CVE-2026-77490Network attack vector

Content spoofing via cross-site scripting

Published Sep 11, 2026 · Updated Sep 11, 2026

Cross-site scripting in Microsoft Edge (Chromium-based) before 151.0.4129.107 allows remote attackers to spoof content over a network. Microsoft has not published the affected rendering locus or the operation that fails to neutralize attacker-controlled page content. The public record identifies no prerequisite beyond network delivery and bounds the documented consequence to spoofing rather than data access or service interruption.

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

What happened

Cross-site scripting in Microsoft Edge (Chromium-based) before 151.0.4129.107 allows remote attackers to spoof content over a network. Microsoft has not published the affected rendering locus or the operation that fails to neutralize attacker-controlled page content. The public record identifies no prerequisite beyond network delivery and bounds the documented consequence to spoofing rather than data access or service interruption.

The record

CVE
CVE-2026-77490
Published
Sep 11, 2026
Updated
Sep 11, 2026
Vendor
Microsoft
Product
Microsoft Edge (Chromium-based)
Classifications
CWE-79
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 11, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 11, 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=1.0.0.0 <151.0.4129.107

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Microsoft · Microsoft Edge (Chromium-based)version=1.0.0.0 <151.0.4129.107

Published CVSS scores

No CVSS assessment is available in this record.

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

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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