CVE-2026-87434Network attack vector

Origin-policy bypass via missing CORS authorization

Published Sep 9, 2026 · Updated Sep 9, 2026

Missing authorization in CORS in Google Chrome before 153.0.8010.36 allows remote attackers to bypass web origin policy via crafted HTML. The public record identifies CORS as the affected locus but does not disclose which authorization check is omitted or which cross-origin operation proceeds unchecked. Exploitation requires prior renderer compromise and a crafted HTML page; the bounded consequence is bypass of web origin policy.

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

What happened

Missing authorization in CORS in Google Chrome before 153.0.8010.36 allows remote attackers to bypass web origin policy via crafted HTML. The public record identifies CORS as the affected locus but does not disclose which authorization check is omitted or which cross-origin operation proceeds unchecked. Exploitation requires prior renderer compromise and a crafted HTML page; the bounded consequence is bypass of web origin policy.

The record

CVE
CVE-2026-87434
Published
Sep 9, 2026
Updated
Sep 9, 2026
Vendor
Google Cloud
Product
Google Chrome
Classifications
CWE-862, T1203
Attack vector
network
Privileges
Unavailable

Timeline

How it unfolded

  1. Sep 9, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 9, 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=153.0.8010.36 <153.0.8010.36

What conditions does exploitation require?

Attack vectornetwork
Required privilegesUnavailable in this record.

What is affected?

Google Cloud · Google Chromeversion=153.0.8010.36 <153.0.8010.36

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.

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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
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-862Missing 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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