Inkdrop vulnerable to OS command injection


Inkdrop provided by Takuya Matsuyama is a Markdown editor. Inkdrop contains an OS command injection vulnerability (CWE-78).

Eiji Mori of Flatt Security Inc. reported this vulnerability to IPA.
JPCERT/CC coordinated with the developer under Information Security Early Warning Partnership.
CVSS Severity (What is CVSS?)

CVSS V3 Severity:
Base Metrics 7.8 (High) [IPA Score]
  • Attack Vector: Local
  • Attack Complexity: Low
  • Privileges Required: None
  • User Interaction: Required
  • Scope: Unchanged
  • Confidentiality Impact: High
  • Integrity Impact: High
  • Availability Impact: High
CVSS V2 Severity:
Base Metrics 6.8 (Medium) [IPA Score]
  • Access Vector: Network
  • Access Complexity: Medium
  • Authentication: None
  • Confidentiality Impact: Partial
  • Integrity Impact: Partial
  • Availability Impact: Partial
Affected Products

Takuya Matsuyama
  • Inkdrop prior to v5.3.1


If a file or code snippet containing an invalid iframe is loaded into Inkdrop, an arbitrary OS command may be executed on the system where it runs.

[Update the Software]
According to the developers, Inkdrop has an auto-update feature, so affected versions of the product will be updated automatically.
Vendor Information

Takuya Matsuyama
CWE (What is CWE?)

  1. OS Command Injection(CWE-78) [IPA Evaluation]
CVE (What is CVE?)

  1. CVE-2021-20745

  1. JVN : JVN#29949691
Revision History

  • [2021/06/22]
      Web page was published