CVE-2026-84354Network attack vectorHinoki check available

Sandbox escape via FileSystem authorization failure

Published Sep 1, 2026 · Updated Sep 3, 2026

Incorrect authorization in Google Chrome's FileSystem before 152.0.7977.75 allows remote attackers to execute code outside the sandbox. The public record identifies an authorization failure in FileSystem, but Google has restricted the issue details and has not disclosed the specific check or operation that mishandles the crafted HTML page. Exploitation requires social engineering to induce page interaction; successful exploitation escapes Chrome's sandbox and executes arbitrary code.

CVSS severityUnavailable
Unscored
EPSS probability0.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Incorrect authorization in Google Chrome's FileSystem before 152.0.7977.75 allows remote attackers to execute code outside the sandbox. The public record identifies an authorization failure in FileSystem, but Google has restricted the issue details and has not disclosed the specific check or operation that mishandles the crafted HTML page. Exploitation requires social engineering to induce page interaction; successful exploitation escapes Chrome's sandbox and executes arbitrary code.

The record

CVE
CVE-2026-84354
Published
Sep 1, 2026
Updated
Sep 3, 2026
Vendor
Google Cloud
Product
Google Chrome
Classifications
CWE-863, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 1, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 3, 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?

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

  1. Affected versionversion=152.0.7977.75 <152.0.7977.75

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Google Cloud · Google Chromeversion=152.0.7977.75 <152.0.7977.75

Published CVSS scores

No CVSS assessment is available in this record.

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

CWE-863Incorrect Authorization
T1203Exploitation for Client Execution

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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