CVE-2025-13992Network attack vector

Site isolation bypass via navigation side channel

Published Dec 3, 2025 · Updated Dec 3, 2025

Side-channel information leakage in Google Chrome before 139.0.7258.66 allows remote attackers to bypass site isolation via crafted HTML. Google identifies Navigation and Loading as the locus but keeps the linked bug details restricted, so the precise leaking operation is undisclosed. Exploitation requires a user to open attacker-controlled HTML; the demonstrated consequence is cross-site information exposure, with no integrity or availability impact reported.

CVSS severity4.7
Medium
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Side-channel information leakage in Google Chrome before 139.0.7258.66 allows remote attackers to bypass site isolation via crafted HTML. Google identifies Navigation and Loading as the locus but keeps the linked bug details restricted, so the precise leaking operation is undisclosed. Exploitation requires a user to open attacker-controlled HTML; the demonstrated consequence is cross-site information exposure, with no integrity or availability impact reported.

The record

CVE
CVE-2025-13992
Published
Dec 3, 2025
Updated
Dec 3, 2025
Vendor
Google Cloud
Product
Google Chrome
Classifications
CWE-1300, CAPEC-189, CAPEC-699, T1189
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 3, 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

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=139.0.7258.66 <139.0.7258.66

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Google Cloud · Google Chromeversion=139.0.7258.66 <139.0.7258.66

Published CVSS scores

4.7CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-1300Improper Protection of Physical Side Channels
CAPEC-189Black Box Reverse Engineering
CAPEC-699Eavesdropping on a Monitor
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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