CVE-2026-11048Network attack vector

Same-origin policy bypass via malicious extension

Published Jun 4, 2026 · Updated Jun 4, 2026

Origin validation failure in Google Chrome before 149.0.7827.53 allows attackers to bypass the same-origin policy through a malicious extension. The Extensions component incorrectly permits a crafted Chrome extension to cross origin boundaries; Google has not disclosed the specific faulty check or code path. Exploitation requires convincing a user to install the extension, after which it can alter cross-origin state without reported code execution or service interruption.

CVSS severity6.5
Medium
EPSS probability0.16%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Origin validation failure in Google Chrome before 149.0.7827.53 allows attackers to bypass the same-origin policy through a malicious extension. The Extensions component incorrectly permits a crafted Chrome extension to cross origin boundaries; Google has not disclosed the specific faulty check or code path. Exploitation requires convincing a user to install the extension, after which it can alter cross-origin state without reported code execution or service interruption.

The record

CVE
CVE-2026-11048
Published
Jun 4, 2026
Updated
Jun 4, 2026
Vendor
Go standard library
Product
Google Chrome
Classifications
CWE-346, T1176.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 4, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 4, 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=149.0.7827.53 <149.0.7827.53

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Go standard library · Google Chromeversion=149.0.7827.53 <149.0.7827.53

Published CVSS scores

6.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-346Origin Validation Error
T1176.001Browser Extensions

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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