GHSA-w32g-5hqp-gg6q: Mermaid Cross-Site Scripting Vulnerability

HIGH
Share
CWE-79
Published
Advisory Summary

GHSA-w32g-5hqp-gg6q is a HIGH cross-site scripting vulnerability (CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')) affecting Mermaid libraries in the npm ecosystem. The issue involves cross-site scripting in mermaid. Remediation is available by upgrading affected packages to version 8.2.3.

GHSA-w32g-5hqp-gg6q at a Glance

CVE Identifier N/A
GHSA Identifier GHSA-w32g-5hqp-gg6q
Severity HIGH
CVSS v3.1 Base Score N/A
CWE Classification CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Affected Product Mermaid
Package Ecosystem npm
Published Date
Last Updated

How to Fix GHSA-w32g-5hqp-gg6q

To remediate this vulnerability, upgrade all affected Mermaid dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

mermaid fixed: 8.2.3 
npm install mermaid@8.2.3
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

npm ls mermaid

How to Check if You Are Affected

To determine whether your Node.js application is affected by GHSA-w32g-5hqp-gg6q, inspect your project dependencies using npm:

npm ls mermaid

Analyze the terminal output to locate any version of Mermaid in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 8.2.3), your application is affected.

Note: The npm ls mermaid command inspects dependencies declared in your package.json and lockfile; it does not perform automated runtime dynamic scanning.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting'), where the product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. In Mermaid, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

Versions of `mermaid` prior to 8.2.3 are vulnerable to Cross-Site Scripting. If malicious input such as `A["<img src=invalid onerror=alert('XSS')></img>"] ` is provided to the application, it will execute the code instead of rendering it as text due to improper output encoding. ## Recommendation Upgrade to version 8.2.3 or later

GHSA-w32g-5hqp-gg6q Affected Mermaid Versions

1 component(s)
Fixed Versions:
8.2.3
Product / Package Ecosystem Affected Versions Fixed Version
mermaid
npm/mermaid
npm
< 8.2.3
8.2.3

References

Mermaid Source Repository REPOSITORY
https://github.com/knsv/mermaid/issues/847
Mermaid Source Repository REPOSITORY
https://github.com/knsv/mermaid
www.npmjs.com/advisories/751 WEB
https://www.npmjs.com/advisories/751

Frequently Asked Questions

What is GHSA-w32g-5hqp-gg6q?
GHSA-w32g-5hqp-gg6q is a security vulnerability in Mermaid involving Cross-Site Scripting in mermaid under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting').
Which Mermaid versions are affected?
Affected versions include releases prior to 8.2.3 across affected packages: mermaid.
What version fixes GHSA-w32g-5hqp-gg6q?
Upgrading to 8.2.3 (or the latest patched release for your respective branch) resolves the vulnerability.
Is mermaid affected?
Yes, mermaid is affected in releases prior to 8.2.3. Upgrade your dependency to 8.2.3 or later.
What CWE is associated with GHSA-w32g-5hqp-gg6q?
GHSA-w32g-5hqp-gg6q is classified under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') (The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.).
How can I check npm dependencies for GHSA-w32g-5hqp-gg6q?
Run the dependency tree command: 'npm ls mermaid'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-w32g-5hqp-gg6q",
  "modified" : "2021-09-27T13:34:07Z",
  "published" : "2020-09-02T15:41:41Z",
  "aliases" : [ ],
  "summary" : "Cross-Site Scripting in mermaid",
  "details" : "Versions of `mermaid` prior to 8.2.3 are vulnerable to Cross-Site Scripting. If malicious input  such as `A[\"<img src=invalid onerror=alert('XSS')></img>\"] ` is provided to the application, it will execute the code instead of rendering it as text due to improper output encoding.\n\n\n## Recommendation\n\nUpgrade to version 8.2.3 or later",
  "severity" : [ ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "mermaid"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "8.2.3"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/knsv/mermaid/issues/847"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/knsv/mermaid"
  }, {
    "type" : "WEB",
    "url" : "https://www.npmjs.com/advisories/751"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-79" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2020-08-31T18:34:30Z",
    "nvd_published_at" : null
  }
}