CVE-2026-12460Network attack vector

Site-isolation bypass via crafted PDF

Published Jun 17, 2026 · Updated Jun 17, 2026

Site-isolation bypass in Google Chrome before 149.0.7827.155 allows remote attackers with a compromised renderer to cross site boundaries. File System Access applies insufficient policy enforcement to crafted PDF content, but the restricted Chromium issue does not disclose the faulty function or condition. Exploitation requires prior renderer compromise and user interaction with the PDF; no browser-sandbox escape or service interruption is reported.

CVSS severity4.2
Medium
EPSS probability0.15%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Site-isolation bypass in Google Chrome before 149.0.7827.155 allows remote attackers with a compromised renderer to cross site boundaries. File System Access applies insufficient policy enforcement to crafted PDF content, but the restricted Chromium issue does not disclose the faulty function or condition. Exploitation requires prior renderer compromise and user interaction with the PDF; no browser-sandbox escape or service interruption is reported.

The record

CVE
CVE-2026-12460
Published
Jun 17, 2026
Updated
Jun 17, 2026
Vendor
Go standard library
Product
Google Chrome
Classifications
CWE-284, T1211
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

4.2CISA-ADPCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/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-284Improper Access Control
T1211Exploitation for Defense Evasion

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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