RSA Signature Forgery (variant) — Mozilla

MFSA 2006-60 reported that RSA digital signatures with a low exponent typically 3 could be forged. This flaw was corrected in the Mozilla Network Security Services NSS library version 3.11.3 used by Firefox 2.0 and current development versions of Mozilla clients...

Privilege escalation using addSelectionListener — Mozilla

Web content could access the nsISelectionPrivate interface of the Selection object and use it to add a SelectionListener. The listener would be called when the user did a "Find" on the page or a "select all", and as intended this shouldn't cause any problems. But as with escaping the PAC sandbox ...

HTTP response smuggling — Mozilla

Kazuho Oku of Cybozu Labs reports via the Information-technology Promotion Agency, Japan, that Firefox is vulnerable to HTTP response smuggling when used with certain proxy servers...

Privilege escalation using a JavaScript function's cloned parent — Mozilla

shutdown discovered it was possible to use the Object.watch method to access an internal function object the "clone parent" which could then be used to run arbitrary JavaScript code with full permission. This could be used to install malware such as password sniffers or viruses...

Code execution through shared function objects — Mozilla

Improper cloning of base objects allowed web content scripts to walk up the prototype chain to get to a privileged object. This could be used to execute code with enhanced privileges...

Security Vulnerabilities fixed in Firefox 138.0.4 — 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 128.2 — Mozilla

When aborting the verification of an OTR chat session, an attacker could have caused a use-after-free bug leading to a potentially exploitable crash. A difference in the handling of StructFields and ArrayTypes in WASM could be used to trigger an exploitable type confusion vulnerability. A...

Security Vulnerabilities fixed in Thunderbird 115.4.1 — Mozilla

It was possible for certain browser prompts and dialogs to be activated or dismissed unintentionally by the user due to an insufficient activation-delay. An attacker could have created a malicious link using bidirectional characters to spoof the location in the address bar when visited. Drivers a...

Insecure Proxy Configuration in Hubs Cloud Reticulum — Mozilla

Proxy functionality built into Hubs Cloud’s Reticulum software allowed access to internal URLs, including the metadata service...

Security Vulnerabilities fixed in Firefox for iOS 27 — Mozilla

IndexedDB should be cleared when leaving private browsing mode and it is not, the API for WKWebViewConfiguration was being used incorrectly and requires the private instance of this object be deleted when leaving private mode...

JavaScript immutable property enforcement can be bypassed — Mozilla

Mozilla developer Jeff Walden reported that in Gecko's implementation of ECMAScript 5 API's enforces non-configurable properties with logic specific to each API. Scripts that do not go through these APIs can bypass these protections and make changes to the immutable properties in violation of...

Remote HTML tag injection in Gaia System app — Mozilla

Security researcher Muneaki Nishimura reported an issue with Gaia's System app which allows an attacker to inject HTML code into the System app's context via specially-crafted search links. The injection occurs when the user opens such malicious link in the browser and then presses the HOME butto...

Information stealing via form history — Mozilla

Security researcher Paul Stone reported that a Java applet could be used to mimic interaction with form autocomplete controls and steal entries from the form history...

Buffer overflow in JavaScript atom map — Mozilla

Security researcher Christian Holler reported that the JavaScript engine's internal mapping of string values contained an error in cases where the number of values being stored was above 64K. In such cases an offset pointer was manually moved forwards and backwards to access the larger address...

Scriptable plugin execution in SeaMonkey mail — Mozilla

Security researcher Georgi Guninski reported that scriptable plugin content, such as Flash objects, could be loaded and executed in SeaMonkey mail messages by embedding the content in an iframe inside the message. If a user were to reply to or forward such a message, malicious JavaScript embedded...

Chrome privilege escalation with FeedWriter — Mozilla

Mozilla security researcher mozbugra4 reported that the BrowserFeedWriter could be leveraged to run JavaScript code from web content with elevated privileges. Using this vulnerability, an attacker could construct an object containing malicious JavaScript and cause the FeedWriter to process the...

Information stealing via local shortcut files — Mozilla

Security researcher Liu Die Yu of TopsecTianRongXin reported that locally saved .url shortcut files could be used to read information stored in the local cache. An attacker could use this vulnerability to steal information from a victim's browser cache if they were able to get the victim to...

Arbitrary file upload via originalTarget and DOM Range — Mozilla

Opera Software reported a vulnerability which allows malicious content to force the browser into uploading local files to the remote server. This could be used by an attacker to steal files from known locations on a victim's computer...

Faulty .properties file results in uninitialized memory being used — Mozilla

Mozilla developer Daniel Glazman demonstrated that an improperly encoded .properties file in an add-on can result in uninitialized memory being used. This could potentially result in small chunks of data formerly used by other programs being exposed to the add-on code. If the localized string wer...

onUnload Tailgating — Mozilla

Michal Zalewski demonstrated that onUnload event handlers had access to the address of the new page about to be loaded, even if the navigation was triggered from outside the page content such as by using a bookmark, pressing the back button, or typing an address into the location bar. If the...

Crashes with evidence of memory corruption (rv:1.8.0.10/1.8.1.2) — Mozilla

As part of the Firefox 2.0.0.2 and 1.5.0.10 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 with enough effort at least some of these could be exploited to run arbitrary code...

JavaScript Regular Expression Heap Corruption — Mozilla

Priit Laes reported a crash due to a heap buffer overflow triggered by a JavaScript regular expression containing a minimal quantifier. We presume this could be exploited to run arbitrary code...

PAC privilege escalation using Function.prototype.call — Mozilla

mozbugra4 reports that a malicious Proxy AutoConfig PAC server could serve a PAC script that can execute code with elevated privileges by setting the required FindProxyForURL function to the eval method on a privileged object that leaked into the PAC sandbox. By redirecting the victim to a...

Double-free on malformed VCard — Mozilla

Masatoshi Kimura reported a hang caused by a double-free in Thunderbird when processing a large VCard with invalid base64 characters in it. Since an attacker can supply an arbitrary amount of well-formed VCard data before introducing the error we presume this could be exploited to run code of the...

Deleted object reference when designMode="on" — Mozilla

Martijn Wargers and Nick Mott each described crashes that were discovered to ultimately stem from the same root cause: attempting to use a deleted controller context when designMode was turned on. This generally results in crashing the browser, but in theory references to deleted objects can be...

Security Vulnerabilities fixed in Firefox ESR 115.35 — 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...

Security Vulnerabilities fixed in Firefox 135 — 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. The fullscreen notification is prematurely hidden when...

Security Vulnerabilities fixed in Thunderbird 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 Vulnerabilities fixed in Firefox ESR 115.13 — Mozilla

An error in the ECMA-262 specification relating to Async Generators could have resulted in a type confusion, potentially leading to memory corruption and an exploitable crash. Due to large allocation checks in Angle for GLSL shaders being too lenient an out-of-bounds access could occur when...

Reading sensitive profile files through local HTML file on Android — Mozilla

Security researcher Jordi Chancel reported an issue in Firefox for Android where a locally saved HTML file could use file: URIs to trigger the download of additional files or opening of cached profile data without user awareness...

Memory corruption during text run construction (Windows) — Mozilla

Alex Miller reported that when very long strings were constructed and inserted into an HTML document, the browser would incorrectly construct the layout objects used to display the text. Under such conditions an incorrect length would be calculated for a text run resulting in too small of a memor...

Multiple location bar spoofing vulnerabilities — Mozilla

Google security researcher Michal Zalewski reported two methods for spoofing the contents of the location bar. The first method works by opening a new window containing a resource that responds with an HTTP 204 no content and then using the reference to the new window to insert HTML content into...

Heap overflow in certificate regexp parsing — Mozilla

Moxie Marlinspike reported a heap overflow vulnerability in the code that handles regular expressions in certificate names. This vulnerability could be used to compromise the browser and run arbitrary code by presenting a specially crafted certificate to the client. This code provided compatibili...

setTimeout loses XPCNativeWrappers — Mozilla

Mozilla developer Blake Kaplan reported that setTimeout, when called with certain object parameters which should be protected with a XPCNativeWrapper, will fail to keep the object wrapped when compiling the new function to be executed. If chrome privileged code were to call setTimeout using this ...

Incorrect principal set for file: resources loaded via location bar — Mozilla

Security researchers Adam Barth and Collin Jackson reported that when a file: resource is loaded via the location bar it inherits the principal of the previously loaded document. This vulnerability can potentially give the newly loaded document additional privileges to access the contents of othe...

POST data sent to wrong site when saving web page with embedded frame — Mozilla

Developer and Mozilla community member Paolo Amadini reported that when saving the inner frame of a web page as a file when the outer page has POST data associated with it, the POST data will be incorrectly sent to the URL of the inner frame. This could potentially result in a user's sensitive da...

nsXMLHttpRequest::NotifyEventListeners() same-origin violation — Mozilla

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

XSS through JavaScript same-origin violation — Mozilla

Mozilla contributor mozbugra4 submitted a set of vulnerabilities which allow scripts from one document to be executed in the context of a different document. These vulnerabilities could be used by an attacker to violate the same-origin policy and perform an XSS attack against arbitrary sites,...

Multiple XSS vulnerabilities from character encoding — Mozilla

WebKit developer Alexey Proskuryakov reported that the Mozilla HTML parser treated the backspace character as whitespace contrary to the HTML specification and different from other browsers. This difference might lead to Cross-site Scripting XSS risks on sites which filtered input in accordance...

Multiple file input focus stealing vulnerabilities — Mozilla

Security researchers hong and Gregory Fleischer each reported a variant on earlier reported bugs regarding focus shifting in file input controls. Their variants used file input controls nested inside tags to take advantage of automatic focus shifting into the file input field noted on the Hacker...

Crashes with evidence of memory corruption (rv:1.8.1.8) — Mozilla

As part of the Firefox 2.0.0.8 update releases Mozilla developers fixed many bugs to improve the stability of the product. 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 exploited to run...

Privilege escallation using an event handler attached to an element not in the document — Mozilla

An attacker can use an element outside of a document to call an event handler allowing content to run arbitrary code with chrome privileges...

Crashes with evidence of memory corruption (rv:1.8.0.12/1.8.1.4) — Mozilla

As part of the Firefox 2.0.0.4 and 1.5.0.12 update releases Mozilla developers fixed many bugs to improve the stability of the product. Some of these crashes that showed evidence of memory corruption under certain circumstances and we presume that with enough effort at least some of these could b...

Javascript navigator Object Vulnerability — Mozilla

An anonymous researcher for TippingPoint and the Zero Day Initiative showed that when used in a web page Java would reference properties of the window.navigator object as it started up. If the page replaced the navigator object before starting Java then the browser would crash in a way that could...

Mozilla Firefox Tag Order Vulnerability — Mozilla

A particular sequence of HTML tags that reliably crash Mozilla clients was reported by an anonymous researcher via TippingPoint and the Zero Day Initiative. The crash is due to memory corruption that can be exploited to run arbitrary code...

Read beyond buffer while parsing XML — Mozilla

An upgrade in the XML parser introduced a bug that could read beyond the end of the buffer, often causing a crash. We don't know if this could be exploited to incorporate private data into the DOM of an XML document, but could be a privacy risk if so. Firefox 1.0, Thunderbird 1.0 and Mozilla Suit...

Integer overflows in E4X, SVG, and Canvas — Mozilla

Georgi Guninski reports integer overflows in the new E4X, SVG, and Canvas features. These lead to memory corruption that is potentially exploitable to run arbitrary code...

Security Vulnerabilities fixed in Firefox for iOS 151.1 — Mozilla

Firefox for iOS displayed specially crafted right-to-left RTL and internationalized domain names IDNs incorrectly in link preview UI surfaces. A crafted RTL hostname could visually reorder portions of the displayed domain, causing attacker-controlled sites to appear as trusted origins...

Security Vulnerabilities fixed in Firefox 150.0.3 — Mozilla

CVE-2026-8388: Incorrect boundary conditions in the JavaScript Engine: JIT component Reporter ggwhyp Impact high References Bug 2036978 CVE-2026-8389: JIT miscompilation in the JavaScript Engine: JIT component Reporter ggwhyp Impact high References Bug 2036983 CVE-2026-8390: Use-after-free in the...

Security Vulnerabilities fixed in Thunderbird 138 — Mozilla

Thunderbird's update mechanism allowed a medium-integrity user process to interfere with the SYSTEM-level updater by manipulating the file-locking behavior. By injecting code into the user-privileged process, an attacker could bypass intended access controls, allowing SYSTEM-level file operations...