CVE-2026-13839Network attack vector

Same-origin policy bypass via CSS processing

Published Jun 30, 2026 · Updated Jun 30, 2026

Same-origin policy bypass in CSS in Google Chrome before 150.0.7871.47 allows remote attackers to cross origin boundaries via crafted HTML. The public Chromium issue is access-restricted, and Google's advisory does not disclose which CSS processing path mishandles the crafted document. Exploitation requires a user to load attacker-controlled HTML; public records do not identify the cross-origin action enabled beyond the policy bypass.

CVSS severityUnavailable
Unscored
EPSS probability0.24%
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 CSS in Google Chrome before 150.0.7871.47 allows remote attackers to cross origin boundaries via crafted HTML. The public Chromium issue is access-restricted, and Google's advisory does not disclose which CSS processing path mishandles the crafted document. Exploitation requires a user to load attacker-controlled HTML; public records do not identify the cross-origin action enabled beyond the policy bypass.

The record

CVE
CVE-2026-13839
Published
Jun 30, 2026
Updated
Jun 30, 2026
Vendor
Go standard library
Product
Google Chrome
Classifications
T1204.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 30, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 30, 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=150.0.7871.47 <150.0.7871.47

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Go standard library · Google Chromeversion=150.0.7871.47 <150.0.7871.47

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.

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

T1204.001User Execution: Malicious Link

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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