system privileges. Although the Mozilla Maintenance Service does ensure that updater.exe is signed by Mozilla, the version could have been rolled back to a previous version which would have allowed exploitation

CVE-2026-16360 Mozilla Foundation Security Advisory 2026-70: CVE-2026-16360 Mozilla Foundation Security Advisory 2026-70 CVE: CVE-2026-16360 Product: Firefox ESR Impact: high Fixed in: Firefox ESR 140.13

CVE-2026-16383 Mozilla Foundation Security Advisory 2026-70: CVE-2026-16383 Mozilla Foundation Security Advisory 2026-70 CVE: CVE-2026-16383 Product: Firefox ESR Impact: high Fixed in: Firefox ESR 140.13

CVE-2026-74979 Mozilla Foundation Security Advisory 2026-77: CVE-2026-74979 Mozilla Foundation Security Advisory 2026-77 CVE: CVE-2026-74979 Product: Firefox ESR Impact: high Fixed in: Firefox ESR 153.1

CVE-2017-5456 [CRITICAL] CWE-732 CVE-2017-5456: A mechanism to bypass file system access protections in the sandbox using the file system request co A mechanism to bypass file system access protections in the sandbox using the file system request constructor through an IPC message. This allows for read and write access to the local file system. This vulnerability affects Firefox ESR < 52.1 and Firefox < 53.

CVE-2024-29944 [HIGH] CWE-830 CVE-2024-29944: An attacker was able to inject an event handler into a privileged object that would allow arbitrary An attacker was able to inject an event handler into a privileged object that would allow arbitrary JavaScript execution in the parent process. Note: This vulnerability affects Desktop Firefox only, it does not affect mobile versions of Firefox. This vulnerability affects Firefox < 124.0.1 and Firefox ESR < 115.9.1.

CVE-2015-2733 [CRITICAL] CVE-2015-2733: Use-after-free vulnerability in the CanonicalizeXPCOMParticipant function in Mozilla Firefox before Use-after-free vulnerability in the CanonicalizeXPCOMParticipant function in Mozilla Firefox before 39.0 and Firefox ESR 31.x before 31.8 and 38.x before 38.1 allows remote attackers to execute arbitrary code via vectors involving attachment of an XMLHttpRequest object to a dedicated worker.

CVE-2015-2722 [CRITICAL] CVE-2015-2722: Use-after-free vulnerability in the CanonicalizeXPCOMParticipant function in Mozilla Firefox before Use-after-free vulnerability in the CanonicalizeXPCOMParticipant function in Mozilla Firefox before 39.0 and Firefox ESR 31.x before 31.8 and 38.x before 38.1 allows remote attackers to execute arbitrary code via vectors involving attachment of an XMLHttpRequest object to a shared worker.

CVE-2014-1544 [CRITICAL] CVE-2014-1544: Use-after-free vulnerability in the CERT_DestroyCertificate function in libnss3.so in Mozilla Networ Use-after-free vulnerability in the CERT_DestroyCertificate function in libnss3.so in Mozilla Network Security Services (NSS) 3.x, as used in Firefox before 31.0, Firefox ESR 24.x before 24.7, and Thunderbird before 24.7, allows remote attackers to execute arbitrary code via vectors that trigger certain improper removal of an NSSCertificate structure from a

CVE-2026-8956 [CRITICAL] Mozilla Foundation Security Advisory 2026-48: CVE-2026-8956 Mozilla Foundation Security Advisory 2026-48 CVE: CVE-2026-8956 Product: Firefox ESR Impact: high Fixed in: Firefox ESR 140.11

CVE-2024-8385 [CRITICAL] CWE-843 CVE-2024-8385: A difference in the handling of StructFields and ArrayTypes in WASM could be used to trigger an expl A difference in the handling of StructFields and ArrayTypes in WASM could be used to trigger an exploitable type confusion vulnerability. This vulnerability affects Firefox < 130, Firefox ESR < 128.2, and Thunderbird < 128.2.

CVE-2026-6748 [CRITICAL] Mozilla Foundation Security Advisory 2026-32: CVE-2026-6748 Mozilla Foundation Security Advisory 2026-32 CVE: CVE-2026-6748 Product: Firefox ESR Impact: high Fixed in: Firefox ESR 140.10