CVE-2025-14860Public exploitNetwork attack vector

Browser-tab crash via stale PresShell dereference

Published Dec 18, 2025 · Updated Dec 18, 2025

Use-after-free in Firefox before 146.0.1 allows remote attackers to crash a browser tab through a crafted web page. Destruction of a focused embed element lets FocusManager create a new DocAccessible with a dying PresShell, which NotificationController later dereferences. Accessibility must be active and the page must receive a click or keyboard focus; the demonstrated consequence is a tab crash.

CVSS severity9.8
Critical
EPSS probability0.32%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in Firefox before 146.0.1 allows remote attackers to crash a browser tab through a crafted web page. Destruction of a focused embed element lets FocusManager create a new DocAccessible with a dying PresShell, which NotificationController later dereferences. Accessibility must be active and the page must receive a click or keyboard focus; the demonstrated consequence is a tab crash.

The record

CVE
CVE-2025-14860
Published
Dec 18, 2025
Updated
Dec 18, 2025
Vendor
Mozilla
Product
Firefox
Classifications
CWE-416, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 18, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 18, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=unspecified <146.0.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Mozilla · Firefoxversion=unspecified <146.0.1

Published CVSS scores

9.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-416Use After Free
T1203Exploitation for Client Execution

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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