Secure site lock can be spoofed with a binary download — Mozilla

While on an insecure page triggering a load of a binary file from a secure server will cause the SSL lock icon to appear. The certificate information is that of the binary file's host, while the location bar URL correctly shows the original insecure page...

Security Vulnerabilities fixed in Firefox for Android 153.0.3 — Mozilla

CVE-2026-18809: Information disclosure in Firefox for Android and Firefox Focus for Android Reporter The Mozilla Fuzzing Team Impact high References Bug 2055683...

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 Thunderbird 140.10.1 — Mozilla

Memory safety bugs present in Thunderbird ESR 140.10.0 and Thunderbird 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. Memory safety bugs present in Thunderbird ESR 140.10.0 and...

Security Vulnerabilities fixed in Firefox ESR 140.9 — Mozilla

Memory safety bugs present in Firefox ESR 140.8, Thunderbird ESR 140.8, Firefox 148 and Thunderbird 148. 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 146 — Mozilla

Memory safety bugs present in 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. Memory safety bugs present in Firefox ESR 140.5, Thunderbird ESR 140.5,...

Security Vulnerabilities fixed in Firefox 146 — Mozilla

Memory safety bugs present in 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. Memory safety bugs present in Firefox ESR 140.5, Thunderbird ESR 140.5,...

Security Vulnerabilities fixed in Firefox ESR 140.5 — Mozilla

CVE-2025-13012: Race condition in the Graphics component Reporter Irvan Kurniawan Impact high References Bug 1991458 CVE-2025-13016: Incorrect boundary conditions in the JavaScript: WebAssembly component Reporter Igor Morgenstern Impact high References Bug 1992130 CVE-2025-13017: Same-origin poli...

Security Vulnerabilities fixed in Firefox 145 — Mozilla

Memory safety bugs present in Firefox 144 and Thunderbird 144. 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 140.4 — 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 Firefox 143.0.3 — Mozilla

CVE-2025-11152: Sandbox escape due to integer overflow in the Graphics: Canvas2D component Reporter Oskar L Impact high References Bug 1987246 CVE-2025-11153: JIT miscompilation in the JavaScript Engine: JIT component Reporter Nan Wang Impact high References Bug 1987481...

Security Vulnerabilities fixed in Firefox ESR 140.2 — 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 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 Firefox ESR 128.13 — 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...

Security Vulnerabilities fixed in Firefox ESR 128.12 — Mozilla

A use-after-free in FontFaceSet resulted in a potentially exploitable crash. An attacker who enumerated resources from the WebCompat extension could have obtained a persistent UUID that identified the browser, and persisted between containers and normal/private browsing mode, but not profiles. Th...

Security Vulnerabilities fixed in Thunderbird 128.11 — 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 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 132.0.1 — Mozilla

Using remote content in OpenPGP encrypted messages can lead to the disclosure of plaintext...

UMS (USB) mounting after reboot even without unlocking — Mozilla

Clement Lefevre reported a bug in USB Mass Storage handling of Firefox OS that would allow unauthorized access to device data through the USB interface. The logic error would under certain circumstances expose USB media volumes to USB hosts while the device is locked with a pass code, for example...

Search plugin cross-site scripting — Mozilla

A malicious search plugin could run javascript in the context of the displayed page each time a search is run. This could be used to steal cookies or page contents, or issue commands to that site on the user's behalf. If the open page has elevated privileges about:plugins, about:config then the...

Install source spoofing with user:pass@host — Mozilla

The installation confirmation dialog shows the source of the software. By adding a long, fake "user:pass" in front of the true hostname the user might be convinced to trust software that comes from an untrustworthy source. This is similar to attempts used in some phishing mail:...

Script-generated event can download without prompting — Mozilla

Script-generated click events were indistinguishable from true clicks. Combined with the Firefox Alt+click feature that downloads links to the default location without prompting this could be used by malicious sites to place executables or other malware onto a windows user's desktop without their...

javascript: links in Thunderbird launch Internet Explorer — Mozilla

Clicking on javascript: links in Thunderbird launched the default handler for that scheme registered with the OS. On the Windows operating system Internet Explorer is the default handler for the javascript: scheme even when Firefox is the default browser...

Input stealing from other tabs — Mozilla

Jakob Balle of Secunia reported two vulnerabilities in windows with multiple tabs. Malicious content in a background tab can attempt to steal information intended for the topmost tab by popping up prompt dialog that appears to come from the trusted site, or by silently redirecting input focus to ...

Security Vulnerabilities fixed in Thunderbird 152.0.1 — Mozilla

A malicious LDAP server, which a Thunderbird user is configured to query for address-book autocomplete, can stash arbitrarily large amounts of attacker-supplied data into the Thunderbird LDAP client until it crashes due to memory exhaustion. An attacker who can send HTML chat messages via Matrix ...

Security Vulnerabilities fixed in Thunderbird 149.0.2 — Mozilla

Memory safety bugs present in Firefox ESR 115.34.0, Firefox ESR 140.9.0, Thunderbird ESR 140.9.0, Firefox 149.0.1 and Thunderbird 149.0.1. 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 Firefox 147 — 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. Memory safety bugs present in...

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 Firefox for iOS 143.1 — Mozilla

Cookie storage for non-HTML temporary documents was being shared incorrectly with normal browsing content, allowing information from private tabs to escape Incognito mode even after the user closed all tabs...

Security Vulnerabilities fixed in Firefox ESR 140.3 — Mozilla

Memory safety bugs present in Firefox ESR 140.2, Thunderbird ESR 140.2, Firefox 142 and Thunderbird 142. 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 142 — 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 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 vulnerability fixed in Focus for iOS 138 — Mozilla

Websites directing users to long URLs that caused eliding to occur in the location view could leverage the truncating behavior to potentially trick users into thinking they were on a different webpage...

Security Vulnerabilities fixed in Firefox ESR 115.22 — Mozilla

JavaScript code running while transforming a document with the XSLTProcessor could lead to a use-after-free...

Security Vulnerabilities fixed in Thunderbird ESR 128.6 — Mozilla

The WebChannel API, which is used to transport various information across processes, did not check the sending principal but rather accepted the principal being sent. This could have led to privilege escalation attacks. Assuming a controlled failed memory allocation, an attacker could have caused...

Security Vulnerabilities fixed in Firefox ESR 115.17 — 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. Video frames could have been leaked between origins in some...

Protection against fraudulent DigiNotar certificates — Mozilla

Description: Google Chrome user alibo encountered an active "man in the middle" MITM attack on secure SSL connections to Google servers. The fraudulent certificate was mis-issued by DigiNotar, a Dutch Certificate Authority. DigiNotar has reported evidence that other fraudulent certificates were...

The return of frame-injection spoofing — Mozilla

The original frame-injection spoofing bug was fixed in the Mozilla Suite 1.7 and Firefox 0.9 releases. This protection was accidentally bypassed by one of the fixes in the Firefox 1.0.3 and Mozilla Suite 1.7.7 releases...

Content-generated event vulnerabilities — Mozilla

In several places the browser UI did not correctly distinguish between true user events, such as mouse clicks or keystrokes, and synthetic events generated by web content. The problems ranged from minor annoyances like switching tabs or entering full-screen mode, to a variant on MFSA 2005-34...

Code execution through javascript: favicons — Mozilla

Firefox and the Mozilla Suite support custom "favicons" through the tag. If a link tag is added to the page programmatically and a javascript: url is used, then script will run with elevated privileges and could run or install malicious software...

Privilege escalation via DOM property overrides — Mozilla

mozbugra4 reported several exploits giving an attacker the ability to install malicious code or steal data, requiring only that the user do commonplace actions like click on a link or open the context menu. The common cause in each case was privileged UI code "chrome" being overly trusting of DOM...

Showing blocked javascript: popup uses wrong privilege context — Mozilla

When a popup is blocked the user is given the ability to open that one popup through the popup-blocking status bar icon and, in Firefox, through the infobar. If the popup URL were javascript: selecting "Show javascript:..." from the infobar or popup blocking status bar icon menus would run the...

Internationalized Domain Name (IDN) homograph spoofing — Mozilla

Internationalized Domain Names IDN allow non-English speakers to use domains in their local language. Because many supported characters are similar to other if not identical in some fonts there is the possibility this could be used to construct perfect, indistinguishable phishing sites...

Security Vulnerabilities fixed in Firefox 153 — Mozilla

Memory safety bugs present in Firefox 152. 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 140.12 and Firefox 152. Some of these bugs showed...

Security Vulnerabilities fixed in Firefox 152.0.6 — 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. We are aware that exploit code for this is public however we are not aware of any attacks in the wild abusing this flaw...

Security Vulnerabilities fixed in Firefox ESR 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 143 — Mozilla

Memory safety bugs present in Firefox ESR 140.2, Thunderbird ESR 140.2, Firefox 142 and Thunderbird 142. 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 140.3 — Mozilla

Memory safety bugs present in Firefox ESR 140.2, Thunderbird ESR 140.2, Firefox 142 and Thunderbird 142. 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 Focus for iOS 143.0 — Mozilla

Opening links via the contextual menu in Focus iOS for certain URL schemes would fail to load but would not refresh the toolbar correctly, allowing attackers to spoof websites if users were coerced into opening a link explicitly through a long-press...

Security Vulnerabilities fixed in Thunderbird 140.2 — 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 ...