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Incorrect sanitisation function leads to `XSS` in mermaid

High severity GitHub Reviewed Published Dec 29, 2021 in mermaid-js/mermaid • Updated Feb 3, 2023

Package

npm mermaid (npm)

Affected versions

< 8.13.8

Patched versions

8.13.8

Description

Impact

Malicious diagrams can contain javascript code that can be run at diagram readers machines.

Patches

The users should upgrade to version 8.13.8

Workarounds

You need to upgrade in order to avoid this issue.

References

@knsv knsv published to mermaid-js/mermaid Dec 29, 2021
Published by the National Vulnerability Database Dec 30, 2021
Reviewed Jan 6, 2022
Published to the GitHub Advisory Database Jan 6, 2022
Last updated Feb 3, 2023

Severity

High

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
High
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

EPSS score

0.058%
(26th percentile)

Weaknesses

CVE ID

CVE-2021-43861

GHSA ID

GHSA-p3rp-vmj9-gv6v

Source code

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