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Mozilla Firefox ESRSandbox escape due to use-after-free in the DOM: Content Processes component

Risk 80
Severity
9.6
Use After Free
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

Sandbox escape due to use-after-free in the DOM: Content Processes component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17.

First published (updated )
CVE-2026-100762

Mozilla Firefox ESRSandbox escape due to use-after-free in the DOM: Content Processes component

Risk 80
Severity
9.6
Use After Free
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

Sandbox escape due to use-after-free in the DOM: Content Processes component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17.

First published (updated )
CVE-2026-100770

Mozilla Firefox ESRSandbox escape due to use-after-free in the Graphics component

Risk 80
Severity
9.6
Use After Free
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

Sandbox escape due to use-after-free in the Graphics component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17.

First published (updated )
CVE-2026-100786

Mozilla FirefoxSandbox escape in the Security: Process Sandboxing component

Risk 80
Severity
9.6
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

Sandbox escape in the Security: Process Sandboxing component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 153.4, and Firefox 157.

First published (updated )
CVE-2026-100760

Mozilla Firefox ESRSandbox escape in the Graphics component

Risk 80
Severity
9.6
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

Sandbox escape in the Graphics component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17.

First published (updated )
CVE-2026-100775

Mozilla Firefox ESRSandbox escape in the DOM: Navigation component

Risk 80
Severity
9.6
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

Sandbox escape in the DOM: Navigation component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17.

First published (updated )
CVE-2026-100758

Mozilla FirefoxMitigation bypass in the DOM: Security component

Risk 80
Severity
9.6
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

Mitigation bypass in the DOM: Security component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 153.4, and Firefox 157.

First published (updated )
CVE-2026-100829

Mozilla Firefox ESRSandbox escape due to use-after-free in the DOM: Core & HTML component

Risk 80
Severity
9.6
Use After Free
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

Sandbox escape due to use-after-free in the DOM: Core & HTML component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, and Firefox ESR 140.17.

First published (updated )
CVE-2026-100811

Mozilla Firefox ESRSandbox escape due to incorrect boundary conditions in the XPCOM component

Risk 80
Severity
9.6
Buffer Overflow
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

Sandbox escape due to incorrect boundary conditions in the XPCOM component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17.

First published (updated )
CVE-2026-100819

Mozilla FirefoxMitigation bypass in the Bookmarks & History component

Risk 80
Severity
9.6
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

Mitigation bypass in the Bookmarks & History component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 153.4, and Firefox 157.

First published (updated )
CVE-2026-100828

Mozilla Firefox ESRSandbox escape due to use-after-free in the Widget: Gtk component

Risk 80
Severity
9.6
Use After Free
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

Sandbox escape due to use-after-free in the Widget: Gtk component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, and Firefox ESR 140.17.

First published (updated )
CVE-2026-100818

Mozilla Firefox ESRSandbox escape due to use-after-free in the DOM: Core & HTML component

Risk 80
Severity
9.6
Use After Free
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

Sandbox escape due to use-after-free in the DOM: Core & HTML component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17.

First published (updated )
CVE-2026-100778

Mozilla FirefoxSandbox escape in the XUL component

Risk 80
Severity
9.6
Input Validation
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

Sandbox escape in the XUL component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 153.4, and Firefox 157.

First published (updated )
CVE-2026-100787

Mozilla FirefoxSandbox escape in the DOM: Core & HTML component

Risk 58
Severity
9.6
EPSS
0.16%
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

Sandbox escape in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 156, Firefox ESR 115.41, Firefox ESR 140.16, Firefox ESR 153.3, Thunderbird 156, Thunderbird 140.16, and Thunderbird 153.3.

First published (updated )
CVE-2026-92018

Mozilla FirefoxSandbox escape due to invalid pointer in the Graphics component

Risk 58
Severity
9.6
EPSS
0.16%
Buffer Overflow
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

Sandbox escape due to invalid pointer in the Graphics component. This vulnerability was fixed in Firefox 156, Firefox ESR 140.16, Firefox ESR 153.3, Thunderbird 156, Thunderbird 140.16, and Thunderbird 153.3.

First published (updated )
CVE-2026-92032

Mozilla FirefoxSandbox escape due to incorrect boundary conditions in the Graphics component

Risk 58
Severity
9.6
EPSS
0.15%
Buffer Overflow
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

Sandbox escape due to incorrect boundary conditions in the Graphics component. This vulnerability was fixed in Thunderbird 140.17, Firefox 156, Firefox ESR 153.3, Thunderbird 156, Thunderbird 153.3, Firefox ESR 115.42, and Firefox ESR 140.17.

First published (updated )
CVE-2026-92035

FirefoxMitigation bypass in the Remote Settings Client component

Risk 47
Severity
9.1
EPSS
0.16%
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Mitigation bypass in the Remote Settings Client component. This vulnerability was fixed in Firefox 156, Firefox ESR 153.3, Thunderbird 156, and Thunderbird 153.3.

First published (updated )
CVE-2026-92038

Mozilla FirefoxSandbox escape due to incorrect boundary conditions in the Widget: Win32 component

Risk 55
Severity
9
EPSS
0.15%
Buffer Overflow
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H

Sandbox escape due to incorrect boundary conditions in the Widget: Win32 component. This vulnerability was fixed in Firefox 156, Firefox ESR 153.3, Thunderbird 156, and Thunderbird 153.3.

First published (updated )
CVE-2026-92048

FirefoxMitigation bypass in the DOM: Networking component

Risk 47
Severity
9.1
EPSS
0.16%
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Mitigation bypass in the DOM: Networking component. This vulnerability was fixed in Firefox 156, Firefox ESR 153.3, Thunderbird 156, and Thunderbird 153.3.

First published (updated )
CVE-2026-92041

Mozilla FirefoxSandbox escape due to incorrect boundary conditions in the WebRTC component

Risk 58
Severity
9.6
EPSS
0.15%
Buffer Overflow
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

Sandbox escape due to incorrect boundary conditions in the WebRTC component. This vulnerability was fixed in Firefox 156, Firefox ESR 153.3, Thunderbird 156, and Thunderbird 153.3.

First published (updated )
CVE-2026-92045

Mozilla FirefoxMitigation bypass in the Enterprise Policies component

Risk 47
Severity
9.1
EPSS
0.15%
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Mitigation bypass in the Enterprise Policies component. This vulnerability was fixed in Firefox 156, Firefox ESR 153.3, Thunderbird 156, and Thunderbird 153.3.

First published (updated )
CVE-2026-92057

Mozilla FirefoxIncorrect boundary conditions in the DOM: Editor component

Risk 56
Severity
9.3
EPSS
0.14%
Buffer Overflow
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Incorrect boundary conditions in the DOM: Editor component. This vulnerability was fixed in Firefox 156, Firefox ESR 153.3, Thunderbird 156, and Thunderbird 153.3.

First published (updated )
CVE-2026-92059

Mozilla FirefoxSandbox escape due to incorrect boundary conditions in the Widget: Win32 component

Risk 58
Severity
9.6
EPSS
0.14%
Buffer Overflow
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

Sandbox escape due to incorrect boundary conditions in the Widget: Win32 component. This vulnerability was fixed in Firefox 156, Firefox ESR 153.3, Thunderbird 156, and Thunderbird 153.3.

First published (updated )
CVE-2026-92071

Mozilla FirefoxMitigation bypass in the Networking component

Risk 47
Severity
9.1
EPSS
0.16%
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Mitigation bypass in the Networking component. This vulnerability was fixed in Firefox 156, Firefox ESR 153.3, Thunderbird 156, and Thunderbird 153.3.

First published (updated )
CVE-2026-92075

Mozilla FirefoxMitigation bypass in the Widget: Win32 component

Risk 47
Severity
9.1
EPSS
0.15%
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Mitigation bypass in the Widget: Win32 component. This vulnerability was fixed in Firefox 156, Firefox ESR 153.3, Thunderbird 156, and Thunderbird 153.3.

First published (updated )
CVE-2026-92079

Mozilla ThunderbirdAmbiguous parsing of mail headers

Risk 61
Severity
9.8
EPSS
0.18%
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

A maliciously constructed mail header could lead to multiple fields being parsed as one, or potential memory safety violations.

1 / 2
Source: Mozilla
First published (updated )
CVE-2026-92238

Mozilla ThunderbirdOut-of-bounds read in IMAP response parser

Risk 47
Severity
9.1
EPSS
0.21%
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

A malicious or compromised IMAP server can trigger an out-of-bounds read in the IMAP response parser by sending an untagged ' ID' response, crashing Thunderbird. The affected parsing path is reachable before authentication.

1 / 2
Source: Mozilla
First published (updated )
CVE-2026-92240

Mozilla FirefoxSandbox escape due to use-after-free in the DOM: Security component

Risk 80
Severity
9.6
Use After Free
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

Sandbox escape due to use-after-free in the DOM: Security component. This vulnerability was fixed in Firefox 155, Firefox ESR 115.40, Firefox ESR 140.15, Firefox ESR 153.2, Thunderbird 155, Thunderbird 140.15, and Thunderbird 153.2.

First published (updated )
CVE-2026-84121

Mozilla FirefoxClickjacking issue in the DOM: Events component

Risk 86
Severity
9.8
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Clickjacking issue in the DOM: Events component. This vulnerability was fixed in Firefox 155, Firefox ESR 153.2, Thunderbird 155, and Thunderbird 153.2.

First published (updated )
CVE-2026-84139

Mozilla FirefoxOther issue in the Profile Backup component

Risk 86
Severity
9.8
Infoleak
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Other issue in the Profile Backup component. This vulnerability was fixed in Firefox 155, Firefox ESR 153.2, Thunderbird 155, and Thunderbird 153.2.

First published (updated )
CVE-2026-84134

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