CVE-2026-9115Network attack vector

Same-origin policy bypass via Service Worker enforcement failure

Published May 20, 2026 · Updated May 20, 2026

Same-origin policy bypass in Google Chrome before 148.0.7778.179 allows remote attackers to cross origin boundaries via crafted HTML. The Service Worker component fails to enforce origin separation while processing attacker-controlled page content; Google has not disclosed the affected code path or exact policy check. Exploitation is remote and unauthenticated but requires a user to open the crafted page, with no reported integrity or availability consequence.

CVSS severity4.3
Medium
EPSS probability0.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Same-origin policy bypass in Google Chrome before 148.0.7778.179 allows remote attackers to cross origin boundaries via crafted HTML. The Service Worker component fails to enforce origin separation while processing attacker-controlled page content; Google has not disclosed the affected code path or exact policy check. Exploitation is remote and unauthenticated but requires a user to open the crafted page, with no reported integrity or availability consequence.

The record

CVE
CVE-2026-9115
Published
May 20, 2026
Updated
May 20, 2026
Vendor
Go standard library
Product
Google Chrome
Classifications
CWE-693, T1189
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 20, 2026CVE publishedPublication date reported by the CVE source.
  2. May 20, 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=148.0.7778.179 <148.0.7778.179

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Go standard library · Google Chromeversion=148.0.7778.179 <148.0.7778.179

Published CVSS scores

4.3CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/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 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-693Protection Mechanism Failure
T1189Drive-by Compromise

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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