CVE-2026-58290Network attack vector

Remote code execution via incompatible resource access

Published Jul 3, 2026 · Updated Jul 3, 2026

Type confusion in Microsoft Edge (Chromium-based) before 150.0.4078.48 allows remote attackers to execute code via crafted web content. Microsoft has not disclosed the affected component or how attacker-controlled web content causes an incompatible resource type to be accessed. Exploitation requires user interaction and high-complexity conditions, and successful code runs across the browser security boundary.

CVSS severity7.5
High
EPSS probability0.43%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Type confusion in Microsoft Edge (Chromium-based) before 150.0.4078.48 allows remote attackers to execute code via crafted web content. Microsoft has not disclosed the affected component or how attacker-controlled web content causes an incompatible resource type to be accessed. Exploitation requires user interaction and high-complexity conditions, and successful code runs across the browser security boundary.

The record

CVE
CVE-2026-58290
Published
Jul 3, 2026
Updated
Jul 3, 2026
Vendor
Microsoft
Product
Microsoft Edge (Chromium-based)
Classifications
CWE-843, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 3, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 3, 2026Record 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=1.0.0.0 <150.0.4078.48

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Microsoft · Microsoft Edge (Chromium-based)version=1.0.0.0 <150.0.4078.48

Published CVSS scores

7.5Microsoft CorporationCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:H/A:L

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-843Access of Resource Using Incompatible Type ('Type Confusion')
T1203Exploitation for Client Execution

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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo