CVE-2026-84123Network attack vector

Privilege escalation via WebGPU use-after-free

Published Sep 1, 2026 · Updated Sep 2, 2026

WebGPU use-after-free in Mozilla Firefox and Thunderbird releases allows remote attackers to escalate application privileges. Mozilla identifies the Graphics: WebGPU component as the locus, but the restricted bug report leaves the affected object and erroneous operation undisclosed. Exploitation requires WebGPU processing in a browser or browser-like context; Thunderbird disables scripting while reading email, limiting that delivery path.

CVSS severity8.8
High
EPSS probability0.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

WebGPU use-after-free in Mozilla Firefox and Thunderbird releases allows remote attackers to escalate application privileges. Mozilla identifies the Graphics: WebGPU component as the locus, but the restricted bug report leaves the affected object and erroneous operation undisclosed. Exploitation requires WebGPU processing in a browser or browser-like context; Thunderbird disables scripting while reading email, limiting that delivery path.

The record

CVE
CVE-2026-84123
Published
Sep 1, 2026
Updated
Sep 2, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
T1068
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 1, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 2, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

8.8TenableCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
10.0TenableAV:N/AC:L/Au:N/C:C/I:C/A:C

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1068Exploitation for Privilege Escalation

Public exploit references

No public exploit references are available in this record.

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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