CVE-2020-6456

Site isolation bypass via crafted clipboard contents

Published Apr 13, 2020 · Updated Aug 4, 2024

Insufficient input validation in Google Chrome before 81.0.4044.92 allows local users to bypass site isolation via crafted clipboard contents. Google has not published the exact clipboard code locus or the validation operation that accepts the crafted contents. Exploitation requires crafted clipboard contents and user interaction; successful isolation bypass permits cross-site data exposure without reported modification or service interruption.

CVSS severity6.5
Medium
EPSS probability1.42%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Insufficient input validation in Google Chrome before 81.0.4044.92 allows local users to bypass site isolation via crafted clipboard contents. Google has not published the exact clipboard code locus or the validation operation that accepts the crafted contents. Exploitation requires crafted clipboard contents and user interaction; successful isolation bypass permits cross-site data exposure without reported modification or service interruption.

The record

CVE
CVE-2020-6456
Published
Apr 13, 2020
Updated
Aug 4, 2024
Vendor
Google Cloud
Product
Google Chrome
Classifications
CWE-276, CAPEC-1, CAPEC-81, CAPEC-127
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Apr 13, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record 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=unspecified <81.0.4044.92

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

Google Cloud · Google Chromeversion=unspecified <81.0.4044.92

Published CVSS scores

6.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
4.3NIST NVDAV:N/AC:M/Au:N/C:P/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)
Vectorlocal
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-276Incorrect Default Permissions
CAPEC-1Accessing Functionality Not Properly Constrained by ACLs
CAPEC-81Web Server Logs Tampering
CAPEC-127Directory Indexing

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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