Security Vulnerabilities fixed in Firefox ESR 115.3 — Mozilla

A compromised content process could have provided malicious data to FilterNodeD2D1 resulting in an out-of-bounds write, leading to a potentially exploitable crash in a privileged process.This bug only affects Firefox on Windows. Other operating systems are unaffected. A compromised content proces...

Security Vulnerabilities fixed in Firefox ESR 91.8 — Mozilla

NSSToken objects were referenced via direct points, and could have been accessed in an unsafe way on different threads, leading to a use-after-free and potentially exploitable crash. If a compromised content process sent an unexpected number of WebAuthN Extensions in a Register command to the...

Service Worker Manager out-of-bounds read in Service Worker Manager — Mozilla

Security researcher Looben Yang reported a mechanism where the Clients API in Service Workers can be used to trigger an out-of-bounds read in ServiceWorkerManager. This results in a potentially exploitable crash...

Use-after-free in GetStaticInstance in WebRTC — Mozilla

Security researcher Ronald Crane reported a race condition in GetStaticInstance in WebRTC which results in a use-after-free. This could result in a potentially exploitable crash. This issue was found through code inspection and does not have clear mechanism to be exploited through web content but...

Referrer policy ignored when links opened by middle-click and context menu — Mozilla

Security researcher Alex Verstak reported that is ignored when a link is opened through the context menu or a middle-click by mouse. This means that, in some situations, the referrer policy is ignored when opening links in new tabs and may cause some pages to open without an HTTP Referer header...

Out-of-bounds read and write in asm.js validation — Mozilla

Security researcher Dougall Johnson reported an out-of-bounds read and write in asm.js during JavaScript validation due to an error in how heap lengths are defined. This results in a potentially exploitable crash and could allow for the reading of random memory which may contain sensitive data...

Code execution through incorrect JavaScript bounds checking elimination — Mozilla

Security researcher ilxu1a reported, through HP Zero Day Initiative's Pwn2Own contest, a flaw in Mozilla's implementation of typed array bounds checking in JavaScript just-in-time compilation JIT and its management of bounds checking for heap access. This flaw can be leveraged into the reading an...

Use-after-free in DirectWrite font handling — Mozilla

Mozilla community member James Kitchener reported a crash in DirectWrite when rendering MathML content with specific fonts due to an error in how font resources and tables are handled. This leads to use-after-free of a DirectWrite font-face object, resulting in a potentially exploitable crash...

Clickjacking through cursor invisibility after Flash interaction — Mozilla

Security researcher Jordi Chancel reported a mechanism where the cursor can be rendered invisible after it has been used on an embedded flash object when used outside of the object. This flaw can be in used in combination with an image of the cursor manipulated through JavaScript, leading to...

Out of bounds write in NSPR — Mozilla

Security researcher Abhishek Arya Inferno of the Google Chrome Security Team reported an out of bounds write in the Netscape Portable Runtime NSPR leading to a potentially exploitable crash or code execution. This issue is fixed in NSPR version 4.10.6...

WebGL content injection from one domain to rendering in another — Mozilla

Mozilla developer Jeff Gilbert discovered a mechanism where a malicious site with WebGL content could inject content from its context to that of another site's WebGL context, causing the second site to replace textures and similar content. This cannot be used to steal data but could be used to...

Improper state in HTML5 Tree Builder with templates — Mozilla

Using the Address Sanitizer tool, security researcher Atte Kettunen from OUSPG found that the HTML5 Tree Builder does not properly store state when interacting with template elements. Because some stack information is incorrectly stored, the template insertion mode stack can be used when it is...

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...

Mozilla Updater does not lock MAR file after signature verification — Mozilla

Security researcher Seb Patane reported that the Mozilla Updater does not write-lock the MAR update file when it is in use by the Updater. This leaves open the possibility of altering the contents of the MAR file after the signature on the file has been verified as valid but before it has been...

WebGL Information disclosure through OS X NVIDIA graphic drivers — Mozilla

Mozilla developer Victor Porof reported a flaw in the NVIDIA OS X graphic drivers that would allow portions of a user's desktop or other visible applications to be incorporated into WebGL canvases. This could result in personal information becoming available to web content...

Miscellaneous memory safety hazards (rv:23.0 / rv:17.0.8) — 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...

Privilege escalation through Mozilla Updater — Mozilla

Security researcher Ash reported an issue with the Mozilla Updater. The Mozilla Updater can be made to load a malicious local DLL file in a privileged context through either the Mozilla Maintenance Service or independently on systems that do not use the service. This occurs when the DLL file is...

Use-after-free in ListenerManager — Mozilla

Security researcher regenrecht reported, via TippingPoint's Zero Day Initiative, a use-after-free within the ListenerManager when garbage collection is forced after data in listener objects have been allocated in some circumstances. This results in a use-after-free which can lead to arbitrary cod...

Use-after-free in shlwapi.dll — Mozilla

Security researchers Blair Strang and Scott Bell of Security Assessment found that when a parent window spawns and closes a child window that uses the file open dialog, a crash can be induced in shlwapi.dll on 32-bit Windows 7 systems. This crash may be potentially exploitable...

Potentially exploitable WebGL crashes — Mozilla

Michael Jordon of Context IS reported that in the ANGLE library used by WebGL the return value from GrowAtomTable was not checked for errors. If an attacker could cause requests that exceeded the available memory those would fail and potentially lead to a buffer overrun as subsequent code wrote...

Use-after-free error in nsBarProp — Mozilla

Security researcher Sergey Glazunov reported that it was possible to access the locationbar property of a window object after it had been closed. Since the closed window's memory could have been subsequently reused by the system it was possible that an attempt to access the locationbar property...

XSS using a chrome XBL method and window.eval — Mozilla

Mozilla security researcher mozbugra4 reported that a chrome XBL method can be used in conjunction with window.eval to execute arbitrary JavaScript within the context of another website, violating the same origin policy...

Crash and remote code execution via __proto__ tampering — Mozilla

Mozilla developer Jesse Ruderman demonstrated that by tampering with the window.proto.proto object, one can cause the browser to place a lock on a non-native object, leading to a crash. Although we have not demonstrated such control, a determined attacker might be able to exploit this crash to ru...

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...

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...

JavaScript privilege escalation and arbitrary code execution — Mozilla

Mozilla contributors mozbugra4, Boris Zbarsky, and Johnny Stenback reported a series of vulnerabilities which allow scripts from page content to run with elevated privileges. mozbugra4 demonstrated additional variants of MFSA 2007-25 and MFSA2007-35 arbitrary code execution through XPCNativeWrapp...

Mozilla Network Security Services (NSS) SSLv2 buffer overflows — Mozilla

iDefense has informed Mozilla about two potential buffer overflow vulnerabilities found by researcher regenrecht in the Network Security Services NSS code for processing the SSLv2 protocol...

Security Vulnerabilities fixed in Firefox 151.0.3 — Mozilla

CVE-2026-10701: Incorrect boundary conditions in the Graphics: Text component Reporter taiho kim Impact high References Bug 2038537 CVE-2026-10702: JIT miscompilation in the JavaScript Engine: JIT component Reporter Nebula Security Impact high References Bug 2040903...

Security Vulnerabilities fixed in Focus for iOS 126 — Mozilla

The file scheme of URLs would be hidden, resulting in potential spoofing of a website's address in the location bar...

Security Vulnerabilities fixed in Firefox ESR 115.8 — Mozilla

When storing and re-accessing data on a networking channel, the length of buffers may have been confused, resulting in an out-of-bounds memory read. Through a series of API calls and redirects, an attacker-controlled alert dialog could have been displayed on another website with the victim...

Security Vulnerabilities fixed in Firefox for iOS 120 — Mozilla

An attacker could have accessed internal pages or data by ex-filtrating a security key from ReaderMode via the referrerpolicy attribute. An attacker could have performed HTML template injection via Reader Mode and exfiltrated user information...

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 Firefox ESR 102.1 — Mozilla

When combining CSS properties for overflow and transform, the mouse cursor could interact with different coordinates than displayed. When visiting directory listings for chrome:// URLs as source text, some parameters were reflected. When opening a Windows shortcut from the local filesystem, an...

Security Vulnerabilities fixed in Firefox ESR 91.2 — Mozilla

During operations on MessageTasks, a task may have been removed while it was still scheduled, resulting in memory corruption and a potentially exploitable crash. Through use of reportValidity and window.open, a plain-text validation message could have been overlaid on another origin, leading to...

Security Vulnerabilities fixed in Thunderbird 91.1 — Mozilla

When delegating navigations to the operating system, Thunderbird would accept the mk scheme which might allow attackers to launch pages and execute scripts in Internet Explorer in unprivileged mode. This bug only affects Thunderbird for Windows. Other operating systems are unaffected. Mozilla...

Security vulnerabilities fixed in Firefox ESR 45.6 — Mozilla

Use-after-free while manipulating DOM events and removing audio elements due to errors in the handling of node adoption. Event handlers on marquee elements were executed despite a strict Content Security Policy CSP that disallowed inline JavaScript. Memory corruption resulting in a potentially...

Delay following click events in file download dialog too short on OS X — Mozilla

Security researcher Jordi Chancel reported an issue on OS X where the delay between the download dialog getting focus and the button getting enabled was too short. If an attacker is able to induce the user to double-click in a specific location, they can then pass the second click through to the...

Missing delay following user click events in protocol handler dialog — Mozilla

Security researcher window reported an issue where the protocol handler dialog appears, double click events are treated as two single click events. This was caused by the lack of a delay following the initial focus in the file download dialog. This could cause a second dialog to be sent the secon...

Arbitrary file overwriting through Mozilla Maintenance Service with hard links — Mozilla

Security researcher James Forshaw, security researcher with Google Project Zero, reported that the Mozilla Maintenance Service on Windows can be made to write its log file in a restricted location with an arbitrary file name through the use of a hard link by means of a race condition. This can...

Cursor clickjacking with flash and images — Mozilla

Security researcher Jordi Chancel reported a mechanism that made cursor invisible through flash content and then replaced it through the layering of HTML content. This flaw can be in used in combination with an image of the cursor manipulated through JavaScript, leading to clickjacking during...

Accessing cross-origin objects via the Alarms API — Mozilla

Mozilla developer Boris Zbarsky reported that a malicious app could use the AlarmAPI to read the values of cross-origin references, such as an iframe's location object, as part of an alarm's JSON data. This allows a malicious app to bypass same-origin policy...

Toolbar dialog customization event spoofing — Mozilla

Mozilla developers David Chan and Gijs Kruitbosch reported that it is possible to create a drag and drop event in web content which mimics the behavior of a chrome customization event. This can occur when a user is customizing a page or panel. This results in a limited ability to move UI icons...

Information disclosure with *FromPoint on iframes — Mozilla

Security researcher Jordan Milne reported an information leak where document.caretPositionFromPoint and document.elementFromPoint functions could be used on a cross-origin iframe to gain information on the iframe's DOM and other attributes through a timing attack, violating same-origin policy...

Same-origin bypass through symbolic links — Mozilla

Security researcher Takeshi Terada reported a mechanism to violate same-origin policy for local files using file:// through the use of symbolic links. This problem only affects web pages loaded from the local filesystem. This could allow for cross-site scripting XSS and access to locally stored...

World read and write access to app_tmp directory on Android — Mozilla

Security researcher Shuichiro Suzuki of the Fourteenforty Research Institute reported the apptmp directory is set to be world readable and writeable by Firefox for Android. This potentially allows for third party applications to replace or alter Firefox add-ons when downloaded because they are...

Javascript: URLs run in privileged context on New Tab page — Mozilla

Security researcher [email protected] reported that if a javascript: URL is selected from the list of Firefox "new tab" page, the script will inherit the privileges of the privileged "new tab" page. This allows for the execution of locally installed programs if a user can be convinced to save a...

Information disclosure though Windows file shares and shortcut files — Mozilla

Security researcher Paul Stone reported an attack where an HTML page hosted on a Windows share and then loaded could then load Windows shortcut files .lnk in the same share. These shortcut files could then link to arbitrary locations on the local file system of the individual loading the HTML pag...

Directory traversal in resource: protocol — Mozilla

Security researcher Soroush Dalili reported that the resource: protocol could be exploited to allow directory traversal on Windows and the potential loading of resources from non-permitted locations. The impact would depend on whether interesting files existed in predictable locations in a useful...

Unsafe library loading vulnerabilities — Mozilla

Mozilla developer Ehsan Akhgari reported that a function used to load external libraries on Windows platforms was using a relative path to a DLL-loading application and was thus vulnerable to binary planting if an attacker was able to place an executable of the same name in the current working...

Dangling pointer vulnerability in nsTreeContentView — Mozilla

Security researcher regenrecht reported via TippingPoint's Zero Day Initiative that the implementation of XUL 's content view contains a dangling pointer vulnerability. One of the content view's methods for accessing the internal structure of the tree could be manipulated into removing a node pri...