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TI-2021-19542 Aliases CVE-2021-43721GHSA-8mh9-7j76-5m8p

Leanote 2.7.0 is vulnerable to Cross Site Scripting (XSS) in the markdown type note.

Priority LOW 29CWE-79Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Required
Attack complexity
Low
Impact type
Cross-site scripting
Confidentiality · integrity · availability
Low · Low · None
Fix status
No fix listed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-79.

Summary

Leanote 2.7.0 is vulnerable to Cross Site Scripting (XSS) in the markdown type note. This leads to remote code execution with payload : <video src=x onerror=(function(){require('child_process').exec('calc');})();>

Why it matters now

EPSS 0.01061 64th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix No fix listed No fixed version in the sources yet

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
——all versions—No fix listedCNA
  • — Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:leanote:leanote:2.7.0:*:*:*:*:*:*:*2.7.0VulnerableLeanote
  • cpe:2.3:a:leanote:leanote:2.7.0:*:*:*:*:*:*:* Versions 2.7.0 Vulnerable ·Leanote

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-43721
  2. 2026-10-03 Alias added: GHSA-8mh9-7j76-5m8p

References

Exploit 1

  • TI-2020-15992 Leanote Desktop through 2.6.2 allows XSS because a note's title is mishandled when the… CVSS 3.1CRITICAL 9.6
  • TI-2020-15991 Leanote Desktop through 2.6.2 allows XSS because a note's title is mishandled during… CVSS 3.1CRITICAL 9.6
  • TI-2018-13119 Leanote 2.6.1 has XSS via the Blog Basic Setting title field, which is mishandled during rendering of the "likes" page. CVSS 3.0MEDIUM 6.1
  • TI-2017-14670 Leanote version <= 2.5 is vulnerable to XSS due to not sanitized input in markdown notes CVSS 3.0MEDIUM 6.1
  • TI-2021-03121 leanote history.js define cross site scripting CVSS 3.1MEDIUM 6.1
  • TI-2019-15945 Leanote prior to version 2.6 is affected by: Cross Site Scripting (XSS). CVSS 3.0MEDIUM 6.1

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences