CVE-2026-30691: @cyntler/react doc viewer @cyntler/react-doc-viewer's TXTRenderer Fails To Sanitize Vulnerability

MODERATE
Advisory Identifier: GHSA-fvhg-p4hf-79x3
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CVSS 6.1
CWE-79
Published
Advisory Summary

CVE-2026-30691 is a MODERATE (CVSS 6.1) @cyntler/react-doc-viewer's txtrenderer fails to sanitize vulnerability (CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')) affecting @cyntler/react doc viewer libraries in the npm ecosystem. The issue involves @cyntler/react-doc-viewer's txtrenderer fails to sanitize file content and explicitly casts raw data as a reactnode. Remediation is available in the latest vendor maintenance releases.

CVE-2026-30691 at a Glance

CVE Identifier CVE-2026-30691
GHSA Identifier GHSA-fvhg-p4hf-79x3
Severity MODERATE
CVSS v3.1 Base Score 6.1
CWE Classification CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Affected Product @cyntler/react doc viewer
Package Ecosystem npm
Published Date
Last Updated

Security Impact

CVSS: 6.1

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:C/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 Changed (S:C)
Confidentiality Low (C:L)
Integrity Low (I:L)
Availability None (A:N)

How to Fix CVE-2026-30691

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

@cyntler/react-doc-viewer fixed: Latest secure release 
npm install @cyntler/react-doc-viewer@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 @cyntler/react-doc-viewer

How to Check if You Are Affected

To determine whether your Node.js application is affected by CVE-2026-30691, inspect your project dependencies using npm:

npm ls @cyntler/react-doc-viewer

Analyze the terminal output to locate any version of @cyntler/react doc viewer 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 @cyntler/react-doc-viewer 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 @cyntler/react doc viewer, 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

Cross-Site Scripting (XSS) vulnerability in @cyntler/react-doc-viewer v1.17.1 allows remote attackers to execute arbitrary JavaScript via a crafted .txt file. The TXTRenderer component fails to sanitize file content and explicitly casts raw data as a ReactNode.

CVE-2026-30691 Affected @cyntler/react doc viewer Versions

1 component(s)
Product / Package Ecosystem Affected Versions Fixed Version
@cyntler/react-doc-viewer
npm/@cyntler/react-doc-viewer
npm
≤ 1.17.1

References

NVD — CVE-2026-30691 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-30691
@cyntler/react doc viewer Source Repository REPOSITORY
https://github.com/cyntler/react-doc-viewer/issues/317
@cyntler/react doc viewer Source Repository REPOSITORY
https://github.com/cyntler/react-doc-viewer
@cyntler/react doc viewer Source Repository REPOSITORY
https://github.com/walidriouah/CVE-2026-30691

Frequently Asked Questions

What is CVE-2026-30691?
CVE-2026-30691 is a security vulnerability in @cyntler/react doc viewer involving @cyntler/react-doc-viewer's TXTRenderer fails to sanitize file content and explicitly casts raw data as a ReactNode under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting').
Which @cyntler/react doc viewer versions are affected?
Affected versions include releases prior to current release patches across affected packages: @cyntler/react-doc-viewer.
What version fixes CVE-2026-30691?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
Is @cyntler/react-doc-viewer affected?
Yes, @cyntler/react-doc-viewer is affected in releases prior to Latest secure release. Upgrade your dependency to Latest secure release or later.
What is the CVSS score of CVE-2026-30691?
CVE-2026-30691 has a CVSS v3.1 base score of 6.1 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.
What CWE is associated with CVE-2026-30691?
CVE-2026-30691 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-2026-30691?
Run the dependency tree command: 'npm ls @cyntler/react-doc-viewer'. 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-fvhg-p4hf-79x3",
  "modified" : "2026-06-11T13:28:16Z",
  "published" : "2026-05-20T18:31:36Z",
  "aliases" : [ "CVE-2026-30691" ],
  "summary" : "@cyntler/react-doc-viewer's TXTRenderer fails to sanitize file content and explicitly casts raw data as a ReactNode",
  "details" : "Cross-Site Scripting (XSS) vulnerability in @cyntler/react-doc-viewer v1.17.1 allows remote attackers to execute arbitrary JavaScript via a crafted .txt file. The TXTRenderer component fails to sanitize file content and explicitly casts raw data as a ReactNode.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "@cyntler/react-doc-viewer"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "last_affected" : "1.17.1"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-30691"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/cyntler/react-doc-viewer/issues/317"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/cyntler/react-doc-viewer"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/walidriouah/CVE-2026-30691"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-79" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-06-11T13:28:16Z",
    "nvd_published_at" : "2026-05-20T18:16:26Z"
  }
}