CVE-2026-12459Network attack vector

Universal script injection via cross-world SerialPort cache

Published Jun 17, 2026 · Updated Jun 17, 2026

Universal cross-site scripting in Google Chrome before 149.0.7827.155 allows remote attackers to inject scripts or HTML through a crafted page. Serial's per-frame cache reused SerialPort and WritableStream objects across V8 execution worlds, letting the page retrieve an extension-world pending abort promise and pollute its prototype. Exploitation requires a user to open the crafted page while an isolated extension world holds the affected Serial promise; impact is limited to script or HTML injection in the browser context.

CVSS severity6.1
Medium
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Universal cross-site scripting in Google Chrome before 149.0.7827.155 allows remote attackers to inject scripts or HTML through a crafted page. Serial's per-frame cache reused SerialPort and WritableStream objects across V8 execution worlds, letting the page retrieve an extension-world pending abort promise and pollute its prototype. Exploitation requires a user to open the crafted page while an isolated extension world holds the affected Serial promise; impact is limited to script or HTML injection in the browser context.

The record

CVE
CVE-2026-12459
Published
Jun 17, 2026
Updated
Jun 17, 2026
Vendor
Go standard library
Product
Google Chrome
Classifications
CWE-79, T1189
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 17, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 17, 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=149.0.7827.155 <149.0.7827.155

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Go standard library · Google Chromeversion=149.0.7827.155 <149.0.7827.155

Published CVSS scores

6.1CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/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-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
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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