Location bar spoofing vulnerabilities — Mozilla

Security researcher Jonathan Morgan reported that when a page loaded over an insecure protocol, such as http: or file:, sets its document.location to a https: URL which responds with a 204 status and empty response body, the insecure page will receive SSL indicators near the location bar, but wil...

Location bar and SSL indicator spoofing via window.open() on invalid URL — Mozilla

Security researcher Juan Pablo Lopez Yacubian reported that an attacker could call window.open on an invalid URL which looks similar to a legitimate URL and then use document.write to place content within the new document, appearing to have come from the spoofed location. Additionally, if the...

Buffer overflow in http-index-format parser — Mozilla

Justin Schuh of the IBM X-Force reported a flaw in the way Mozilla parses the http-index-format MIME type. By sending a specially crafted 200 header line in the HTTP index response, an attacker can cause the browser to crash and run arbitrary code on the victim's computer...

Crashes with evidence of memory corruption (rv:1.9.0.4/1.8.1.18) — Mozilla

Mozilla developers identified and fixed several stability bugs in the browser engine used in Firefox and other Mozilla-based products. Some of these crashes showed evidence of memory corruption under certain circumstances and we presume that with enough effort at least some of these could be...

nsXMLDocument::OnChannelRedirect() same-origin violation — Mozilla

Mozilla security researcher mozbugra4 reported that the same-origin check in nsXMLDocument::OnChannelRedirect could be bypassed. This vulnerability could be used to execute JavaScript in the context of a different website...

HTTP Referrer spoofing with malformed URLs — Mozilla

Security researcher Gregory Fleischer demonstrated a problem with the HTTP Referer: sic header sent with requests to URLs containing Basic Authentication credentials with empty usernames. In these cases a number of leading characters, based on the length of the password in the URL, are removed fr...

XSS using addEventListener — Mozilla

Mozilla contributor mozbugra4 demonstrated that the addEventListener method could be used to inject script into another site in violation of the browser's same-origin policy. This could be used to access or modify private or valuable information from that other site...

UniversalBrowserRead privilege escalation — Mozilla

shutdown reports that scripts granted the UniversalBrowserRead privilege can leverage that into the equivalent of the far more powerful UniversalXPConnect since they are allowed to "read" into a privileged context. This allows the attacker the ability to run scripts with the full privilege of the...

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 Firefox 145 — Mozilla

Memory safety bugs present in Firefox 144 and Thunderbird 144. 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 144.0.2 — Mozilla

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...

Security Vulnerabilities fixed in Firefox for iOS 136 — Mozilla

Malicious websites utilizing a server-side redirect to an internal error page could result in a spoofed website URL Websites redirecting to a non-HTTP scheme URL could allow a website address to be spoofed for a malicious page Scanning certain QR codes that included text with a website URL could...

Security Vulnerabilities fixed in Firefox for iOS 134 — Mozilla

Opening Javascript links in a new tab via long-press in the Firefox iOS client could result in a malicious script spoofing the URL of the new tab. Long hostnames in URLs could be leveraged to obscure the actual host of the website or spoof the website address...

Security Vulnerabilities fixed in Focus for iOS 122 — Mozilla

Using a javascript: URI with a setTimeout race condition, an attacker can execute unauthorized scripts on top origin sites in urlbar. This bypasses security measures, potentially leading to arbitrary code execution or unauthorized actions within the user's loaded webpage. An attacker could execut...

Security Vulnerabilities fixed in Firefox ESR 115.6 — Mozilla

The WebGL DrawElementsInstanced method was susceptible to a heap buffer overflow when used on systems with the Mesa VM driver. This issue could allow an attacker to perform remote code execution and sandbox escape. EncryptingOutputStream was susceptible to exposing uninitialized data. This issue...

Security Vulnerabilities fixed in Firefox for iOS 119 — Mozilla

When opening a page in reader mode, the redirect URL could have caused attacker-controlled script to execute in a reflected Cross-Site Scripting XSS attack...

Security Vulnerabilities fixed in Firefox for iOS 34 — Mozilla

When a download was initiated, the client did not check whether it was in normal or private browsing mode, which led to private mode cookies being shared in normal browsing mode...

Arbitrary file manipulation by local user through Mozilla updater and callback application path parameter — Mozilla

Security researcher Holger Fuhrmannek reported that when the Updater is opened directly using the callback application path parameter, a copy of a user specified file is made as a callback file. If the target of this file is made with a locked hardlink, an arbitrary local file can be replaced on...

Use-after-free deleting tables from a contenteditable document — Mozilla

Security researcher firehack used the Address Sanitizer tool to discover a use-after-free in contenteditable mode. This occurs when deleting document object model DOM table elements created within the editor and results in a potentially exploitable crash...

WebRTC and LibVPX vulnerabilities found through code inspection — Mozilla

Security researcher Ronald Crane reported five "moderate" rated vulnerabilities affecting released code that were found through code inspection. These included the following issues in WebRTC: an integer underflow, a missing status check, race condition, and a use of deleted pointers to create new...

HTML injection in homescreen app bypassing DOM sanitizer — Mozilla

Mozilla fixed a bug in the l10n localization of the default homescreen app of Firefox OS reported by security researcher Muneaki Nishimura. Exploiting this issue requires tricking the user into bookmarking a specially crafted web page via the 'Add to home screen' functionality. As a result, an...

Miscellaneous memory safety hazards (rv:35.0 / rv:31.4) — Mozilla

Mozilla developers and community identified and fixed several memory safety bugs in the browser engine used in Firefox and other Mozilla-based products. Some of these bugs showed evidence of memory corruption under certain circumstances, and we presume that with enough effort at least some of the...

Profile directory file access through file: protocol — Mozilla

Security researcher Yu Dongsong reported on Firefox for Android that a file: protocol hyperlink could link to a local file in the Firefox profile directory, bypassing access restrictions. This issue was previously addressed in Mozilla Foundation Security Advisory 2014-33 but not completely...

Use-after-free with select element — Mozilla

Security researcher Scott Bell used the Address Sanitizer tool to discover a use-after-free when using a element in a form after it has been destroyed. This could lead to a potentially exploitable crash...

Memory corruption while rendering grayscale PNG images — Mozilla

Mozilla community member Tobias Schula reported that if gfx.colormanagement.enablev4 preference is enabled manually in about:config, some grayscale PNG images will be rendered incorrectly and cause memory corruption during PNG decoding when certain color profiles are in use. A crafted PNG image...

Potentially exploitable crash in the YARR regular expression library — Mozilla

Security researcher Aki Helin reported a crash in the YARR regular expression library that could be triggered by javascript in web content...

Dangling pointer vulnerability using DOM plugin array — Mozilla

Security researcher Sergey Glazunov reported a dangling pointer vulnerability in the implementation of navigator.plugins in which the navigator object could retain a pointer to the plugins array even after it had been destroyed. An attacker could potentially use this issue to crash the browser an...

Heap buffer overflow in string to number conversion — Mozilla

Security researcher Alin Rad Pop of Secunia Research reported a heap-based buffer overflow in Mozilla's string to floating point number conversion routines. Using this vulnerability an attacker could craft some malicious JavaScript code containing a very long string to be converted to a floating...

Arbitrary domain cookie access by local file: resources — Mozilla

Security researcher Gregory Fleischer reported that local resources loaded via the file: protocol can access any domain's cookies which have been saved on a user's machine. Fleischer demonstrated that a local document's domain was being calculated incorrectly from its URL. If a victim could be...

Errors parsing URLs with leading whitespace and control characters — Mozilla

Perl developer Chip Salzenberg reported that certain control characters, when placed at the beginning of a URL, would lead to incorrect parsing resulting in a malformed URL being output by the parser. IBM researchers Justin Schuh, Tom Cross, and Peter William also reported a related symptom as pa...

-moz-binding property bypasses security checks on codebase principals — Mozilla

Security researcher Collin Jackson reported that the -moz-binding CSS property can be used to bypass security checks which validate codebase principals. Similar to the issue reported in MFSA 2008-23, Jackson demonstrated that an attacker can replace a stylesheet in a signed JAR which uses relativ...

Parsing error in E4X default namespace — Mozilla

Security researcher Chris Evans reported an error in the method used to parse the default namespace in an E4X document. The error was caused by quote characters in the namespace not being properly escaped. The severity of this issue was determined to be low...

Crashes with evidence of memory corruption (rv:1.9.0.2/1.8.1.17) — Mozilla

Mozilla developers identified and fixed several stability bugs in the browser engine used in Firefox and other Mozilla-based products. Some of these crashes showed evidence of memory corruption under certain circumstances and we presume that with enough effort at least some of these could be...

Web browsing history and forward navigation stealing — Mozilla

Mozilla contributor David Bloom reported a vulnerability in the way images are treated by the browser when a user leaves a page which utilizes designMode frames. The reported issue can be used to steal a user's navigation history, forward navigation information, and crash the user's browser. The...

Unescaped URIs passed to external programs — Mozilla

Jesper Johansson pointed out that Mozilla did not percent-encode spaces and double-quotes in URIs handed off to external programs for handling, which can cause the receiving program to mistakenly interpret a single URI as multiple arguments. The danger depends on the arguments supported by the...

JavaScript engine vulnerabilities — Mozilla

Continuing our security audit of the JavaScript engine, Mozilla developers found and fixed several potential vulnerabilities...

"View Image" local resource linking (Windows) — Mozilla

Normally Mozilla-based clients prevent web content from linking to local files but Eric Foley reports a partial bypass of this restriction by using Windows filename syntax on a Windows computer rather than a file:/// URL as the SRC= attribute. The image will not be loaded on the web page--it will...

Mail Multiple Information Disclosure — Mozilla

As a privacy measure to prevent senders primarily spammers from tracking when e-mail is read Thunderbird does not load remote content referenced from an HTML mail message until a user tells it to do so. This normally includes the content of frames and CSS files, but CrashFr showed it was possible...

Accessing XBL compilation scope via valueOf.call() — Mozilla

mozbugra4 discovered that the compilation scope of privileged built-in XBL bindings was not fully protected from web content and could be accessed by calling valueOf.call and valueOf.apply on a method of that binding. This could then be used to compile and run attacker-supplied JavaScript, giving...

JavaScript garbage-collection hazards — Mozilla

Garbage collection hazards have been found in the JavaScript engine where some routines used temporary variables that were not properly protected rooted. Specially crafted objects could contain a user-defined method that would be called during the lifetime of these temporaries. If this method...

Security Vulnerabilities fixed in Firefox 144 — Mozilla

Use-after-free in MediaTrackGraphImpl::GetInstance 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...

Security Vulnerabilities fixed in Firefox 143.0.3 — Mozilla

CVE-2025-11152: Sandbox escape due to integer overflow in the Graphics: Canvas2D component Reporter Oskar L Impact high References Bug 1987246 CVE-2025-11153: JIT miscompilation in the JavaScript Engine: JIT component Reporter Nan Wang Impact high References Bug 1987481...

Security Vulnerability fixed in Thunderbird 131.0.1, Thunderbird 128.3.1, Thunderbird 115.16.0 — Mozilla

An attacker was able to achieve code execution in the content process by exploiting a use-after-free in Animation timelines. We have had reports of this vulnerability being exploited in the wild...

Security Vulnerabilities fixed in Firefox ESR 115.15 — Mozilla

A potentially exploitable type confusion could be triggered when looking up a property name on an object being used as the with environment. Internal browser event interfaces were exposed to web content when privileged EventHandler listener callbacks ran for those events. Web content that tried t...

Security Vulnerabilities fixed in Firefox ESR 115.14 — Mozilla

Insufficient checks when processing graphics shared memory could have led to memory corruption. This could be leveraged by an attacker to perform a sandbox escape. Incomplete WebAssembly exception handing could have led to a use-after-free. Editor code failed to check an attribute value. This cou...

Security Issues fixed in Mozilla VPN for Linux v2.16.1 — Mozilla

An invalid Polkit Authentication check and missing authentication requirements for D-Bus methods allowed any local user to configure arbitrary VPN setups.This bug only affects Mozilla VPN on Linux. Other operating systems are unaffected...

Security Vulnerabilities fixed in Firefox ESR 102.13 — Mozilla

An attacker could have triggered a use-after-free condition when creating a WebRTC connection over HTTPS. Cross-compartment wrappers wrapping a scripted proxy could have caused objects from other compartments to be stored in the main compartment resulting in a use-after-free. A website could have...

Mozilla VPN local privilege escalation vis uncontrolled OpenSSL search path — Mozilla

Mozilla VPN can load an OpenSSL configuration file from an unsecured directory. A user or attacker with limited privileges could leverage this to launch arbitrary code with SYSTEM privilege...

Insecure Sharing of HTML/JS Files in Hubs Cloud Reticulum — Mozilla

Hubs Cloud allows users to download shared content, specifically HTML and JS, which could allow javascript execution in the Hub Cloud instance’s primary hosting domain...

Use-after-free when using alt key and toplevel menus — Mozilla

Security researcher Abhishek Arya Inferno of the Google Chrome Security Team reported a use-after-free vulnerability when the alt key is used in conjunction with toplevel menu items in Firefox. This results in a potentially exploitable crash when triggered. This vulnerability is mitigated by not...