CVE-2025-67438: @sync in/server Cross-Site Scripting Vulnerability

MODERATE
Advisory Identifier: GHSA-9jmq-xgjm-p8c2
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CWE-79
Published
Advisory Summary

CVE-2025-67438 is a MODERATE cross-site scripting vulnerability (CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')) affecting @sync in/server libraries in the npm ecosystem. The issue involves sync-in server has a stored cross-site scripting (xss) vulnerability. Remediation is available by upgrading affected packages to version 1.9.3.

CVE-2025-67438 at a Glance

CVE Identifier CVE-2025-67438
GHSA Identifier GHSA-9jmq-xgjm-p8c2
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 @sync in/server
Package Ecosystem npm
Published Date
Last Updated

How to Fix CVE-2025-67438

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

@sync-in/server fixed: 1.9.3 
npm install @sync-in/server@1.9.3
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 @sync-in/server

How to Check if You Are Affected

To determine whether your Node.js application is affected by CVE-2025-67438, inspect your project dependencies using npm:

npm ls @sync-in/server

Analyze the terminal output to locate any version of @sync in/server in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 1.9.3), your application is affected.

Note: The npm ls @sync-in/server 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 @sync in/server, 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 in Sync-in Server before 1.9.3 allows an authenticated attacker to execute arbitrary JavaScript in a victim's browser. By uploading a crafted SVG file containing a malicious payload, an attacker can access and exfiltrate sensitive information, including the user's session cookies.

CVE-2025-67438 Affected @sync in/server Versions

1 component(s)
Fixed Versions:
1.9.3
Product / Package Ecosystem Affected Versions Fixed Version
@sync-in/server
npm/@sync-in/server
npm
< 1.9.3
1.9.3

References

NVD — CVE-2025-67438 NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-67438
Security Fix Commit FIX COMMIT
https://github.com/Sync-in/server/commit/a6276d067725637310e4e83a3eee337aae81f439
@sync in/server Source Repository REPOSITORY
https://gist.github.com/x0root/86db30af91bb0e1707eb7e57a049b6ad
@sync in/server Source Repository REPOSITORY
https://github.com/Sync-in/server
@sync in/server Release RELEASE
https://github.com/Sync-in/server/releases/tag/v1.9.3

Frequently Asked Questions

What is CVE-2025-67438?
CVE-2025-67438 is a security vulnerability in @sync in/server involving Sync-in Server has a stored cross-site scripting (XSS) vulnerability under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting').
Which @sync in/server versions are affected?
Affected versions include releases prior to 1.9.3 across affected packages: @sync-in/server.
What version fixes CVE-2025-67438?
Upgrading to 1.9.3 (or the latest patched release for your respective branch) resolves the vulnerability.
Is @sync-in/server affected?
Yes, @sync-in/server is affected in releases prior to 1.9.3. Upgrade your dependency to 1.9.3 or later.
What CWE is associated with CVE-2025-67438?
CVE-2025-67438 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-2025-67438?
Run the dependency tree command: 'npm ls @sync-in/server'. 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-9jmq-xgjm-p8c2",
  "modified" : "2026-02-20T21:15:36Z",
  "published" : "2026-02-20T18:31:33Z",
  "aliases" : [ "CVE-2025-67438" ],
  "summary" : "Sync-in Server has a stored cross-site scripting (XSS) vulnerability",
  "details" : "A Stored Cross-Site Scripting (XSS) vulnerability in Sync-in Server before 1.9.3 allows an authenticated attacker to execute arbitrary JavaScript in a victim's browser. By uploading a crafted SVG file containing a malicious payload, an attacker can access and exfiltrate sensitive information, including the user's session cookies.",
  "severity" : [ {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "@sync-in/server"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "1.9.3"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2025-67438"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/Sync-in/server/commit/a6276d067725637310e4e83a3eee337aae81f439"
  }, {
    "type" : "WEB",
    "url" : "https://gist.github.com/x0root/86db30af91bb0e1707eb7e57a049b6ad"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/Sync-in/server"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/Sync-in/server/releases/tag/v1.9.3"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-79" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-02-20T21:15:36Z",
    "nvd_published_at" : "2026-02-20T16:22:02Z"
  }
}