CVE-2023-53940Public exploit

Code execution via unsanitized Markdown event handlers

Published Dec 18, 2025 · Updated Dec 18, 2025

Code injection in Codigo Markdown Editor 1.0.1 allows attackers to run system commands by opening a crafted Markdown file. A video-source onerror handler executes attacker-controlled JavaScript and passes its command to Node.js child_process. Exploitation requires a user to open the malicious file, after which commands run with the editor process's operating-system privileges.

CVSS severity8.4
High
EPSS probability0.20%
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 Codigo Markdown Editor 1.0.1 allows attackers to run system commands by opening a crafted Markdown file. A video-source onerror handler executes attacker-controlled JavaScript and passes its command to Node.js child_process. Exploitation requires a user to open the malicious file, after which commands run with the editor process's operating-system privileges.

The record

CVE
CVE-2023-53940
Published
Dec 18, 2025
Updated
Dec 18, 2025
Vendor
Alfonz Montelibano
Product
Codigo Markdown Editor
Classifications
CWE-94, T1204.002
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 18, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 18, 2025Record 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=1.0.1

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Alfonz Montelibano · Codigo Markdown Editorversion=1.0.1

Published CVSS scores

8.4VulnCheckCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
7.8VulnCheckCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

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.

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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-94Improper Control of Generation of Code ('Code Injection')
T1204.002Malicious File

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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