CVE-2025-65716Public exploitNetwork attack vector

JavaScript execution via same-origin preview iframe

Published Feb 16, 2026 · Updated Feb 16, 2026

Code injection in Markdown Preview Enhanced 0.8.18 allows remote attackers to execute JavaScript through a crafted Markdown file. The preview renderer places attacker-controlled HTML into an iframe configured to run embedded scripts with same-origin privileges. Exploitation requires a user to open the file in the extension; the script can probe localhost services and exfiltrate collected data.

CVSS severity8.8
High
EPSS probability0.71%
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 0.8.18 allows remote attackers to execute JavaScript through a crafted Markdown file. The preview renderer places attacker-controlled HTML into an iframe configured to run embedded scripts with same-origin privileges. Exploitation requires a user to open the file in the extension; the script can probe localhost services and exfiltrate collected data.

The record

CVE
CVE-2025-65716
Published
Feb 16, 2026
Updated
Feb 16, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-94, T1204.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 16, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 16, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

8.8CISA-ADPCVSS:3.1/AV:N/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.

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 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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