Description
Privilege escalation in the DOM: Notifications component. This vulnerability was fixed in Firefox 146, Firefox ESR 115.31, Firefox ESR 140.6, Thunderbird 146, and Thunderbird 140.6.
Published: 2025-12-09
Score: 8.8 High
EPSS: < 1% Very Low
KEV: No
Impact: Privilege escalation via browser notifications
Action: Immediate Patch
AI Analysis

Impact

The flaw lies in the DOM Notifications component of Mozilla Firefox and Thunderbird. It allows a malicious web page that invokes the Notifications API to bypass normal access controls and elevate its privileges within the browser’s execution context. Based on the description, it is inferred that the attacker can exploit the bug simply by hosting a site that triggers a notification request, thereby gaining higher privileges that can affect the local user’s data or enable additional malicious behaviour.

Affected Systems

Mozilla Firefox versions older than 146, Firefox ESR releases older than 115.31 and 140.6, Mozilla Thunderbird versions older than 146, and Thunderbird ESR releases earlier than 140.6 are affected.

Risk and Exploitability

The CVSS score of 8.8 indicates high severity, while the EPSS score of less than 1% indicates a low but nonzero exploitation probability. The vulnerability is not listed in the CISA KEV catalog. The likely attack vector is a malicious site that invokes the Notifications API, exploiting insufficient validation or permissions within the browser.

Generated by OpenCVE AI on April 22, 2026 at 03:51 UTC.

Remediation

No vendor fix or workaround currently provided.

OpenCVE Recommended Actions

  • Upgrade to Mozilla Firefox 146 or newer (or ESR 115.31 or newer) and to Mozilla Thunderbird 146 or newer (or ESR 140.6 or newer).
  • Disable the Notifications API in the browser’s settings (e.g., via about:config or site permissions) until the patch is applied.
  • Use trusted extensions, such as content blockers, to suppress or filter notification requests from untrusted origins as a temporary measure.

Generated by OpenCVE AI on April 22, 2026 at 03:51 UTC.

Tracking

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Advisories
Source ID Title
Debian DLA Debian DLA DLA-4401-1 firefox-esr security update
Debian DLA Debian DLA DLA-4405-1 thunderbird security update
Debian DSA Debian DSA DSA-6078-1 firefox-esr security update
Debian DSA Debian DSA DSA-6081-1 thunderbird security update
Ubuntu USN Ubuntu USN USN-7991-1 Thunderbird vulnerabilities
History

Mon, 13 Apr 2026 15:00:00 +0000

Type Values Removed Values Added
Description Privilege escalation in the DOM: Notifications component. This vulnerability affects Firefox < 146, Firefox ESR < 115.31, Firefox ESR < 140.6, Thunderbird < 146, and Thunderbird < 140.6. Privilege escalation in the DOM: Notifications component. This vulnerability was fixed in Firefox 146, Firefox ESR 115.31, Firefox ESR 140.6, Thunderbird 146, and Thunderbird 140.6.

Wed, 10 Dec 2025 20:45:00 +0000

Type Values Removed Values Added
First Time appeared Mozilla thunderbird
Weaknesses NVD-CWE-noinfo
CPEs cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*
cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:*
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:-:*:*:*
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:esr:*:*:*
Vendors & Products Mozilla thunderbird

Wed, 10 Dec 2025 18:00:00 +0000

Type Values Removed Values Added
First Time appeared Mozilla
Mozilla firefox
Mozilla firefox Esr
Vendors & Products Mozilla
Mozilla firefox
Mozilla firefox Esr

Wed, 10 Dec 2025 14:45:00 +0000

Type Values Removed Values Added
Description Privilege escalation in the DOM: Notifications component. This vulnerability affects Firefox < 146, Firefox ESR < 115.31, and Firefox ESR < 140.6. Privilege escalation in the DOM: Notifications component. This vulnerability affects Firefox < 146, Firefox ESR < 115.31, Firefox ESR < 140.6, Thunderbird < 146, and Thunderbird < 140.6.
References

Wed, 10 Dec 2025 00:15:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

 threat_severity

Important

Tue, 09 Dec 2025 16:15:00 +0000

Type Values Removed Values Added
Metrics cvssV3_1

{'score': 8.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H'}

ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Tue, 09 Dec 2025 13:45:00 +0000

Type Values Removed Values Added
Description Privilege escalation in the DOM: Notifications component. This vulnerability affects Firefox < 146, Firefox ESR < 115.31, and Firefox ESR < 140.6.
Title Privilege escalation in the DOM: Notifications component
References

Subscriptions

Mozilla Firefox Firefox Esr Thunderbird
cve-icon MITRE

Status: PUBLISHED

Assigner: mozilla

Published:

Updated: 2026-04-13T14:25:31.606Z

Reserved: 2025-12-09T13:37:55.768Z

Link: CVE-2025-14323

cve-icon Vulnrichment

Updated: 2025-12-09T15:24:14.635Z

cve-icon NVD

Status : Modified

Published: 2025-12-09T16:17:39.700

Modified: 2026-04-13T15:16:45.220

Link: CVE-2025-14323

cve-icon Redhat

Severity : Important

Publid Date: 2025-12-09T13:37:56Z

Links: CVE-2025-14323 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-04-22T04:00:07Z

Weaknesses