CVE-2025-8039

Search terms persisted in URL bar

In some cases search terms persisted in the URL bar even after navigating away from the search page. This vulnerability was fixed in Firefox 141, Firefox ESR 140.1, Thunderbird 141, and Thunderbird 140.1.

CVSS 3.1 · 8.1 High EPSS < 1% KEV · Not listed

Vendors

Mozilla

Products

Firefox Firefox Esr Thunderbird

CVE-2025-8033

Incorrect JavaScript state machine for generators

The JavaScript engine did not handle closed generators correctly and it was possible to resume them leading to a nullptr deref. This vulnerability was fixed in Firefox 141, Firefox ESR 115.26, Firefox ESR 128.13, Firefox ESR 140.1, Thunderbird 141, Thunderbird 128.13, and Thunderbird 140.1.

CVSS 3.1 · 6.5 Medium EPSS < 1% KEV · Not listed

Vendors

Mozilla Redhat

Products

Firefox Firefox Esr Thunderbird and 1 more

CVE-2025-8040

Memory safety bugs fixed in Firefox ESR 140.1, Thunderbird ESR 140.1, Firefox 141 and Thunderbird 141

Memory safety bugs present in Firefox ESR 140.0, Thunderbird ESR 140.0, Firefox 140 and Thunderbird 140. 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. This vulnerability was fixed in Firefox 141, Firefox ESR 140.1, Thunderbird 141, and Thunderbird 140.1.

CVSS 3.1 · 8.8 High EPSS < 1% KEV · Not listed

Vendors

Mozilla

Products

Firefox Firefox Esr Thunderbird and 1 more

CVE-2025-9179

Sandbox escape due to invalid pointer in the Audio/Video: GMP component

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. This vulnerability was fixed in Firefox 142, Firefox ESR 115.27, Firefox ESR 128.14, Firefox ESR 140.2, Thunderbird 142, Thunderbird 128.14, and Thunderbird 140.2.

CVSS 3.1 · 9.8 Critical EPSS < 1% KEV · Not listed

Vendors

Mozilla

Products

Firefox Firefox Esr Thunderbird

CVE-2025-9186

Spoofing issue in the Address Bar component of Firefox Focus for Android

Spoofing issue in the Address Bar component of Firefox Focus for Android. This vulnerability was fixed in Firefox 142.

CVSS 3.1 · 6.5 Medium EPSS < 1% KEV · Not listed

Vendors

Google Mozilla

Products

Android Firefox

CVE-2025-9182

Denial-of-service due to out-of-memory in the Graphics: WebRender component

Denial-of-service due to out-of-memory in the Graphics: WebRender component. This vulnerability was fixed in Firefox 142, Firefox ESR 140.2, Thunderbird 142, and Thunderbird 140.2.

CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed

Vendors

Mozilla

Products

Firefox Firefox Esr Thunderbird

CVE-2025-9183

Spoofing issue in the Address Bar component

Spoofing issue in the Address Bar component. This vulnerability was fixed in Firefox 142 and Firefox ESR 140.2.

CVSS 3.1 · 6.5 Medium EPSS < 1% KEV · Not listed

Vendors

Mozilla

Products

Firefox Firefox Esr

CVE-2025-9184

Memory safety bugs fixed in Firefox ESR 140.2, Thunderbird ESR 140.2, Firefox 142 and Thunderbird 142

Memory safety bugs present in Firefox ESR 140.1, Thunderbird ESR 140.1, Firefox 141 and Thunderbird 141. 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. This vulnerability was fixed in Firefox 142, Firefox ESR 140.2, Thunderbird 142, and Thunderbird 140.2.

CVSS 3.1 · 8.1 High EPSS < 1% KEV · Not listed

Vendors

Mozilla

Products

Firefox Firefox Esr Thunderbird

CVE-2025-8042

Sandboxed iframe could start downloads

Firefox for Android allowed a sandboxed iframe without the `allow-downloads` attribute to start downloads. This vulnerability was fixed in Firefox 141.

CVSS 3.1 · 9.8 Critical EPSS < 1% KEV · Not listed

Vendors

Google Mozilla

Products

Android Firefox

CVE-2025-8364

Address bar spoofing using an blob URI on Firefox for Android

A crafted URL using a blob: URI could have hidden the true origin of the page, resulting in a potential spoofing attack. *Note: This issue only affected Android operating systems. Other operating systems are unaffected.*. This vulnerability was fixed in Firefox 141.

CVSS 3.1 · 4.3 Medium EPSS < 1% KEV · Not listed

Vendors

Google Mozilla

Products

Android Firefox

CVE-2025-54144

Internal Firefox open-text URL scheme allowed loading of arbitrary URLs

The URL scheme used by Firefox to facilitate searching of text queries could incorrectly allow attackers to open arbitrary website URLs or internal pages if a user was tricked into clicking a link. This vulnerability was fixed in Firefox for iOS 141.

CVSS 3.1 · 5.4 Medium EPSS < 1% KEV · Not listed

Vendors

Apple Mozilla

Products

Ios Firefox Firefox For Ios

CVE-2025-54145

Scanning a malicious URL utilizing Firefox's open-text scheme with the QR code scanner could load arbitrary websites

The QR scanner could allow arbitrary websites to be opened if a user was tricked into scanning a malicious link that leveraged Firefox's open-text URL scheme. This vulnerability was fixed in Firefox for iOS 141.

CVSS 3.1 · 9.1 Critical EPSS < 1% KEV · Not listed

Vendors

Apple Mozilla

Products

Ios Firefox Firefox For Ios

CVE-2025-55030

Content-Disposition headers incorrectly ignored for some MIME types

Firefox for iOS would not respect a Content-Disposition header of type Attachment and would incorrectly display the content inline rather than downloading, potentially allowing for XSS attacks. This vulnerability was fixed in Firefox for iOS 142.

CVSS 3.1 · 6.1 Medium EPSS < 1% KEV · Not listed

Vendors

Apple Mozilla

Products

Ios Firefox Firefox For Ios

CVE-2025-55028

JavaScript alerts could impede UI interaction or allow denial of service attacks

Malicious scripts utilizing repetitive JavaScript alerts could prevent client user interaction in some scenarios and allow for denial of service attacks. This vulnerability was fixed in Firefox for iOS 142.

CVSS 3.1 · 6.5 Medium EPSS < 1% KEV · Not listed

Vendors

Apple Mozilla

Products

Ios Firefox Firefox For Ios

CVE-2025-55031

Passkey phishing within Bluetooth range

Malicious pages could use Firefox for iOS to pass FIDO: links to the OS and trigger the hybrid passkey transport. An attacker within Bluetooth range could have used this to trick the user into using their passkey to log the attacker's computer into the target account. This vulnerability was fixed in Firefox for iOS 142 and Focus for iOS 142.

CVSS 3.1 · 9.8 Critical EPSS < 1% KEV · Not listed

Vendors

Apple Mozilla

Products

Ios Firefox Firefox Focus and 2 more

CVE-2025-55029

Malicious scripts could spam popups for denial of service attacks

Malicious scripts could bypass the popup blocker to spam new tabs, potentially resulting in denial of service attacks. This vulnerability was fixed in Firefox for iOS 142.

CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed

Vendors

Apple Mozilla

Products

Ios Firefox Firefox For Ios

CVE-2025-55032

Focus incorrectly ignores Content-Disposition headers for some MIME types

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. This vulnerability was fixed in Focus for iOS 142.

CVSS 3.1 · 6.1 Medium EPSS < 1% KEV · Not listed

Vendors

Apple Mozilla

Products

Ios Firefox Focus Focus For Ios

CVE-2006-0749

Firefox Tag Order Vulnerability

nsHTMLContentSink.cpp in Mozilla Firefox and Thunderbird 1.x before 1.5 and 1.0.x before 1.0.8, Mozilla Suite before 1.7.13, and SeaMonkey before 1.0 allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary code via unknown vectors involving a "particular sequence of HTML tags" that leads to memory corruption.

CVSS 2.0 · 9.3 Critical EPSS 10.5% KEV · Not listed

Vendors

Mozilla Redhat

Products

Firefox Mozilla Suite Seamonkey and 2 more

CVE-2026-2784

Mitigation bypass in the DOM: Security component

Mitigation bypass in the DOM: Security component. This vulnerability was fixed in Firefox 148, Firefox ESR 140.8, Thunderbird 148, and Thunderbird 140.8.

CVSS 3.1 · 9.8 Critical EPSS < 1% KEV · Not listed

Vendors

Mozilla

Products

Firefox Firefox Esr Thunderbird

CVE-2026-2779

Incorrect boundary conditions in the Networking: JAR component

Incorrect boundary conditions in the Networking: JAR component. This vulnerability was fixed in Firefox 148, Firefox ESR 140.8, Thunderbird 148, and Thunderbird 140.8.

CVSS 3.1 · 9.8 Critical EPSS < 1% KEV · Not listed

Vendors

Mozilla

Products

Firefox Firefox Esr Thunderbird