CVE-2026-15505Public exploitNetwork attack vector

Local-file theft via unsanitized YAML frontmatter

Published Jul 12, 2026 · Updated Jul 12, 2026

Stored XSS in VNoteX Team VNote 3.20.0 through 3.20.1 allows context-dependent attackers to read local files via a malicious Markdown note. The YAML frontmatter callback in markdownit.js assigns p_metaData to preNode.innerHTML without sanitization, bypassing protectFromXss. Opening an attacker-supplied note executes JavaScript in the file:// viewer, where local-file access and remote requests enable data exfiltration.

CVSS severity8.2
High
EPSS probability0.33%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in VNoteX Team VNote 3.20.0 through 3.20.1 allows context-dependent attackers to read local files via a malicious Markdown note. The YAML frontmatter callback in markdownit.js assigns p_metaData to preNode.innerHTML without sanitization, bypassing protectFromXss. Opening an attacker-supplied note executes JavaScript in the file:// viewer, where local-file access and remote requests enable data exfiltration.

The record

CVE
CVE-2026-15505
Published
Jul 12, 2026
Updated
Jul 12, 2026
Vendor
VNoteX Team
Product
VNote
Classifications
CWE-79, CWE-94, T1204.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 12, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 12, 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=3.20.0
  2. Affected versionversion=3.20.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

VNoteX Team · VNoteversion=3.20.0; version=3.20.1

Published CVSS scores

3.5VulDB CNACVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N
3.5VulDB CNACVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N
4.0VulDB CNAAV:N/AC:L/Au:S/C:N/I:P/A:N
8.2VNoteX Team GitHub Security AdvisoryCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N
2.0VulDB CNACVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P

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-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
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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