CVE-2026-30048: @developer.notchatbot/webchat Cross-Site Scripting Vulnerability

MODERATE
Advisory Identifier: GHSA-w3vx-52j6-9fjp
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CWE-79
Published
Advisory Summary

CVE-2026-30048 is a MODERATE cross-site scripting vulnerability (CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')) affecting @developer.notchatbot/webchat libraries in the npm ecosystem. The issue involves notchatbot webchat has a stored cross-site scripting (xss) vulnerability. Remediation is available in the latest vendor maintenance releases.

CVE-2026-30048 at a Glance

CVE Identifier CVE-2026-30048
GHSA Identifier GHSA-w3vx-52j6-9fjp
Severity MODERATE
CVSS v3.1 Base Score N/A
CWE Classification CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Affected Product @developer.notchatbot/webchat
Package Ecosystem npm
Published Date
Last Updated

How to Fix CVE-2026-30048

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

@developer.notchatbot/webchat fixed: Latest secure release 
npm install @developer.notchatbot/webchat@Latest secure release
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 @developer.notchatbot/webchat

How to Check if You Are Affected

To determine whether your Node.js application is affected by CVE-2026-30048, inspect your project dependencies using npm:

npm ls @developer.notchatbot/webchat

Analyze the terminal output to locate any version of @developer.notchatbot/webchat in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than the patched release), your application is affected.

Note: The npm ls @developer.notchatbot/webchat 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 @developer.notchatbot/webchat, 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

A stored cross-site scripting (XSS) vulnerability exists in the NotChatbot WebChat widget thru 1.4.4. User-supplied input is not properly sanitized before being stored and rendered in the chat conversation history. This allows an attacker to inject arbitrary JavaScript code which is executed when the chat history is reloaded. The issue is reproducible across multiple independent implementations of the widget, indicating that the vulnerability resides in the product itself rather than in a specific website configuration.

CVE-2026-30048 Affected @developer.notchatbot/webchat Versions

1 component(s)
Product / Package Ecosystem Affected Versions Fixed Version
@developer.notchatbot/webchat
npm/@developer.notchatbot/webchat
npm
≤ 1.5.0

References

NVD — CVE-2026-30048 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-30048
app.unpkg.com/@developer.notchatb... WEB
https://app.unpkg.com/@developer.notchatbot/webchat@1.4.4
@developer.notchatbot/webchat Source Repository REPOSITORY
https://gist.github.com/0xN4no/0601f398942a29259d217ea650f694fe
@developer.notchatbot/webchat Source Repository REPOSITORY
https://github.com/0xN4no/CVE-2026-30048
www.npmjs.com/package/@developer.... WEB
https://www.npmjs.com/package/@developer.notchatbot/webchat

Frequently Asked Questions

What is CVE-2026-30048?
CVE-2026-30048 is a security vulnerability in @developer.notchatbot/webchat involving NotChatbot WebChat has a stored cross-site scripting (XSS) vulnerability under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting').
Which @developer.notchatbot/webchat versions are affected?
Affected versions include releases prior to current release patches across affected packages: @developer.notchatbot/webchat.
What version fixes CVE-2026-30048?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
Is @developer.notchatbot/webchat affected?
Yes, @developer.notchatbot/webchat is affected in releases prior to Latest secure release. Upgrade your dependency to Latest secure release or later.
What CWE is associated with CVE-2026-30048?
CVE-2026-30048 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-2026-30048?
Run the dependency tree command: 'npm ls @developer.notchatbot/webchat'. 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-w3vx-52j6-9fjp",
  "modified" : "2026-03-19T12:50:46Z",
  "published" : "2026-03-18T18:31:18Z",
  "aliases" : [ "CVE-2026-30048" ],
  "summary" : "NotChatbot WebChat has a stored cross-site scripting (XSS) vulnerability",
  "details" : "A stored cross-site scripting (XSS) vulnerability exists in the NotChatbot WebChat widget thru 1.4.4. User-supplied input is not properly sanitized before being stored and rendered in the chat conversation history. This allows an attacker to inject arbitrary JavaScript code which is executed when the chat history is reloaded. The issue is reproducible across multiple independent implementations of the widget, indicating that the vulnerability resides in the product itself rather than in a specific website configuration.",
  "severity" : [ {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "@developer.notchatbot/webchat"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "last_affected" : "1.5.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-30048"
  }, {
    "type" : "WEB",
    "url" : "https://app.unpkg.com/@developer.notchatbot/webchat@1.4.4"
  }, {
    "type" : "WEB",
    "url" : "https://gist.github.com/0xN4no/0601f398942a29259d217ea650f694fe"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/0xN4no/CVE-2026-30048"
  }, {
    "type" : "WEB",
    "url" : "https://www.npmjs.com/package/@developer.notchatbot/webchat"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-79" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-03-19T12:50:46Z",
    "nvd_published_at" : "2026-03-18T18:16:27Z"
  }
}