Mozilla Firefox vulnerabilities

CVE-2025-4092 [MEDIUM] CWE-119 CVE-2025-4092: Memory safety bugs present in Firefox 137 and Thunderbird 137. Some of these bugs showed evidence of Memory safety bugs present in Firefox 137 and Thunderbird 137. 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 138 and Thunderbird 138.

CVE-2025-4088 [MEDIUM] CWE-352 CVE-2025-4088: A security vulnerability in Thunderbird allowed malicious sites to use redirects to send credentiale A security vulnerability in Thunderbird allowed malicious sites to use redirects to send credentialed requests to arbitrary endpoints on any site that had invoked the Storage Access API. This enabled potential Cross-Site Request Forgery attacks across origins. This vulnerability was fixed in Firefox 138 and Thunderbird 138.

CVE-2025-4087 [MEDIUM] CWE-125 CVE-2025-4087: A vulnerability was identified in Thunderbird where XPath parsing could trigger undefined behavior d A vulnerability was identified in Thunderbird where XPath parsing could trigger undefined behavior due to missing null checks during attribute access. This could lead to out-of-bounds read access and potentially, memory corruption. This vulnerability was fixed in Firefox 138, Firefox ESR 128.10, Thunderbird 138, and Thunderbird 128.10.

CVE-2025-4084 [MEDIUM] CWE-116 CVE-2025-4084: Due to insufficient escaping of the special characters in the "copy as cURL" feature, an attacker co Due to insufficient escaping of the special characters in the "copy as cURL" feature, an attacker could trick a user into using this command, potentially leading to local code execution on the user's system. *This bug only affects Firefox for Windows. Other versions of Firefox are unaffected.*. This vulnerability was fixed in Firefox ESR 128.10, Firef

CVE-2025-4082 [MEDIUM] CWE-125 CVE-2025-4082: Modification of specific WebGL shader attributes could trigger an out-of-bounds read, which, when ch Modification of specific WebGL shader attributes could trigger an out-of-bounds read, which, when chained with other vulnerabilities, could be used to escalate privileges. *This bug only affects Thunderbird for macOS. Other versions of Thunderbird are unaffected.*. This vulnerability was fixed in Firefox 138, Firefox ESR 128.10, Firefox ESR 115.23, Th

CVE-2025-4089 [MEDIUM] CWE-77 CVE-2025-4089: Due to insufficient escaping of special characters in the "copy as cURL" feature, an attacker could Due to insufficient escaping of special characters in the "copy as cURL" feature, an attacker could trick a user into using this command, potentially leading to local code execution on the user's system. This vulnerability was fixed in Firefox 138 and Thunderbird 138.

CVE-2025-4086 [MEDIUM] CWE-451 CVE-2025-4086: A specially crafted filename containing a large number of encoded newline characters could obscure t A specially crafted filename containing a large number of encoded newline characters could obscure the file's extension when displayed in the download dialog. *This bug only affects Thunderbird for Android. Other versions of Thunderbird are unaffected.*. This vulnerability was fixed in Firefox 138 and Thunderbird 138.

CVE-2025-4090 [MEDIUM] CWE-532 CVE-2025-4090: A vulnerability existed in Thunderbird for Android where potentially sensitive library locations wer A vulnerability existed in Thunderbird for Android where potentially sensitive library locations were logged via Logcat. This vulnerability was fixed in Firefox 138 and Thunderbird 138.

CVE-2025-3608 [MEDIUM] CWE-362 CVE-2025-3608: A race condition existed in nsHttpTransaction that could have been exploited to cause memory corrupt A race condition existed in nsHttpTransaction that could have been exploited to cause memory corruption, potentially leading to an exploitable condition. This vulnerability was fixed in Firefox 137.0.2.

CVE-2025-3032 [HIGH] CWE-403 CVE-2025-3032: Leaking of file descriptors from the fork server to web content processes could allow for privilege Leaking of file descriptors from the fork server to web content processes could allow for privilege escalation attacks. This vulnerability was fixed in Firefox 137 and Thunderbird 137.

CVE-2025-3030 [HIGH] CWE-416 CVE-2025-3030: Memory safety bugs present in Firefox 136, Thunderbird 136, Firefox ESR 128.8, and Thunderbird 128.8 Memory safety bugs present in Firefox 136, Thunderbird 136, Firefox ESR 128.8, and Thunderbird 128.8. 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 137, Firefox ESR 128.9, Thunderbird 137, and Thunderbir

CVE-2025-3029 [HIGH] CWE-290 CVE-2025-3029: A crafted URL containing specific Unicode characters could have hidden the true origin of the page, A crafted URL containing specific Unicode characters could have hidden the true origin of the page, resulting in a potential spoofing attack. This vulnerability was fixed in Firefox 137, Firefox ESR 128.9, Thunderbird 137, and Thunderbird 128.9.

CVE-2025-3033 [HIGH] CWE-73 CVE-2025-3033: After selecting a malicious Windows `.url` shortcut from the local filesystem, an unexpected file co After selecting a malicious Windows `.url` shortcut from the local filesystem, an unexpected file could be uploaded. *This bug only affects Firefox on Windows. Other operating systems are unaffected.*. This vulnerability was fixed in Firefox 137 and Thunderbird 137.

CVE-2025-3034 [HIGH] CWE-787 CVE-2025-3034: Memory safety bugs present in Firefox 136 and Thunderbird 136. Some of these bugs showed evidence of Memory safety bugs present in Firefox 136 and Thunderbird 136. 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 137 and Thunderbird 137.

CVE-2025-3028 [MEDIUM] CWE-416 CVE-2025-3028: JavaScript code running while transforming a document with the XSLTProcessor could lead to a use-aft JavaScript code running while transforming a document with the XSLTProcessor could lead to a use-after-free. This vulnerability was fixed in Firefox 137, Firefox ESR 115.22, Firefox ESR 128.9, Thunderbird 137, and Thunderbird 128.9.

CVE-2025-3031 [MEDIUM] CWE-200 CVE-2025-3031: An attacker could read 32 bits of values spilled onto the stack in a JIT compiled function. This vul An attacker could read 32 bits of values spilled onto the stack in a JIT compiled function. This vulnerability was fixed in Firefox 137 and Thunderbird 137.

CVE-2025-3035 [MEDIUM] CWE-359 CVE-2025-3035: By first using the AI chatbot in one tab and later activating it in another tab, the document title By first using the AI chatbot in one tab and later activating it in another tab, the document title of the previous tab would leak into the chat prompt. This vulnerability was fixed in Firefox 137.

CVE-2025-2857 [CRITICAL] CVE-2025-2857: Following the recent Chrome sandbox escape (CVE-2025-2783), various Firefox developers identified a Following the recent Chrome sandbox escape (CVE-2025-2783), various Firefox developers identified a similar pattern in our IPC code. A compromised child process could cause the parent process to return an unintentionally powerful handle, leading to a sandbox escape. The original vulnerability was being exploited in the wild. *This only affects Firefox on Win

CVE-2025-1942 [CRITICAL] CWE-908 CVE-2025-1942: When String.toUpperCase() caused a string to get longer it was possible for uninitialized memory to When String.toUpperCase() caused a string to get longer it was possible for uninitialized memory to be incorporated into the result string. This vulnerability was fixed in Firefox 136 and Thunderbird 136.

CVE-2025-1941 [CRITICAL] CVE-2025-1941: Under certain circumstances, a user opt-in setting that Focus should require authentication before u Under certain circumstances, a user opt-in setting that Focus should require authentication before use could have been be bypassed (distinct from CVE-2025-0245). This vulnerability was fixed in Firefox 136.