CVE-2025-13634

Local Mark-of-the-Web bypass via crafted HTML

Published Dec 2, 2025 · Updated Dec 3, 2025

Authentication bypass in Google Chrome before 143.0.7499.41 on Windows allows local users to bypass Mark of the Web via crafted HTML. Google identifies the Downloads component, but the restricted Chromium issue leaves the exact operation that omits or defeats the mark undisclosed. The attack requires local access and user interaction with crafted HTML, after which downloaded content lacks the Windows origin mark used by security checks.

CVSS severity4.4
Medium
EPSS probability0.16%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in Google Chrome before 143.0.7499.41 on Windows allows local users to bypass Mark of the Web via crafted HTML. Google identifies the Downloads component, but the restricted Chromium issue leaves the exact operation that omits or defeats the mark undisclosed. The attack requires local access and user interaction with crafted HTML, after which downloaded content lacks the Windows origin mark used by security checks.

The record

CVE
CVE-2025-13634
Published
Dec 2, 2025
Updated
Dec 3, 2025
Vendor
Google Cloud
Product
Google Chrome
Classifications
CWE-290, T1553.005
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 2, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 3, 2025Record 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=143.0.7499.41 <143.0.7499.41

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Google Cloud · Google Chromeversion=143.0.7499.41 <143.0.7499.41

Published CVSS scores

4.4CISA-ADPCVSS:3.1/AV:L/AC:L/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)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-290Authentication Bypass by Spoofing
T1553.005Mark-of-the-Web Bypass

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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