CVE-2021-23443: Edge.js Cross-Site Scripting Vulnerability

MODERATE
Advisory Identifier: GHSA-55r9-7mf8-m382
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CVSS 5.4
CWE-843 CWE-79
Published
Advisory Summary

CVE-2021-23443 is a MODERATE (CVSS 5.4) cross-site scripting vulnerability (CWE-843: Access of Resource Using Incompatible Type ('Type Confusion')) affecting Edge.js libraries in the npm ecosystem. The issue involves cross-site scripting in edge.js. Remediation is available by upgrading affected packages to version 5.3.2.

CVE-2021-23443 at a Glance

CVE Identifier CVE-2021-23443
GHSA Identifier GHSA-55r9-7mf8-m382
Severity MODERATE
CVSS v3.1 Base Score 5.4
CWE Classification CWE-843: Access of Resource Using Incompatible Type ('Type Confusion')
Affected Product Edge.js
Package Ecosystem npm
Published Date
Last Updated

Security Impact

CVSS: 5.4

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
User Interaction Required (UI:R)
Scope Unchanged (S:U)
Confidentiality Low (C:L)
Integrity Low (I:L)
Availability None (A:N)

How to Fix CVE-2021-23443

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

edge.js fixed: 5.3.2 
npm install edge.js@5.3.2
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 edge.js

How to Check if You Are Affected

To determine whether your Node.js application is affected by CVE-2021-23443, inspect your project dependencies using npm:

npm ls edge.js

Analyze the terminal output to locate any version of Edge.js in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 5.3.2), your application is affected.

Note: The npm ls edge.js 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-843: Access of Resource Using Incompatible Type ('Type Confusion'), where the product allocates or initializes a resource such as a pointer, object, or variable using one type, but it later accesses that resource using a type that is incompatible with the original type. In Edge.js, 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

Edge is a logical and batteries included template engine for Node.js. This affects the package edge.js before 5.3.2. A type confusion vulnerability can be used to bypass input sanitization when the input to be rendered is an array (instead of a string or a SafeValue), even if `{{ }}` are used.

CVE-2021-23443 Affected Edge.js Versions

1 component(s)
Fixed Versions:
5.3.2
Product / Package Ecosystem Affected Versions Fixed Version
edge.js
npm/edge.js
npm
< 5.3.2
5.3.2

References

NVD — CVE-2021-23443 NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-23443
Security Fix Commit FIX COMMIT
https://github.com/edge-js/edge/commit/fa2c7fde86327aeae232752e89a6e37e2e469e21
Edge.js Source Repository REPOSITORY
https://github.com/edge-js/edge
snyk.io/vuln/snyk-js-edgejs... WEB
https://snyk.io/vuln/SNYK-JS-EDGEJS-1579556

Frequently Asked Questions

What is CVE-2021-23443?
CVE-2021-23443 is a security vulnerability in Edge.js involving Cross-site Scripting in edge.js under CWE-843: Access of Resource Using Incompatible Type ('Type Confusion').
Which Edge.js versions are affected?
Affected versions include releases prior to 5.3.2 across affected packages: edge.js.
What version fixes CVE-2021-23443?
Upgrading to 5.3.2 (or the latest patched release for your respective branch) resolves the vulnerability.
Is edge.js affected?
Yes, edge.js is affected in releases prior to 5.3.2. Upgrade your dependency to 5.3.2 or later.
What is the CVSS score of CVE-2021-23443?
CVE-2021-23443 has a CVSS v3.1 base score of 5.4 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N.
What CWE is associated with CVE-2021-23443?
CVE-2021-23443 is classified under CWE-843: Access of Resource Using Incompatible Type ('Type Confusion') (The product allocates or initializes a resource such as a pointer, object, or variable using one type, but it later accesses that resource using a type that is incompatible with the original type.).
How can I check npm dependencies for CVE-2021-23443?
Run the dependency tree command: 'npm ls edge.js'. 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-55r9-7mf8-m382",
  "modified" : "2023-09-11T16:20:48Z",
  "published" : "2021-09-22T20:36:46Z",
  "aliases" : [ "CVE-2021-23443" ],
  "summary" : "Cross-site Scripting in edge.js",
  "details" : "Edge is a logical and batteries included template engine for Node.js. This affects the package edge.js before 5.3.2. A type confusion vulnerability can be used to bypass input sanitization when the input to be rendered is an array (instead of a string or a SafeValue), even if `{{ }}` are used.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "edge.js"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "5.3.2"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-23443"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/edge-js/edge/commit/fa2c7fde86327aeae232752e89a6e37e2e469e21"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/edge-js/edge"
  }, {
    "type" : "WEB",
    "url" : "https://snyk.io/vuln/SNYK-JS-EDGEJS-1579556"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-79", "CWE-843" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-09-22T14:25:18Z",
    "nvd_published_at" : "2021-09-21T17:15:00Z"
  }
}