CVE-2026-7351Network attack vector

Cross-origin data disclosure via MHTML race

Published Apr 28, 2026 · Updated Apr 28, 2026

Race condition in MHTML in Google Chrome before 147.0.7727.138 allows remote attackers to leak cross-origin data through a crafted extension. A TOCTOU flaw in MHTMLGenerationManager lets a BFCache race switch the archived page after access is checked; the extension then reads the resulting MHTML file to access chrome://settings DOM. Exploitation requires a user to install the malicious extension, and the reported consequence is data disclosure without integrity or availability impact.

CVSS severity3.1
Low
EPSS probability0.11%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Race condition in MHTML in Google Chrome before 147.0.7727.138 allows remote attackers to leak cross-origin data through a crafted extension. A TOCTOU flaw in MHTMLGenerationManager lets a BFCache race switch the archived page after access is checked; the extension then reads the resulting MHTML file to access chrome://settings DOM. Exploitation requires a user to install the malicious extension, and the reported consequence is data disclosure without integrity or availability impact.

The record

CVE
CVE-2026-7351
Published
Apr 28, 2026
Updated
Apr 28, 2026
Vendor
Go standard library
Product
Google Chrome
Classifications
CWE-362, T1176
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 28, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 28, 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=147.0.7727.138 <147.0.7727.138

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Go standard library · Google Chromeversion=147.0.7727.138 <147.0.7727.138

Published CVSS scores

3.1CISA-ADPCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/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-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
T1176Browser Extensions

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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