CVE-2020-24807: Socket.io file File Restriction Bypass Vulnerability

HIGH
Advisory Identifier: GHSA-6495-8jvh-f28x
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CVSS 7.8
CWE-20
Published
Advisory Summary

CVE-2020-24807 is a HIGH (CVSS 7.8) file restriction bypass vulnerability (CWE-20: Improper Input Validation) affecting Socket.io file libraries in the npm ecosystem. The issue involves file restriction bypass in socket.io-file. Remediation is available in the latest vendor maintenance releases.

CVE-2020-24807 at a Glance

CVE Identifier CVE-2020-24807
GHSA Identifier GHSA-6495-8jvh-f28x
Severity HIGH
CVSS v3.1 Base Score 7.8
CWE Classification CWE-20: Improper Input Validation
Affected Product Socket.io file
Package Ecosystem npm
Published Date
Last Updated

Security Impact

CVSS: 7.8

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

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

How to Fix CVE-2020-24807

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

socket.io-file fixed: Latest secure release 
npm install socket.io-file@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 socket.io-file

How to Check if You Are Affected

To determine whether your Node.js application is affected by CVE-2020-24807, inspect your project dependencies using npm:

npm ls socket.io-file

Analyze the terminal output to locate any version of Socket.io file 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 socket.io-file 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-20: Improper Input Validation, where the product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. In Socket.io file, 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

All versions of `socket.io-file`are vulnerable to a file restriction bypass. The validation for valid file types only happens on the client-side, which allows an attacker to intercept the Websocket request post-validation and alter the `name` value to upload any file types. No fix is currently available. Consider using an alternative package until a fix is made available.

CVE-2020-24807 Affected Socket.io file Versions

1 component(s)
Product / Package Ecosystem Affected Versions Fixed Version
socket.io-file
npm/socket.io-file
npm
≤ 2.0.31

References

NVD — CVE-2020-24807 NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-24807
Socket.io file Source Repository REPOSITORY
https://github.com/rico345100/socket.io-file
www.npmjs.com/advisories/1564 WEB
https://www.npmjs.com/advisories/1564

Frequently Asked Questions

What is CVE-2020-24807?
CVE-2020-24807 is a security vulnerability in Socket.io file involving File restriction bypass in socket.io-file under CWE-20: Improper Input Validation.
Which Socket.io file versions are affected?
Affected versions include releases prior to current release patches across affected packages: socket.io-file.
What version fixes CVE-2020-24807?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
Is socket.io-file affected?
Yes, socket.io-file 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-2020-24807?
CVE-2020-24807 has a CVSS v3.1 base score of 7.8 (HIGH) with vector string CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.
What CWE is associated with CVE-2020-24807?
CVE-2020-24807 is classified under CWE-20: Improper Input Validation (The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.).
How can I check npm dependencies for CVE-2020-24807?
Run the dependency tree command: 'npm ls socket.io-file'. 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-6495-8jvh-f28x",
  "modified" : "2026-01-22T22:29:16Z",
  "published" : "2020-10-02T15:39:54Z",
  "aliases" : [ "CVE-2020-24807" ],
  "summary" : "File restriction bypass in socket.io-file",
  "details" : "All versions of `socket.io-file`are vulnerable to a file restriction bypass. The validation for valid file types only happens on the client-side, which allows an attacker to intercept the Websocket request post-validation and alter the `name` value to upload any file types.\n\nNo fix is currently available. Consider using an alternative package until a fix is made available.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "socket.io-file"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "last_affected" : "2.0.31"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2020-24807"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/rico345100/socket.io-file"
  }, {
    "type" : "WEB",
    "url" : "https://www.npmjs.com/advisories/1564"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-20" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2020-10-02T15:36:34Z",
    "nvd_published_at" : null
  }
}