CVE-2025-9866Network attack vector

CSP bypass via crafted HTML page

Published Sep 3, 2025 · Updated Feb 26, 2026

Protection mechanism failure in Google Chrome before 140.0.7339.80 allows remote attackers to bypass CSP via a crafted HTML page. Google identifies the Extensions component but has not published the faulty operation because the Chromium issue remains restricted. Exploitation requires a user to open the crafted page and permits the page to evade the affected content-security restriction.

CVSS severity8.8
High
EPSS probability0.36%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Protection mechanism failure in Google Chrome before 140.0.7339.80 allows remote attackers to bypass CSP via a crafted HTML page. Google identifies the Extensions component but has not published the faulty operation because the Chromium issue remains restricted. Exploitation requires a user to open the crafted page and permits the page to evade the affected content-security restriction.

The record

CVE
CVE-2025-9866
Published
Sep 3, 2025
Updated
Feb 26, 2026
Vendor
Google Cloud
Product
Google Chrome
Classifications
CWE-693, T1189
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 3, 2025CVE publishedPublication date reported by the CVE source.
  2. Feb 26, 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=140.0.7339.80 <140.0.7339.80

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Google Cloud · Google Chromeversion=140.0.7339.80 <140.0.7339.80

Published CVSS scores

8.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

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 exploitUnconfirmed

Weakness, pattern, technique

CWE-693Protection Mechanism Failure
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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