Same origin violation: frame calling top.focus() — Mozilla

A child frame can call top.focus even if the framing page comes from a different origin and has overridden the focus routine. The call is made in the context of the child frame. The attacker would look for a target site with a framed page that makes this call but doesn't verify that its parent...

Arbitrary code execution from Firefox sidebar panel II — Mozilla

Sites can use the search target to open links in the Firefox sidebar. Two missing security checks allow malicious scripts to first open a privileged page such as about:config and then inject script using a javascript: url. This could be used to install malicious code or steal data without user...

Autocomplete data leak — Mozilla

As users downarrow through autocomplete choices each is copied in turn into the input control. A malicious site could create a page that autocompletes some common data such as phone number or SSN and potentially convince a user to arrow through the values. Script on the page could watch the value...

Heap overflow possible in UTF8 to Unicode conversion — Mozilla

It is possible for a UTF8 string with invalid sequences to trigger a heap overflow of converted Unicode data. Exploitability would depend on the attackers ability to get the string into the buggy converter. General web content is converted elsewhere but we can't rule out the possibility of a...

Memory overwrite in string library — Mozilla

Daniel de Wildt discovered a memory handling flaw in Mozilla string classes that could overwrite memory at a fixed location if reallocation fails during string growth. This could theoretically lead to arbitrary code execution. Creating the exact conditions for exploitation--including running out ...

SSL "secure site" indicator spoofing — Mozilla

Various schemes were reported that could cause the "secure site" lock icon to appear and show certificate details for the wrong site. These could be used by phishers to make their spoofs look more legitimate, particularly in windows that hide the address bar showing the true location...

Unsafe /tmp/plugtmp directory exploitable to erase user's files — Mozilla

A predictable name is used for the plugin temporary directory. A malicious local user could symlink this to the victim's home directory and wait for the victim to run Firefox. When Firefox shuts down the victim's directory would be erased...

Security Vulnerabilities fixed in Firefox ESR 115.36 — Mozilla

Memory safety bugs present in Firefox ESR 115.35, Firefox ESR 140.10 and Firefox 150. 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...

Security Vulnerabilities fixed in Thunderbird 140.10.2 — Mozilla

Memory safety bugs present in Thunderbird ESR 140.10.1 and Thunderbird 150.0.1. 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...

Security Vulnerabilities fixed in Firefox ESR 140.10.2 — Mozilla

Memory safety bugs present in Firefox ESR 115.35.1, Firefox ESR 140.10.1 and Firefox 150.0.1. 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...

Security Vulnerabilities fixed in Thunderbird 150.0.1 — Mozilla

Memory safety bugs present in Thunderbird ESR 140.10.0 and Thunderbird 150.0.0. 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. Memory safety bugs present in Thunderbird ESR 140.10.0 and...

Security Vulnerabilities fixed in Firefox ESR 115.23.1 — Mozilla

An attacker was able to perform an out-of-bounds read or write on a JavaScript Promise object. An attacker was able to perform an out-of-bounds read or write on a JavaScript object by confusing array index sizes...

Security Vulnerabilities fixed in Thunderbird 128.4 — Mozilla

A permission leak could have occurred from a trusted site to an untrusted site via embed or object elements. An attacker could have caused a use-after-free when accessibility was enabled, leading to a potentially exploitable crash. The origin of an external protocol handler prompt could have been...

Information disclosure via the High Resolution Time API — Mozilla

Security researchers Yossef Oren, Vasileios P. Kemerlis, Simha Sethumadhavan, Angelos D. Keromytis of Columbia University's Network Security Lab reported a method of using the High Resolution Time API for side channel attacks. This attack uses JavaScript loaded through a hostile web page to track...

Firefox 1.0.7 / Mozilla Suite 1.7.12 Vulnerability Fixes — Mozilla

Fixes for multiple vulnerabilities with an overall severity of "critical" have been released in Mozilla Firefox 1.0.7 and the Mozilla Suite 1.7.12 Heap overrun in XBM image processing Critical Crash on "zero-width non-joiner" sequence Critical XMLHttpRequest header spoofing Moderate Object spoofi...

XHTML node spoofing — Mozilla

Parts of the browser UI relied too much on DOM node names without taking different namespaces into account and verifying that nodes really were of the expected type. An XHTML document could be used to create fake elements, for example, with content-defined properties that the browser would access...

Standalone applications can run arbitrary code through the browser — Mozilla

Several media players, for example Flash and QuickTime, support scripted content with the ability to open URLs in the default browser. The default behavior for Firefox was to replace the currently open browser window's content with the externally opened content. If the external URL was a...

Security Vulnerabilities fixed in Thunderbird 140.11 — Mozilla

Memory safety bugs present in Thunderbird 140.10 and Thunderbird 150. 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. Memory safety bugs present in Thunderbird 140.10 and Thunderbird 150...

Security Vulnerabilities fixed in Thunderbird 148 — Mozilla

Memory safety bugs present in Firefox 147 and Thunderbird 147. 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. Memory safety bugs present in Firefox ESR 140.7, Thunderbird ESR 140.7,...

Security Vulnerabilities fixed in Firefox for iOS 144.0 — Mozilla

Unicode RTLO characters could allow malicious websites to spoof filenames in the downloads UI for Firefox for iOS, potentially tricking users into saving files of an unexpected file type...

Security Vulnerabilities fixed in Firefox ESR 115.29 — Mozilla

A compromised web process was able to trigger out of bounds reads and writes in a more privileged process using manipulated WebGL textures. A compromised web process using malicious IPC messages could have caused the privileged browser process to reveal blocks of its memory to the compromised...

Security Vulnerabilities fixed in Firefox ESR 128.11 — Mozilla

A double-free could have occurred in vpxcodecencinitmulti after a failed allocation when initializing the encoder for WebRTC. This could have caused memory corruption and a potentially exploitable crash. Error handling for script execution was incorrectly isolated from web content, which could ha...

Security Vulnerabilities fixed in Firefox ESR 128.9 — Mozilla

JavaScript code running while transforming a document with the XSLTProcessor could lead to a use-after-free. A crafted URL containing specific Unicode characters could have hidden the true origin of the page, resulting in a potential spoofing attack. Memory safety bugs present in Firefox 136,...

Security Vulnerabilities fixed in Thunderbird ESR 128.7 — Mozilla

An attacker could have caused a use-after-free via crafted XSLT data, leading to a potentially exploitable crash. An attacker could have caused a use-after-free via the Custom Highlight API, leading to a potentially exploitable crash. A bug in WebAssembly code generation could have lead to a cras...

Security Vulnerabilities fixed in Firefox 134 — Mozilla

In resizeToAtLeast of SkRegion.cpp, there was a possible out of bounds write due to an integer overflow When redirecting to an invalid protocol scheme, an attacker could spoof the address bar. Note: This issue only affected Android operating systems. Other operating systems are unaffected. Under...

Security Vulnerabilities fixed in Firefox for iOS 133 — Mozilla

Accessing a non-secure HTTP site that uses a non-existent port may cause the SSL padlock icon in the location URL bar to, misleadingly, appear secure. Under certain circumstances, navigating to a webpage would result in the address missing from the location URL bar, making it unclear what the URL...

Security Vulnerabilities fixed in Firefox ESR 115.18 — Mozilla

Certain WebGL operations on Apple silicon M series devices could have lead to an out-of-bounds write and memory corruption due to a flaw in Apple's GPU driver. This bug only affected the application on Apple M series hardware. Other platforms were unaffected. Enhanced Tracking Protection's Strict...

Security Vulnerabilities fixed in Firefox ESR 128.5 — Mozilla

Certain WebGL operations on Apple silicon M series devices could have lead to an out-of-bounds write and memory corruption due to a flaw in Apple's GPU driver. This bug only affected the application on Apple M series hardware. Other platforms were unaffected. An attacker could cause a select...

Script access to .documentURI and .textContent in mail — Mozilla

Mozilla developer Boris Zbarsky reported that a malicious mail message might be able to glean personal information about the recipient from the mailbox URI such as computer account name if the mail recipient has enabled JavaScript in mail. If a malicious mail is forwarded "in-line" to a recipient...

"Wrapped" javascript: urls bypass security checks — Mozilla

Some security checks intended to prevent script injection were incorrect and could be bypassed by wrapping a javascript: url in the view-source: pseudo-protocol. Michael Krax demonstrated that a variant of his favicon exploit could still execute arbitrary code, and the same technique could also b...

Cross-site Scripting through global scope pollution — Mozilla

As you browse from site to site each new page should start with a clean slate. shutdown reports a technique that pollutes the global scope of a window in a way that persists from page to page. A malicious script could define a setter function for a variable known to be used by a popular site, and...

Missing Install object instance checks — Mozilla

The native implementations of InstallTrigger and other XPInstall-related javascript objects did not properly validate that they were called on instances of the correct type. By passing other objects, even raw numbers, the javascript interpreter would jump to the wrong place in memory. Although no...

Download dialog spoofing using Content-Disposition header — Mozilla

Andreas Sandblad of Secunia Research demonstrated a method to spoof the download dialog for saving files by supplying a Content-Disposition header with a different extension than the extension visible in the link and download dialog. Users could be tricked into downloading a safe-looking file suc...

Security Vulnerabilities fixed in Focus for iOS / Klar 151.3.1 — Mozilla

CVE-2026-11799: UXSS in Focus for iOS / Klar Webkit navigation Reporter Renwa Hiwa Impact high References Bug 1975667...

Security Vulnerabilities fixed in Firefox ESR 140.11 — Mozilla

Memory safety bugs present in Firefox ESR 140.10 and Firefox 150. 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. Memory safety bugs present in Firefox ESR 115.35, Firefox ESR 140.10 and...

Security Vulnerabilities fixed in Firefox ESR 115.35.2 — Mozilla

Memory safety bugs present in Firefox ESR 115.35.1, Firefox ESR 140.10.1 and Firefox 150.0.1. 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...

Security Vulnerabilities fixed in Firefox ESR 115.35.1 — Mozilla

Memory safety bugs present in Firefox ESR 115.35.0, Firefox ESR 140.10.0 and Firefox 150.0.0. 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...

Security Vulnerabilities fixed in Firefox 150.0.1 — Mozilla

Memory safety bugs present in Firefox ESR 115.35.0, Firefox ESR 140.10.0 and Firefox 150.0.0. 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. Memory safety bugs present in Firefox ESR...

Security Vulnerabilities fixed in Firefox ESR 140.10 — Mozilla

Memory safety bugs present in Firefox ESR 115.34, Firefox ESR 140.9, Thunderbird ESR 140.9, Firefox 149 and Thunderbird 149. 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. Memory safety...

Security Vulnerabilities fixed in Thunderbird 140.10 — Mozilla

Memory safety bugs present in Firefox ESR 115.34, Firefox ESR 140.9, Thunderbird ESR 140.9, Firefox 149 and Thunderbird 149. 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. Memory safety...

Security Vulnerabilities fixed in Firefox ESR 115.34 — Mozilla

Memory safety bugs present in Firefox ESR 115.33, Firefox ESR 140.8, Thunderbird ESR 140.8, Firefox 148 and Thunderbird 148. 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...

Security Vulnerabilities fixed in Focus for iOS 148.2 — Mozilla

Malicious scripts could display attacker-controlled web content under spoofed domains in Focus for iOS by stalling a self navigation to an invalid port and triggering an iframe redirect, causing the UI to display a trusted domain without user interaction...

Security Vulnerabilities fixed in Firefox ESR 140.8 — Mozilla

Memory safety bugs present in Firefox ESR 140.7, Thunderbird ESR 140.7, Firefox 147 and Thunderbird 147. 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. Memory safety bugs present in...

Security Vulnerabilities fixed in Firefox ESR 115.33 — Mozilla

Memory safety bugs present in Firefox ESR 115.32, Firefox ESR 140.7, Thunderbird ESR 140.7, Firefox 147 and Thunderbird 147. 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...

Security Vulnerabilities fixed in Firefox 141 — Mozilla

On 64-bit platforms IonMonkey-JIT only wrote 32 bits of the 64-bit return value space on the stack. Baseline-JIT, however, read the entire 64 bits. On arm64, a WASM brtable instruction with a lot of entries could lead to the label being too far from the instruction causing truncation and incorrec...

Security vulnerability fixed in Firefox 137.0.2 — Mozilla

A race condition existed in nsHttpTransaction that could have been exploited to cause memory corruption, potentially leading to an exploitable condition...

Security Vulnerabilities fixed in Firefox ESR 128.7 — Mozilla

An attacker could have caused a use-after-free via crafted XSLT data, leading to a potentially exploitable crash. An attacker could have caused a use-after-free via the Custom Highlight API, leading to a potentially exploitable crash. A bug in WebAssembly code generation could have lead to a cras...

Security Vulnerabilities fixed in Thunderbird 132.0.1 — Mozilla

Using remote content in OpenPGP encrypted messages can lead to the disclosure of plaintext...

Security Vulnerabilities fixed in Focus for iOS 132 — Mozilla

Focus was incorrectly allowing internal links to utilize the app scheme used for deeplinking, which could result in links potentially circumventing some URL safety checks...

Mis-issued TURKTRUST certificates — Mozilla

Google reported to Mozilla that TURKTRUST, a certificate authority in Mozilla’s root program, had mis-issued two intermediate certificates to customers. The issue was not specific to Firefox but there was evidence that one of the certificates was used for man-in-the-middle MITM traffic management...