CVE-2023-3672: Webmention.js Cross-Site Scripting Vulnerability

HIGH
Advisory Identifier: GHSA-r54g-4qq6-chxg
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CVSS 7.3
CWE-79
Published
Advisory Summary

CVE-2023-3672 is a HIGH (CVSS 7.3) cross-site scripting vulnerability (CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')) affecting Webmention.js libraries in the npm ecosystem. The issue involves webmention.js cross-site scripting vulnerability. Remediation is available by upgrading affected packages to version 0.5.5.

CVE-2023-3672 at a Glance

CVE Identifier CVE-2023-3672
GHSA Identifier GHSA-r54g-4qq6-chxg
Severity HIGH
CVSS v3.1 Base Score 7.3
CWE Classification CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Affected Product Webmention.js
Package Ecosystem npm
Published Date
Last Updated

Security Impact

CVSS: 7.3

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L).

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

How to Fix CVE-2023-3672

To remediate this vulnerability, upgrade all affected Webmention.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.

webmention.js fixed: 0.5.5 
npm install webmention.js@0.5.5
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 webmention.js

How to Check if You Are Affected

To determine whether your Node.js application is affected by CVE-2023-3672, inspect your project dependencies using npm:

npm ls webmention.js

Analyze the terminal output to locate any version of Webmention.js in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.5.5), your application is affected.

Note: The npm ls webmention.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-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 Webmention.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

webmention.js prior to 0.5.5 is vulnerable to cross-site scripting.

CVE-2023-3672 Affected Webmention.js Versions

1 component(s)
Fixed Versions:
0.5.5
Product / Package Ecosystem Affected Versions Fixed Version
webmention.js
npm/webmention.js
npm
< 0.5.5
0.5.5

References

NVD — CVE-2023-3672 NVD
https://nvd.nist.gov/vuln/detail/CVE-2023-3672
Security Fix Commit FIX COMMIT
https://github.com/plaidweb/webmention.js/commit/3551b66b3e40da37fee89ecf72930c5efdc53011
Webmention.js Source Repository REPOSITORY
https://github.com/PlaidWeb/webmention.js/blob/9457e71433c0d2430bbe767ecc5b5837140d0ee4/static/webmention.js#L330
Webmention.js Source Repository REPOSITORY
https://github.com/plaidweb/webmention.js
huntr.dev/bounties/75cfb7ad-a... WEB
https://huntr.dev/bounties/75cfb7ad-a75f-45ff-8688-32a9c55179aa

Frequently Asked Questions

What is CVE-2023-3672?
CVE-2023-3672 is a security vulnerability in Webmention.js involving webmention.js Cross-site Scripting vulnerability under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting').
Which Webmention.js versions are affected?
Affected versions include releases prior to 0.5.5 across affected packages: webmention.js.
What version fixes CVE-2023-3672?
Upgrading to 0.5.5 (or the latest patched release for your respective branch) resolves the vulnerability.
Is webmention.js affected?
Yes, webmention.js is affected in releases prior to 0.5.5. Upgrade your dependency to 0.5.5 or later.
What is the CVSS score of CVE-2023-3672?
CVE-2023-3672 has a CVSS v3.1 base score of 7.3 (HIGH) with vector string CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L.
What CWE is associated with CVE-2023-3672?
CVE-2023-3672 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 CVE-2023-3672?
Run the dependency tree command: 'npm ls webmention.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-r54g-4qq6-chxg",
  "modified" : "2023-07-14T21:50:30Z",
  "published" : "2023-07-14T12:30:20Z",
  "aliases" : [ "CVE-2023-3672" ],
  "summary" : "webmention.js Cross-site Scripting vulnerability",
  "details" : "webmention.js prior to 0.5.5 is vulnerable to cross-site scripting.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "webmention.js"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.5.5"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2023-3672"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/plaidweb/webmention.js/commit/3551b66b3e40da37fee89ecf72930c5efdc53011"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/PlaidWeb/webmention.js/blob/9457e71433c0d2430bbe767ecc5b5837140d0ee4/static/webmention.js#L330"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/plaidweb/webmention.js"
  }, {
    "type" : "WEB",
    "url" : "https://huntr.dev/bounties/75cfb7ad-a75f-45ff-8688-32a9c55179aa"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-79" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2023-07-14T21:50:30Z",
    "nvd_published_at" : "2023-07-14T10:15:08Z"
  }
}