CVE-2026-86016Public exploitNetwork attack vectorHinoki check available

Local-file disclosure via unsanitized YAML frontmatter

Published Oct 13, 2026 · Updated Oct 13, 2026

Stored XSS in VNote before 4.3.0 allows remote attackers to read local notes when an attacker-supplied Markdown note is opened. In src/data/extra/web/js/markdownit.js, the frontmatter callback assigns untrusted metadata to preNode.innerHTML before protectFromXss sanitization runs. Opening the note executes JavaScript in the file:// viewer context, where enabled remote requests allow reachable local note contents to be transmitted without further interaction.

CVSS severity8.2
High
EPSS probability0.22%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Stored XSS in VNote before 4.3.0 allows remote attackers to read local notes when an attacker-supplied Markdown note is opened. In src/data/extra/web/js/markdownit.js, the frontmatter callback assigns untrusted metadata to preNode.innerHTML before protectFromXss sanitization runs. Opening the note executes JavaScript in the file:// viewer context, where enabled remote requests allow reachable local note contents to be transmitted without further interaction.

The record

CVE
CVE-2026-86016
Published
Oct 13, 2026
Updated
Oct 13, 2026
Vendor
VNoteX Team
Product
VNote
Classifications
CWE-79, T1204.002, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 13, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 13, 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=< 4.3.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

VNoteX Team · VNoteversion=< 4.3.0

Published CVSS scores

8.2GitHub_MCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/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.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

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

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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