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CVE-2026-84123

Privilege escalation due to use-after-free in the Graphics: WebGPU component

HIGH
8.8
CVSS Score
Published: September 1, 2026 at 12:18 PM UTC
Updated: September 2, 2026 at 03:12 PM UTC
2 products affected across 1 vendorFirefoxThunderbird

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Severity
HIGH8.8
Exploit prediction
EPSS 0.4%
SSVC
No known exploit

Description

Privilege escalation due to use-after-free in the Graphics: WebGPU component. This vulnerability was fixed in Firefox 155 and Firefox ESR 153.2.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Firefox· Mozilla
95%
v < 153.2.0154.0.0 ≤ v < 155.0.0
Vendor states this is fixed in 153.2 (unaffected)
Affected range stops below 153.2.0, so it looks safe — our inference, not a vendor statement
Vendor states this is fixed in 155 (unaffected)
Affected range stops below 155.0.0, so it looks safe — our inference, not a vendor statement
Thunderbird· Mozilla
95%
v < 153.2.0154.0 ≤ v < 155.0
Vendor states this is fixed in 153.2 (unaffected)
Affected range stops below 153.2.0, so it looks safe — our inference, not a vendor statement
Vendor states this is fixed in 155 (unaffected)
Affected range stops below 155.0, so it looks safe — our inference, not a vendor statement

References (5)

Permissions Required
Source: cverecord
https://bugzilla.mozilla.org/show_bug.cgi?id=2060047
Vendor Advisory
Source: cverecord
https://www.mozilla.org/security/advisories/mfsa2026-82/
Vendor Advisory
Source: cverecord
https://www.mozilla.org/security/advisories/mfsa2026-85/
Vendor Advisory
Source: cverecord
https://www.mozilla.org/security/advisories/mfsa2026-86/
Vendor Advisory
Source: cverecord
https://www.mozilla.org/security/advisories/mfsa2026-88/

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8.8HIGHCISA-ADP
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusANALYZED
CWE
CWE-416

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