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 Thunderbird 140.7 — Mozilla

Memory safety bugs present in Firefox ESR 140.6, Thunderbird ESR 140.6, Firefox 146 and Thunderbird 146. 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 128.10 — Mozilla

Mozilla Firefox'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...

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...

Non-whitelisted site can trigger xpinstall — Mozilla

Mozilla security researcher mozbugra4 reported that it was possible for a non-whitelisted site to trigger an install dialog for add-ons and themes...

Form history vulnerable to stealing — Mozilla

Security researcher Paul Stone reported that a user's form history, both from web content as well as the smart location bar, was vulnerable to theft. A malicious web page could synthesize events such as mouse focus and key presses on behalf of the victim and trick the browser into auto-filling th...

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...

Crashes with evidence of memory corruption (rv:1.9.0.5/1.8.1.19) — 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...

User tracking via XUL persist attribute — Mozilla

Security researcher Hish reported that the persist attribute in XUL elements can be used to store cookie-like information on a user's computer which could later be read by a website. This creates a privacy issue for users who have a non-standard cookie preference and wish to prevent sites from...

Information stealing via loadBindingDocument — Mozilla

Mozilla developer Boris Zbarsky reported that XBL bindings could be used to read data from other domains, a violation of the same-origin policy. The severity of this issue was determined to be moderate due to several mitigating factors:...

Memory corruption with simultaneous events — Mozilla

Secunia Research has discovered a vulnerability in Mozilla Firefox 1.5 branch, which can be exploited by malicious people to compromise a user's system...

Javascript prompt origin spoofing — Mozilla

Alerts and prompts created by scripts in web pages are presented with the generic title JavaScript Application which sometimes makes it difficult to know which site created them. A malicious page could attempt to cause a prompt to appear in front of a trusted site in an attempt to extract...

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 Thunderbird 140.6 — Mozilla

Memory safety bugs present in Firefox ESR 140.5, Thunderbird ESR 140.5, Firefox 145 and Thunderbird 145. 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 128.5.2 — Mozilla

The Matrix specification demands homeservers to perform validation of the server-name and media-id components of MXC URIs with the intent to prevent path traversal. However, it is not mentioned that a similar check must also be performed on the client to prevent client-side path traversal...

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...

Arbitrary socket connections with Java LiveConnect on Mac OS X — Mozilla

Security researcher Gregory Fleischer reported a vulnerability in the way Mozilla indicates the origin of a document to the Java Embedding Plugin JEP that ships with Firefox on Mac OS X. This vulnerability could allow a malicious Java applet to bypass the same-origin policy and create arbitrary...

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...

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 ...

javascript: Livefeed bookmarks can steal cookies — Mozilla

Earlier versions of Firefox allowed javascript: and data: URLs as Livefeed bookmarks. When they updated the URL would be run in the context of the current page and could be used to steal cookies or data displayed on the page...

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 Thunderbird 140.9 — Mozilla

A malicious mail server could send malformed strings with negative lengths, causing the parser to read memory outside the buffer. If a mail server or connection to a mail server were compromised, an attacker could cause the parser to malfunction, potentially crashing Thunderbird or leaking...

Security Vulnerabilities fixed in Thunderbird 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 Thunderbird 128.14 — Mozilla

An attacker was able to perform memory corruption in the GMP process which processes encrypted media. This process is also heavily sandboxed, but represents slightly different privileges from the content process. Same-origin policy bypass in the Graphics: Canvas2D component. Uninitialized memory ...

Security Vulnerabilities fixed in Thunderbird 138.0.1 — Mozilla

Thunderbird parses addresses in a way that can allow sender spoofing in case the server allows an invalid From address to be used. For example, if the From header contains an invalid value "Spoofed Name [email protected] [email protected]", Thunderbird treats [email protected] as the...

Security Vulnerabilities fixed in Thunderbird 136 — Mozilla

Certain crafted MIME email messages that claimed to contain an encrypted OpenPGP message, which instead contained an OpenPGP signed message, were wrongly shown as being encrypted. When requesting an OpenPGP key from a WKD server, an incorrect padding size was used and a network observer could hav...

Security Vulnerabilities fixed in Thunderbird 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 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...

Dangling pointer crash regression from plugin parameter array fix — Mozilla

Mozilla developer Daniel Holbert reported that the fix to the plugin parameter array crash that was fixed in Firefox 3.6.7 caused a crash showing signs of memory corruption. In certain circumstances, properties in the plugin instance's parameter array could be freed prematurely leaving a dangling...

Remote compromise via content-defined setter on object prototypes — Mozilla

Paul Nickerson discovered that content-defined setters on an object prototype were getting called by privileged UI code, and mozbugra4 was able to develop an exploit PoC that demonstrated that the higher privilege level could be passed along to the content-defined attack code...

Secure-site spoof (requires security warning dialog) — Mozilla

Tristor reports that it was possible to spoof the browser's secure-site indicators the lock icon, the site name in the URL field, the gold URL field background in Firefox by first loading the target secure site in a pop-up window, then changing its location to a different site...

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...

Overwrite arbitrary files downloading .lnk twice — Mozilla

If a windows user can be convinced to download a .lnk file twice to the same location an attacker can overwrite essentially delete arbitrary files on the user's machine: the file referenced by the first .lnk will be overwritten by the second download rather than replacing the .lnk itself. On some...

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 Focus for iOS 142 — Mozilla

Focus for iOS would not respect a Content-Disposition header of type Attachment and would incorrectly display the content inline, potentially allowing for XSS attacks Dragging JavaScript links to the URL bar in Focus for iOS could be utilized to run malicious scripts, potentially resulting in XSS...

Security Vulnerabilities fixed in Firefox ESR 115.27 — Mozilla

An attacker was able to perform memory corruption in the GMP process which processes encrypted media. This process is also heavily sandboxed, but represents slightly different privileges from the content process. Same-origin policy bypass in the Graphics: Canvas2D component. Memory safety bugs...

Security Vulnerabilities fixed in Thunderbird 138.0.2 — 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 137 — Mozilla

JavaScript code running while transforming a document with the XSLTProcessor could lead to a use-after-free. An attacker could read 32 bits of values spilled onto the stack in a JIT compiled function. Leaking of file descriptors from the fork server to web content processes could allow for...

Security Vulnerabilities fixed in Thunderbird 128.3 — 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...

Mis-issued ANSSI/DCSSI certificate — Mozilla

Google notified Mozilla that an intermediate certificate, which chains up to a root included in Mozilla’s root store, was loaded into a man-in-the-middle MITM traffic management device. This certificate was issued by Agence nationale de la sécurité des systèmes d'information ANSSI, an agency of t...

XBM image uninitialized memory reading — Mozilla

Security researcher Billy Hoffman discovered a bug in the XBM decoder that allowed random small chunks of uninitialized memory to be read. The severity of this bug was low and did not appear to cause any memory corruption...

chrome: scheme loading remote content — Mozilla

Benjamin Smedberg discovered that chrome URL's could be made to reference remote files, which would run scripts with full privilege. There is no known way for web content to successfully load a chrome: url, but if a user could be convinced to do so manually perhaps by copying a link and pasting i...

Same-origin violation with InstallTrigger callback — Mozilla

The InstallTrigger.install method for launching an install accepts a callback function that will be called with the final success or error status. By forcing a page navigation immediately after calling the install method this callback function can end up running in the context of the new page...

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...

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...

Security Vulnerabilities fixed in Firefox ESR 115.38 — Mozilla

We are aware that exploit code for this is public however we are not aware of any attacks in the wild abusing this flaw. Memory safety bugs present in Firefox ESR 115.37, Firefox ESR 140.12 and Firefox 152. Some of these bugs showed evidence of memory corruption and we presume that with enough...

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 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 Thunderbird 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 Thunderbird 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...