CVE-2021-47963Public exploitNetwork attack vector

Code execution via unneutralized Markdown JavaScript

Published May 15, 2026 · Updated May 15, 2026

Stored XSS in AnotherNote ANote 1.0 allows attackers to execute system commands by supplying a malicious Markdown file. ANote's Markdown renderer fails to neutralize embedded JavaScript before displaying the file, allowing script content to invoke operating-system commands inside Electron. Execution requires the file to be opened in the desktop application, and commands run with the victim user's operating-system privileges.

CVSS severity7.2
High
EPSS probability0.47%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Stored XSS in AnotherNote ANote 1.0 allows attackers to execute system commands by supplying a malicious Markdown file. ANote's Markdown renderer fails to neutralize embedded JavaScript before displaying the file, allowing script content to invoke operating-system commands inside Electron. Execution requires the file to be opened in the desktop application, and commands run with the victim user's operating-system privileges.

The record

CVE
CVE-2021-47963
Published
May 15, 2026
Updated
May 15, 2026
Vendor
AnotherNote
Product
ANote
Classifications
CWE-79, T1203, T1204.002
Attack vector
network
Privileges
Unavailable

Timeline

How it unfolded

  1. May 15, 2026CVE publishedPublication date reported by the CVE source.
  2. May 15, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesUnavailable in this record.

What is affected?

AnotherNote · ANoteversion=1.0

Published CVSS scores

5.1VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
7.2VulnCheckCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/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.

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
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1203Exploitation for Client Execution
T1204.002Malicious File

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo