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...

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...

Security Vulnerabilities fixed in Thunderbird 151 — Mozilla

Memory safety bugs present in 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. Some of these bugs...

Security Vulnerabilities fixed in Firefox 139.0.4 — Mozilla

Certain canvas operations could have lead to memory corruption. An integer overflow was present in OrderedHashTable used by the JavaScript engine...

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 Vulnerability fixed in Firefox 131.0.3 — Mozilla

When manipulating the selection node cache, an attacker may have been able to cause unexpected behavior, potentially leading to an exploitable crash...

Security Vulnerabilities fixed in Firefox for iOS 129 — Mozilla

Long pressing on a download link could potentially provide a means for cross-site scripting The contextual menu for links could provide an opportunity for cross-site scripting attacks When a user scans a QR Code with the QR Code Scanner feature, the user is not prompted before being navigated to...

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...

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...

Code execution via javascript: IconURL — Mozilla

Two vulnerabilities found in Mozilla Firefox 1.0.3 when combined allow an attacker to run arbitrary code. The Mozilla Suite version 1.7.7 is only partially vulnerable...

Heap overrun handling malicious news: URL — Mozilla

Maurycy Prodeus of iSEC Security Research reports a heap overrun in processing certain news: URLs. Thunderbird and the Mozilla Suite are affected; Firefox does not support the news: scheme...

Security Vulnerabilities fixed in Thunderbird 150.0.2 — 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. Memory safety bugs present in Thunderbird 150.0.1. Some of...

Security Vulnerabilities fixed in Firefox 135.0.1 — Mozilla

Memory safety bugs present in Firefox 135. 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 — 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. An attacker could cause a select...

Security Vulnerabilities fixed in Firefox ESR 128.4 — Mozilla

A permission leak could have occurred from a trusted site to an untrusted site via embed or object elements. An attacker could have caused a use-after-free when accessibility was enabled, leading to a potentially exploitable crash. The origin of an external protocol handler prompt could have been...

Security Vulnerabilities fixed in Focus for iOS 122 — Mozilla

An attacker could have executed unauthorized scripts on top origin sites using a JavaScript URI when opening an external URL with a custom Firefox scheme and a timeout race condition...

Inferring keystrokes from motion data — Mozilla

University of California, Davis researchers Liang Cai and Hao Chen presented a paper at the 2011 USENIX HotSec workshop on inferring keystrokes from device motion data on mobile devices. Web pages can now receive data similar to the apps studied in that paper and likely present a similar risk. We...

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 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...

Mail responds to cookie requests — Mozilla

Mozilla mail clients from March to December 2004 responded to cookie requests accompanying content loaded over HTTP, ignoring the setting of the preference "network.cookie.disableCookieForMailNews" disabled cookies are the default in mail...

Security Vulnerabilities fixed in Firefox ESR 128.10.1 — 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 Firefox 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 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 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...

COPPA error screen in FxAccounts signup allows loading arbitrary web content into B2G root process — Mozilla

Kartikaya Gupta of Mozilla reported an issue within the Firefox Accounts setup dialog that would embed content from a static external URI into the System process. An attacker in a position to control a vulnerable device's network connection could use this to inject arbitrary web content into the...

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...

file: URIs inherit chrome privileges when opened from chrome — Mozilla

Security researcher Luke Bryan reported that file: URIs are given chrome privileges when opened in the same tab as a chrome page or privileged about: page. This vulnerability could be used by an attacker to run arbitrary JavaScript with chrome privileges. The severity of this issue was determined...

XSLT can include stylesheets from arbitrary hosts — Mozilla

xsl:include and xsl:import can include XSLT stylesheets from arbitrary domains including those behind the user's firewall. This at least allows for existence checking of these files; it's not clear how much, if any, data could be extracted from arbitrary XML files...

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 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 Firefox 147.0.2 — Mozilla

CVE-2026-24868: Mitigation bypass in the Privacy: Anti-Tracking component Reporter Masato Kinugawa Impact moderate References Bug 2007302 CVE-2026-24869: Use-after-free in the Layout: Scrolling and Overflow component Reporter Hiroyuki Ikezoe Impact high References Bug 2008698...

Security Vulnerabilities fixed in Firefox ESR 115.24 — Mozilla

A double-free could have occurred in vpxcodecencinitmulti after a failed allocation when initializing the encoder for WebRTC. This could have caused memory corruption and a potentially exploitable crash. Error handling for script execution was incorrectly isolated from web content, which could ha...

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 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 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...

Crash viewing multipart/alternative message with text/enhanced part — Mozilla

Bernd Jendrissek reported a crash in Thunderbird when viewing a multipart/alternative mail message with a text/enhanced part. Internally this led to operations on an unexpected type of object resulting in a crash which may be exploitable...

Link opened in new tab can load a local file — Mozilla

Links with a custom getter and toString method can bypass checks intended to prevent web content from linking to local files and "chrome" URIs if the user can be convinced to middle-click or control-click to open it in a new tab. The browser's "same-origin" policy prevents the attacker's content...

Security Vulnerabilities fixed in Firefox for iOS 152.3 — Mozilla

A malicious webpage could interrupt a pending navigation by enqueuing a synchronous JavaScript dialog, causing the browser UI to display the destination origin in the address bar while continuing to render attacker-controlled content...

Security Vulnerabilities fixed in Thunderbird 152 — Mozilla

Memory safety bugs present in Firefox 151 and Thunderbird 151. 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 Firefox ESR 140.11, Thunderbird ESR 140.11,...

Security Vulnerabilities fixed in Firefox 148 — Mozilla

Memory safety bugs present in 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 Firefox ESR 140.7, Thunderbird ESR 140.7,...

Security Vulnerabilities fixed in Firefox 146.0.1 — Mozilla

Memory safety bugs present in Firefox 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 for iOS 144.0 — Mozilla

Unicode RTLO characters could allow malicious websites to spoof filenames in the downloads UI for Firefox for iOS, potentially tricking users into saving files of an unexpected file type...

Security Vulnerabilities fixed in Thunderbird 139 — Mozilla

A double-free could have occurred in vpxcodecencinitmulti after a failed allocation when initializing the encoder for WebRTC. This could have caused memory corruption and a potentially exploitable crash. Error handling for script execution was incorrectly isolated from web content, which could ha...

Security Vulnerabilities fixed in Firefox ESR 115.23.1 — 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 Firefox ESR 115.23 — 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 for iOS 131.2 — Mozilla

Opening an external link to an HTTP website when Firefox iOS was previously closed and had an HTTPS tab open could in some cases result in the padlock icon showing an HTTPS indicator incorrectly...

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...

Security Vulnerabilities fixed in Focus for iOS 123 — Mozilla

Utilizing a 302 redirect, an attacker could have conducted a Universal Cross-Site Scripting UXSS on a victim website, if the victim had a link to the attacker's website...