CVE-2020-6433Public exploitNetwork attack vector

Extension navigation bypass via session-history restoration

Published Apr 13, 2020 · Updated Aug 4, 2024

Insufficient policy enforcement in Google Chrome before 81.0.4044.92 allows remote attackers to bypass extension navigation restrictions. When a crafted page opens an extension resource excluded from web_accessible_resources, changes the new window to another page, and goes back, Chrome loads the originally blocked resource from session history. Successful exploitation requires the user to open and click the crafted page and an installed extension with a non-public resource; the demonstrated result is unauthorized loading of that resource.

CVSS severity4.3
Medium
EPSS probability1.66%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Insufficient policy enforcement in Google Chrome before 81.0.4044.92 allows remote attackers to bypass extension navigation restrictions. When a crafted page opens an extension resource excluded from web_accessible_resources, changes the new window to another page, and goes back, Chrome loads the originally blocked resource from session history. Successful exploitation requires the user to open and click the crafted page and an installed extension with a non-public resource; the demonstrated result is unauthorized loading of that resource.

The record

CVE
CVE-2020-6433
Published
Apr 13, 2020
Updated
Aug 4, 2024
Vendor
Google Cloud
Product
Google Chrome
Classifications
Unavailable
Attack vector
network
Privileges
unauthenticated

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 vectornetwork
Required privilegesunauthenticated

What is affected?

Google Cloud · Google Chromeversion=unspecified <81.0.4044.92

Published CVSS scores

4.3NIST NVDAV:N/AC:M/Au:N/C:N/I:P/A:N
4.3NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

No sourced classifications are available.

Public exploit references

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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