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
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Cross-site scripting (CVE-ID: CVE-2021-43861)
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.