CVE-2026-11422Public exploit

Arbitrary file writes via WaveDrom eval injection

Published Jun 5, 2026 · Updated Jun 5, 2026

Code injection in Markdown Preview Enhanced before 0.8.28 allows attackers to write arbitrary local files through crafted Markdown. The WaveDrom renderer passes raw fenced-block text to window.eval(), while preserved WaveDrom script tags and unrestricted webview message dispatch expose the extension host's updateMarkdown file-write path. Exploitation requires a user to open the document and render its preview; no script-execution setting is required, and the write can target paths outside the workspace.

CVSS severity7.1
High
EPSS probability0.16%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Code injection in Markdown Preview Enhanced before 0.8.28 allows attackers to write arbitrary local files through crafted Markdown. The WaveDrom renderer passes raw fenced-block text to window.eval(), while preserved WaveDrom script tags and unrestricted webview message dispatch expose the extension host's updateMarkdown file-write path. Exploitation requires a user to open the document and render its preview; no script-execution setting is required, and the write can target paths outside the workspace.

The record

CVE
CVE-2026-11422
Published
Jun 5, 2026
Updated
Jun 5, 2026
Vendor
Yiyi Wang
Product
Markdown Preview Enhanced
Classifications
CWE-95, T1566.001
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 5, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 5, 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=0 <0.8.27

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Yiyi Wang · Markdown Preview Enhancedversion=0 <0.8.27
Yiyi Wang · Crossnoteversion=0 <0.9.28

Published CVSS scores

7.1VulnCheckCVSS: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 exploitPublished

Weakness, pattern, technique

CWE-95Improper Neutralization of Directives in Dynamically Evaluated Code ('Eval Injection')
T1566.001Spearphishing Attachment

Public exploit references

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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