CVE-2026-57101

Restricted Mode bypass via Mermaid notebook rendering

Published Jul 14, 2026 · Updated Jul 14, 2026

Cross-site scripting in Visual Studio Code before 1.128.1 allows local users to bypass Restricted Mode through a crafted notebook. The Mermaid notebook renderer assigns rendered diagram HTML to a temporary element's innerHTML, parsing attacker-controlled markup in the notebook webview. Opening untrusted notebook content is required; injected content can read or modify data available to the editor, but no availability impact is reported.

CVSS severity7.1
High
EPSS probability0.48%
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 Visual Studio Code before 1.128.1 allows local users to bypass Restricted Mode through a crafted notebook. The Mermaid notebook renderer assigns rendered diagram HTML to a temporary element's innerHTML, parsing attacker-controlled markup in the notebook webview. Opening untrusted notebook content is required; injected content can read or modify data available to the editor, but no availability impact is reported.

The record

CVE
CVE-2026-57101
Published
Jul 14, 2026
Updated
Jul 14, 2026
Vendor
Microsoft
Product
Visual Studio Code
Classifications
CWE-79, T1204.002, T1203
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 14, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 14, 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 <1.128.1

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Microsoft · Visual Studio Codeversion=1.0.0 <1.128.1

Published CVSS scores

6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
7.1Microsoft CorporationCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/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)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1204.002User Execution: Malicious File
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

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Your stack

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