CVE-2025-26791: Dompurify Cross-Site Scripting Vulnerability

MODERATE
Advisory Identifier: GHSA-vhxf-7vqr-mrjg
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CVSS 4.5
CWE-79
Published
Advisory Summary

CVE-2025-26791 is a MODERATE (CVSS 4.5) cross-site scripting vulnerability (CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')) affecting Dompurify libraries in the npm ecosystem. The issue involves dompurify allows cross-site scripting (xss). Remediation is available by upgrading affected packages to version 3.2.4.

CVE-2025-26791 at a Glance

CVE Identifier CVE-2025-26791
GHSA Identifier GHSA-vhxf-7vqr-mrjg
Severity MODERATE
CVSS v3.1 Base Score 4.5
CWE Classification CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Affected Product Dompurify
Package Ecosystem npm
Published Date
Last Updated

Security Impact

CVSS: 4.5

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

Attack Vector Local (AV:L)
Attack Complexity High (AC:H)
Privileges Required None (PR:N)
User Interaction None (UI:N)
Scope Changed (S:C)
Confidentiality Low (C:L)
Integrity Low (I:L)
Availability None (A:N)

How to Fix CVE-2025-26791

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

dompurify fixed: 3.2.4 
npm install dompurify@3.2.4
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 dompurify

How to Check if You Are Affected

To determine whether your Node.js application is affected by CVE-2025-26791, inspect your project dependencies using npm:

npm ls dompurify

Analyze the terminal output to locate any version of Dompurify in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 3.2.4), your application is affected.

Note: The npm ls dompurify 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 Dompurify, 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

DOMPurify before 3.2.4 has an incorrect template literal regular expression when SAFE_FOR_TEMPLATES is set to true, sometimes leading to mutation cross-site scripting (mXSS).

CVE-2025-26791 Affected Dompurify Versions

1 component(s)
Fixed Versions:
3.2.4
Product / Package Ecosystem Affected Versions Fixed Version
dompurify
npm/dompurify
npm
< 3.2.4
3.2.4

References

NVD — CVE-2025-26791 NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-26791
Security Fix Commit FIX COMMIT
https://github.com/cure53/DOMPurify/commit/d18ffcb554e0001748865da03ac75dd7829f0f02
ensy.zip/posts/dompurify-323... WEB
https://ensy.zip/posts/dompurify-323-bypass
Dompurify Source Repository REPOSITORY
https://github.com/cure53/DOMPurify
Dompurify Release RELEASE
https://github.com/cure53/DOMPurify/releases/tag/3.2.4
nsysean.github.io/posts/dompurify-323... WEB
https://nsysean.github.io/posts/dompurify-323-bypass

Frequently Asked Questions

What is CVE-2025-26791?
CVE-2025-26791 is a security vulnerability in Dompurify involving DOMPurify allows Cross-site Scripting (XSS) under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting').
Which Dompurify versions are affected?
Affected versions include releases prior to 3.2.4 across affected packages: dompurify.
What version fixes CVE-2025-26791?
Upgrading to 3.2.4 (or the latest patched release for your respective branch) resolves the vulnerability.
Is dompurify affected?
Yes, dompurify is affected in releases prior to 3.2.4. Upgrade your dependency to 3.2.4 or later.
What is the CVSS score of CVE-2025-26791?
CVE-2025-26791 has a CVSS v3.1 base score of 4.5 (MODERATE) with vector string CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N.
What CWE is associated with CVE-2025-26791?
CVE-2025-26791 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-2025-26791?
Run the dependency tree command: 'npm ls dompurify'. 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-vhxf-7vqr-mrjg",
  "modified" : "2025-06-30T14:24:13Z",
  "published" : "2025-02-14T09:31:22Z",
  "aliases" : [ "CVE-2025-26791" ],
  "summary" : "DOMPurify allows Cross-site Scripting (XSS)",
  "details" : "DOMPurify before 3.2.4 has an incorrect template literal regular expression when SAFE_FOR_TEMPLATES is set to true, sometimes leading to mutation cross-site scripting (mXSS).",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "dompurify"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "3.2.4"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2025-26791"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/cure53/DOMPurify/commit/d18ffcb554e0001748865da03ac75dd7829f0f02"
  }, {
    "type" : "WEB",
    "url" : "https://ensy.zip/posts/dompurify-323-bypass"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/cure53/DOMPurify"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/cure53/DOMPurify/releases/tag/3.2.4"
  }, {
    "type" : "WEB",
    "url" : "https://nsysean.github.io/posts/dompurify-323-bypass"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-79" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2025-02-14T18:05:08Z",
    "nvd_published_at" : "2025-02-14T09:15:08Z"
  }
}