evalInSanbox location context incorrectly applied — Mozilla

Mozilla security researcher mozbugra4 reported that if code executed by the evalInSandbox function sets location.href, it can get the wrong subject principal for the URL check, ignoring the sandbox's Javascript context and gaining the context of evalInSandbox object. This can lead to malicious we...

Frames can shadow top.location — Mozilla

Security researcher Mariusz Mlynski reported that the location property can be accessed by binary plugins through top.location with a frame whose name attribute's value is set to "top". This can allow for possible cross-site scripting XSS attacks through plugins...

Miscellaneous memory safety hazards (rv:16.0.1) — Mozilla

Mozilla developers identified and fixed two top crashing bugs in the browser engine used in Firefox and other Mozilla-based products. These bugs showed evidence of memory corruption under certain circumstances, and we presume that with enough effort at least some of these could be exploited to ru...

DOMParser loads linked resources in extensions when parsing text/html — Mozilla

Security researcher vsemozhetbyt reported that when the DOMParser is used to parse text/html data in a Firefox extension, linked resources within this HTML data will be loaded. If the data being parsed in the extension is untrusted, it could lead to information leakage and can potentially be...

Integer overflow and arbitrary code execution in Array.reduceRight() — Mozilla

Security researchers Chris Rohlf and Yan Ivnitskiy of Matasano Security reported that when a JavaScript Array object had its length set to an extremely large value, the iteration of array elements that occurs when its reduceRight method was subsequently called could result in the execution of...

Miscellaneous memory safety hazards (rv:3.0/1.9.2.18) — Mozilla

Mozilla developers 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 these could be...

Incomplete fix for CVE-2010-0179 — Mozilla

Mozilla security researcher mozbugra4 reported that the fix for CVE-2010-0179 could be circumvented permitting the execution of arbitrary JavaScript with chrome privileges...

nsTreeSelection dangling pointer remote code execution vulnerability — Mozilla

Security researcher regenrecht reported via TippingPoint's Zero Day Initiative an integer overflow vulnerability in the implementation of the XUL element's selection attribute. When the size of a new selection is sufficiently large the integer used in calculating the length of the selection can...

Crashes with evidence of memory corruption (rv:1.9.2.4/ 1.9.1.10) — 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...

XSS due to window.dialogArguments being readable cross-domain — Mozilla

Security researcher Hidetake Jo of Microsoft Vulnerability Research reported that the properties set on an object passed to showModalDialog were readable by the document contained in the dialog, even when the document was from a different domain. This is a violation of the same-origin policy and...

JavaScript chrome privilege escalation — Mozilla

Mozilla security researcher mozbugra4 reported a vulnerability which allows scripts from page content to run with elevated privileges. Using this vulnerability, an attacker could cause a chrome privileged object, such as the browser sidebar or the FeedWriter, to interact with web content in such ...

Crash and remote code execution in block reflow — Mozilla

Security research firm Astabis reported a vulnerability in Firefox 2 submitted through the iSIGHT Partners GVP Program by Greg McManus, Primary GVP Researcher. The reported crash in Mozilla's block reflow code could be used by an attacker to crash the browser and run arbitrary code on the victim'...

Crashes with evidence of memory corruption (rv:1.8.0.9/1.8.1.1) — Mozilla

As part of the Firefox 2.0.0.1 and 1.5.0.9 update releases we fixed several bugs to improve the stability of the product. Some of these were crashes that showed evidence of memory corruption and we presume that at least some of these could be exploited to run arbitrary code with enough effort...

Code execution through deleted frame reference — Mozilla

Thilo Girmann discovered that in certain circumstances a JavaScript reference to a frame or window was not properly cleared when the referenced content went away, and he demonstrated that this pointer to a deleted object could be used to execute native code supplied by the attacker...

JavaScript garbage-collection hazard audit — Mozilla

Igor Bukanov has audited the JavaScript engine for routines that use temporary variables not protected against garbage-collection. If malicious content could cause garbage-collection to run during the lifetime of these temporaries then the original routine would end up operating on freed memory...

Security Vulnerability fixed in Firefox 136.0.4, Firefox ESR 128.8.1, Firefox ESR 115.21.1 — Mozilla

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...

Security Vulnerabilities fixed in Thunderbird 131 — Mozilla

A compromised content process could have allowed for the arbitrary loading of cross-origin pages. An attacker could, via a specially crafted multipart response, execute arbitrary JavaScript under the resource://pdf.js origin. This could allow them to access cross-origin PDF content. This access i...

Security Vulnerabilities fixed in Firefox ESR 102.2 — Mozilla

An attacker could have abused XSLT error handling to associate attacker-controlled content with another origin which was displayed in the address bar. This could have been used to fool the user into submitting data intended for the spoofed origin. A cross-origin iframe referencing an XSLT documen...

Security Vulnerabilities fixed in Thunderbird 78.5.1 — Mozilla

When reading SMTP server status codes, Thunderbird writes an integer value to a position on the stack that is intended to contain just one byte. Depending on processor architecture and stack layout, this leads to stack corruption that may be exploitable...

Addressbar spoofing with right-to-left characters on Firefox for Android — Mozilla

Security researcher Rafay Baloch reported a mechanism to spoof the addressbar in Firefox for Android using right-to-left character sets when combined with left-to-right characters. This can be used to cause only certain portions of the loaded left-to-right character portion of the URL to be...

Stack underflow during 2D graphics rendering — Mozilla

Georg Koppen of the Tor Project used the Address Sanitizer tool to discover a stack buffer underflow when calculating clipping regions in 2D graphics. This results in a potentially exploitable crash...

Miscellaneous memory safety hazards (rv:47.0 / rv:45.2) — Mozilla

Mozilla developers and community members reported 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 these...

Write to invalid HashMap entry through JavaScript.watch() — Mozilla

The CESG, the Information Security Arm of GCHQ, reported that the JavaScript .watch method could be used to overflow the 32-bit generation count of the underlying HashMap, resulting in a write to an invalid entry. Under the right conditions this write could lead to arbitrary code execution. The...

Memory corruption with malicious NPAPI plugin — Mozilla

The CESG, the Information Security Arm of GCHQ, reported a dangling pointer dereference within the Netscape Plugin Application Programming Interface NPAPI that could lead to the NPAPI subsystem crashing. This issue requires a maliciously crafted NPAPI plugin in concert with scripted web content,...

Addressbar spoofing though history navigation and Location protocol property — Mozilla

Security researcher Tsubasa Iinuma reported a mechanism where the displayed addressbar can be spoofed to users. This issue involves using history navigation in concert with the Location protocol property. After navigating from a malicious page to another, if the user navigates back to the initial...

Addressbar spoofing attacks — Mozilla

Security researcher Jordi Chancel reported two issues involving addressbar spoofing...

Hash in data URI is incorrectly parsed — Mozilla

Security researcher Abdulrahman Alqabandi reported that when a data: URI is parsed, the hash '' symbol is incorrectly handled, allowing for spoofing attacks. This issue could result in the wrong URI being displayed as a location, which can mislead users to believe they are on a different site tha...

Buffer overflow during image interactions in canvas — Mozilla

Security researcher Looben Yang reported a buffer overflow in the JPEGEncoder function during script interactions with a canvas element. This is caused by a race condition and incorrectly matched sizes following image interactions. This leads to a potentially exploitable crash...

Memory safety errors in libGLES in the ANGLE graphics library — Mozilla

Security researcher Ronald Crane reported two issues in the libGLES portions of the ANGLE graphics library, used for WebGL and OpenGL content on Windows systems. The first of these is a missing bounds check leading to memory safety errors when manipulating shaders which could result in the writin...

Errors in the handling of CORS preflight request headers — Mozilla

Mozilla developer Ehsan Akhgari reported two issues with Cross-origin resource sharing CORS "preflight" requests...

Crash when using debugger with SavedStacks in JavaScript — Mozilla

Security researcher Spandan Veggalam reported a crash while using the debugger API with SavedStacks in JavaScript. This crash can only occurs when the debugger is in use but may be potentially exploitable...

Privilege escalation through SVG navigation — Mozilla

Security researcher Mariusz Mlynski reported, through HP Zero Day Initiative's Pwn2Own contest, a method to run arbitrary scripts in a privileged context. This bypassed the same-origin policy protections by using a flaw in the processing of SVG format content navigation...

Malicious WebGL content crash when writing strings — Mozilla

Security researcher Daniele Di Proietto discovered that when WebGL content crafted in a specific manner wrote strings, it would cause a crash when this content was run...

Use-after-free with FireOnStateChange event — Mozilla

Security researcher Jethro Beekman of the University of California, Berkeley reported a crash when the FireOnStateChange event is triggered in some circumstances. This leads to a use-after-free and a potentially exploitable crash when it occurs...

onbeforeunload and Javascript navigation DOS — Mozilla

Security researchers Tim Philipp Schäfers and Sebastian Neef, the team of Internetwache.org, reported a mechanism using JavaScript onbeforeunload events with page navigation to prevent users from closing a malicious page's tab and causing the browser to become unresponsive. This allows for a deni...

Character encoding cross-origin XSS attack — Mozilla

Security researcher Masato Kinugawa discovered that if a web page is missing character set encoding information it can inherit character encodings across navigations into another domain from an earlier site. Only same-origin inheritance is allowed according to the HTML5 specification. This issue...

Memory corruption found using Address Sanitizer — Mozilla

Security researcher Abhishek Arya Inferno of the Google Chrome Security Team used the Address Sanitizer tool to discover a series of use-after-free problems rated critical as security issues in shipped software. Some of these issues are potentially exploitable, allowing for remote code execution...

X-Frame-Options ignored when using server push with multi-part responses — Mozilla

Bugzilla developer Frédéric Buclin reported that the X-Frame-Options header is ignored when server push is used in multi-part responses. This can lead to potential clickjacking on sites that use X-Frame-Options as a protection...

Privileged access for content level constructor — Mozilla

Security researcher Cody Crews reported a method to call a content level constructor that allows for this constructor to have chrome privileged access. This affects chrome object wrappers COW and allows for write actions on objects when only read actions should be allowed. This can lead to...

Privilege escalation through Mozilla Maintenance Service — Mozilla

Security researcher Frédéric Hoguin discovered that the Mozilla Maintenance Service on Windows was vulnerable to a buffer overflow. This system is used to update software without invoking the User Account Control UAC prompt. The Mozilla Maintenance Service is configured to allow unprivileged user...

Out-of-bounds write in Cairo library — Mozilla

Security researcher Abhishek Arya Inferno of the Google Chrome Security Team used the Address Sanitizer tool to discover an out-of-bounds write in Cairo graphics library. When certain values are passed to it during rendering, Cairo attempts to use negative boundaries or sizes for boxes, leading t...

Out-of-bounds read in image rendering — Mozilla

Using the Address Sanitizer tool, security researcher Atte Kettunen from OUSPG found an out-of-bounds read while rendering GIF format images. This could cause a non-exploitable crash and could also attempt to render normally inaccessible data as part of the image...

Ambiguous IPv6 in Origin headers may bypass webserver access restrictions — Mozilla

Security researcher Simone Fabiano reported that if a cross-site XHR or WebSocket is opened on a web server on a non-standard port for web traffic while using an IPv6 address, the browser will send an ambiguous origin headers if the IPv6 address contains at least 2 consecutive 16-bit fields of...

Miscellaneous memory safety hazards (rv:8.0) — Mozilla

Mozilla developers 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 these could be exploited to run...

Recursive eval call causes confirm dialogs to evaluate to true — Mozilla

Security researcher Zach Hoffman reported that a recursive call to eval wrapped in a try/catch statement places the browser into a inconsistent state. Any dialog box opened in this state is displayed without text and with non-functioning buttons. Closing the window causes the dialog to evaluate t...

Integer overflow vulnerability in NewIdArray — Mozilla

Security researcher regenrecht reported via TippingPoint's Zero Day Initiative that JavaScript arrays were vulnerable to an integer overflow vulnerability. The report demonstrated that an array could be constructed containing a very large number of items such that when memory was allocated to sto...

Content-Disposition: attachment ignored if Content-Type: multipart also present — Mozilla

Security researcher Ilja van Sprundel of IOActive reported that the Content-Disposition: attachment HTTP header was ignored when Content-Type: multipart was also present. This issue could potentially lead to XSS problems in sites that allow users to upload arbitrary files and specify a Content-Ty...

Arbitrary code execution with Firebug XMLHttpRequestSpy — Mozilla

Mozilla security researcher mozbugra4 reported that the XMLHttpRequestSpy module in the Firebug add-on was exposing an underlying chrome privilege escalation vulnerability. When the XMLHttpRequestSpy object was created, it would attach various properties of itself to objects defined in web conten...

Upgrade media libraries to fix memory safety bugs — Mozilla

Mozilla upgraded several third party libraries used in media rendering to address multiple memory safety and stability bugs identified by members of the Mozilla community. Some of the bugs discovered could potentially be used by an attacker to crash a victim's browser and execute arbitrary code o...

Insufficient warning for PKCS11 module installation and removal — Mozilla

Mozilla security researcher Jesse Ruderman reported that when security modules were added or removed via pkcs11.addmodule or pkcs11.deletemodule, the resulting dialog was not sufficiently informative. Without sufficient warning, an attacker could entice a victim to install a malicious PKCS11 modu...