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Medium 6.5
Unexpected GC during RegExp bailout processing
It was possible to interrupt the processing of a RegExp bailout and run additional JavaScript, potentially triggering garbage collection when the engine was not expecting it. This vulnerability was fixed in Firefox 136, Firefox ESR 128.8, Thunderbird 136, and…
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Medium 5.4CVE-2025-1015 Public exploit
Unsanitized address book fields
The Thunderbird Address Book URI fields contained unsanitized links. This could be used by an attacker to create and export an address book containing a malicious payload in a field. For example, in the “Other” field of the Instant Messaging section. If anoth…
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Medium 6.5
Address of e-mail sender can be spoofed by malicious email
Thunderbird displayed an incorrect sender address if the From field of an email used the invalid group name syntax that is described in CVE-2024-49040. This vulnerability was fixed in Thunderbird 128.7 and Thunderbird 135.
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Medium 6.5
Potential opening of private browsing tabs in normal browsing windows
A race condition could have led to private browsing tabs being opened in normal browsing windows. This could have resulted in a potential privacy leak. This vulnerability was fixed in Firefox 135, Firefox ESR 128.7, Thunderbird 128.7, and Thunderbird 135.
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Medium 4.3
Fullscreen notification not properly displayed
The z-order of the browser windows could be manipulated to hide the fullscreen notification. This could potentially be leveraged to perform a spoofing attack. This vulnerability was fixed in Firefox 135 and Thunderbird 135.
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Medium 6.5CVE-2025-0242 EPSS 15%
Memory safety bugs fixed in Firefox 134, Thunderbird 134, Firefox ESR 115.19, Firefox ESR 128.6, Thunderbird 115.19, and Thunderbird 128.6
Memory safety bugs present in Firefox 133, Thunderbird 133, Firefox ESR 115.18, Firefox ESR 128.5, Thunderbird 115.18, and Thunderbird 128.5. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could ha…
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Medium 5.1
Memory safety bugs fixed in Firefox 134, Thunderbird 134, Firefox ESR 128.6, and Thunderbird 128.6
Memory safety bugs present in Firefox 133, Thunderbird 133, Firefox ESR 128.5, and Thunderbird 128.5. 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.…
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Medium 5.3
Use-after-free when breaking lines in text
Assuming a controlled failed memory allocation, an attacker could have caused a use-after-free, leading to a potentially exploitable crash. This vulnerability was fixed in Firefox 134, Firefox ESR 128.6, Firefox ESR 115.19, Thunderbird 134, and Thunderbird 12…
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Medium 4.0
Alt-Svc ALPN validation failure when redirected
When using Alt-Svc, ALPN did not properly validate certificates when the original server is redirecting to an insecure site. This vulnerability was fixed in Firefox 134, Firefox ESR 128.6, Thunderbird 134, and Thunderbird 128.6.
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Medium 4.0
Compartment mismatch when parsing JavaScript JSON module
Parsing a JavaScript module as JSON could, under some circumstances, cause cross-compartment access, which may result in a use-after-free. This vulnerability was fixed in Firefox 134, Firefox ESR 128.6, Thunderbird 134, and Thunderbird 128.6.
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Medium 5.4
WebChannel APIs susceptible to confused deputy attack
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. This vulnerability was fixed in Firefox…
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Medium 6.1
Enhanced Tracking Protection's Strict mode may have inadvertently allowed a CSP `frame-src` bypass and DOM-based XSS th…
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Medium 5.3
matrix-js-sdk has insufficient MXC URI validation which allows client-side path traversal
matrix-js-sdk is a Matrix messaging protocol Client-Server SDK for JavaScript. matrix-js-sdk before 34.11.0 is vulnerable to client-side path traversal via crafted MXC URIs. A malicious room member can trigger clients based on the matrix-js-sdk to issue arbit…
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Medium 6.1
In multipart/x-mixed-replace responses, `Content-Disposition: attachment` in the response header was not respected and …
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Medium 5.4
The origin of an external protocol handler prompt could have been obscured using a data: URL within an `iframe`. This v…
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Medium 6.5
An attacker could have caused a use-after-free when accessibility was enabled, leading to a potentially exploitable cra…
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Medium 6.5
A permission leak could have occurred from a trusted site to an untrusted site via `embed` or `object` elements. This v…
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Medium 6.1
A missing delay in directory upload UI could have made it possible for an attacker to trick a user into granting permis…
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Medium 5.3
By checking the result of calls to `window.open` with specifically set protocol handlers, an attacker could determine i…
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Medium 6.1
An attacker could, via a specially crafted multipart response, execute arbitrary JavaScript under the `resource://devto…
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Medium 4.7
Race condition in permission assignment
A race condition could lead to a cross-origin container obtaining permissions of the top-level origin. This vulnerability affects Firefox < 128, Firefox ESR < 115.13, Thunderbird < 115.13, and Thunderbird < 128.
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Medium 4.7
By tricking the browser with a `X-Frame-Options` header, a sandboxed iframe could have presented a button that, if clic…
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Medium 6.1
Offscreen Canvas did not properly track cross-origin tainting, which could be used to access image data from another si…
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Medium 4.3
By monitoring the time certain operations take, an attacker could have guessed which external protocol handlers were fu…
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Medium 5.9
When importing resources using Web Workers, error messages would distinguish the difference between `application/javasc…
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Medium 6.1
A bug in popup notifications' interaction with WebAuthn made it easier for an attacker to trick a user into granting pe…
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Medium 5.6
PDF.js vulnerable to arbitrary JavaScript execution upon opening a malicious PDF
A type check was missing when handling fonts in PDF.js, which would allow arbitrary JavaScript execution in the PDF.js context. This vulnerability affects Firefox < 126, Firefox ESR < 115.11, and Thunderbird < 115.11.
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Medium 4.3
If the `browser.privatebrowsing.autostart` preference is enabled, IndexedDB files were not properly deleted when the wi…
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Medium 4.0
If an AlignedBuffer were assigned to itself, the subsequent self-move could result in an incorrect reference count and …
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Medium 5.9
On 32-bit versions there were integer-overflows that led to an out-of-bounds-read that potentially could be triggered b…
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Medium 5.5
A missing delay on when pointer lock was used could have allowed a malicious page to trick a user into granting permiss…
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Medium 6.1
Using a markup injection an attacker could have stolen nonce values. This could have been used to bypass strict content…
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Medium 6.5
NSS was susceptible to a timing side-channel attack when performing RSA decryption. This attack could potentially allow…
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Medium 6.1
The permission prompt input delay could expire while the window is not in focus. This makes it vulnerable to clickjacki…
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Medium 6.1
Set-Cookie response headers were being incorrectly honored in multipart HTTP responses. If an attacker could control th…
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Medium 6.1
If a website set a large custom cursor, portions of the cursor could have overlapped with the permission dialog, potent…
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Medium 6.1
A malicious website could have used a combination of exiting fullscreen mode and `requestPointerLock` to cause the user…
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Medium 6.5
Through a series of API calls and redirects, an attacker-controlled alert dialog could have been displayed on another w…
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Medium 4.3
A website could have obscured the fullscreen notification by using a dropdown select input element. This could have led…
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Medium 6.5
In specific HSTS configurations an attacker could have bypassed HSTS on a subdomain. This vulnerability affects Firefox…