CVE-2026-5878Network attack vector

UI spoofing via crafted HTML page

Published Apr 8, 2026 · Updated Apr 8, 2026

Incorrect security UI in Blink in Google Chrome before 147.0.7727.55 allows remote attackers to spoof browser UI via crafted HTML. Google identifies Blink as the affected component, but the restricted Chromium issue leaves the incorrect rendering or trust-boundary operation undisclosed. A user must open the attacker's page; it can misrepresent security-relevant interface information, with no reported data disclosure or code execution.

CVSS severity4.3
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

Incorrect security UI in Blink in Google Chrome before 147.0.7727.55 allows remote attackers to spoof browser UI via crafted HTML. Google identifies Blink as the affected component, but the restricted Chromium issue leaves the incorrect rendering or trust-boundary operation undisclosed. A user must open the attacker's page; it can misrepresent security-relevant interface information, with no reported data disclosure or code execution.

The record

CVE
CVE-2026-5878
Published
Apr 8, 2026
Updated
Apr 8, 2026
Vendor
Go standard library
Product
Google Chrome
Classifications
CWE-451, T1036
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 8, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 8, 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=147.0.7727.55 <147.0.7727.55

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Go standard library · Google Chromeversion=147.0.7727.55 <147.0.7727.55

Published CVSS scores

4.3CISA-ADPCVSS: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 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-451User Interface (UI) Misrepresentation of Critical Information
T1036Masquerading

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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