SB2021122919 - Cross-site scripting in mermaid

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Main Vulnerability Database SB2021122919

SB2021122919 - Cross-site scripting in mermaid

Published: December 29, 2021 Updated: April 24, 2026

Security Bulletin ID SB2021122919
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Data manipulation

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Cross-site scripting (CVE-ID: CVE-2021-43861)

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

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:U/U:Green


The vulnerability allows a remote attacker to execute arbitrary script code in the victim's browser.

The vulnerability exists due to cross-site scripting in the diagram rendering functionality when processing malicious diagrams. A remote attacker can supply a specially crafted diagram to execute arbitrary script code in the victim's browser.

User interaction is required to view the crafted diagram.


Remediation

Install update from vendor's website.

References