CVE-2026-87453Network attack vector

Information disclosure via BackgroundFetch confused deputy

Published Sep 9, 2026 · Updated Sep 9, 2026

Information disclosure in BackgroundFetch in Google Chrome before 153.0.8010.36 allows remote attackers to leak sensitive information via crafted HTML. Google identifies a confused deputy in BackgroundFetch but has not published the request flow or authorization operation that misuses browser-process authority. Exploitation requires an already-compromised renderer, and the published impact is limited to disclosure.

CVSS severityUnavailable
Unscored
EPSS probability0.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in BackgroundFetch in Google Chrome before 153.0.8010.36 allows remote attackers to leak sensitive information via crafted HTML. Google identifies a confused deputy in BackgroundFetch but has not published the request flow or authorization operation that misuses browser-process authority. Exploitation requires an already-compromised renderer, and the published impact is limited to disclosure.

The record

CVE
CVE-2026-87453
Published
Sep 9, 2026
Updated
Sep 9, 2026
Vendor
Google Cloud
Product
Google Chrome
Classifications
CWE-441
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-441Unintended Proxy or Intermediary ('Confused Deputy')

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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