CVE-2025-53791Network attack vector

Iframe sandbox bypass via improper access control

Published Sep 5, 2025 · Updated Feb 20, 2026

Improper access control in Microsoft Edge (Chromium-based) before 140.0.3485.54 allows remote attackers to bypass an iframe sandbox. A crafted page causes the browser's iframe sandbox enforcement to fail, allowing framed content to interact with its parent DOM. Exploitation requires user interaction and crosses the intended DOM boundary, with no reported code execution or service interruption.

CVSS severity4.7
Medium
EPSS probability0.39%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper access control in Microsoft Edge (Chromium-based) before 140.0.3485.54 allows remote attackers to bypass an iframe sandbox. A crafted page causes the browser's iframe sandbox enforcement to fail, allowing framed content to interact with its parent DOM. Exploitation requires user interaction and crosses the intended DOM boundary, with no reported code execution or service interruption.

The record

CVE
CVE-2025-53791
Published
Sep 5, 2025
Updated
Feb 20, 2026
Vendor
Microsoft
Product
Microsoft Edge (Chromium-based)
Classifications
CWE-284, T1189
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 5, 2025CVE publishedPublication date reported by the CVE source.
  2. Feb 20, 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 <140.0.3485.54

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Microsoft · Microsoft Edge (Chromium-based)version=1.0.0.0 <140.0.3485.54

Published CVSS scores

4.7Microsoft CorporationCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/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-284Improper Access Control
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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