CVE-2020-21146: Feehi/cms Cross-Site Scripting Vulnerability

MODERATE
Advisory Identifier: GHSA-v762-47vh-j7q3
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CVSS 6.1
CWE-79
Published
Advisory Summary

CVE-2020-21146 is a MODERATE (CVSS 6.1) cross-site scripting vulnerability (CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')) affecting Feehi/cms libraries in the Packagist ecosystem. The issue involves feehi cms vulnerable to cross-site scripting in username field. Remediation is available by upgrading affected packages to version 2.0.8.1.

CVE-2020-21146 at a Glance

CVE Identifier CVE-2020-21146
GHSA Identifier GHSA-v762-47vh-j7q3
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 Feehi/cms
Package Ecosystem Packagist
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-2020-21146

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

feehi/cms fixed: 2.0.8.1 
Upgrade feehi/cms to 2.0.8.1
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

inspect dependencies for feehi/cms

How to Check if You Are Affected

To determine whether your application is affected by CVE-2020-21146, inspect your project dependencies for Feehi/cms:

inspect dependencies for feehi/cms

Analyze the terminal output to locate any version of Feehi/cms in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 2.0.8.1), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

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 Feehi/cms, 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

Feehi CMS 2.0.8 is affected by a cross-site scripting (XSS) vulnerability. When the user name is inserted as JavaScript code, browsing the post will trigger the XSS.

CVE-2020-21146 Affected Feehi/cms Versions

1 component(s)
Fixed Versions:
2.0.8.1
Product / Package Ecosystem Affected Versions Fixed Version
feehi/cms
 Packagist
< 2.0.8.1
2.0.8.1

References

NVD — CVE-2020-21146 NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-21146
Feehi/cms Source Repository REPOSITORY
https://github.com/liufee/cms/issues/43
Security Fix Commit FIX COMMIT
https://github.com/liufee/cms/commit/e92f6877d96e53498101d0664174956e94223d6e
Feehi/cms Source Repository REPOSITORY
https://github.com/liufee/cms

Frequently Asked Questions

What is CVE-2020-21146?
CVE-2020-21146 is a security vulnerability in Feehi/cms involving Feehi CMS vulnerable to Cross-site Scripting in Username Field under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting').
Which Feehi/cms versions are affected?
Affected versions include releases prior to 2.0.8.1 across affected packages: feehi/cms.
What version fixes CVE-2020-21146?
Upgrading to 2.0.8.1 (or the latest patched release for your respective branch) resolves the vulnerability.
Is feehi/cms affected?
Yes, feehi/cms is affected in releases prior to 2.0.8.1. Upgrade your dependency to 2.0.8.1 or later.
What is the CVSS score of CVE-2020-21146?
CVE-2020-21146 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-2020-21146?
CVE-2020-21146 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 Packagist dependencies for CVE-2020-21146?
Run the dependency tree command: 'inspect dependencies for feehi/cms'. 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-v762-47vh-j7q3",
  "modified" : "2023-08-23T18:02:10Z",
  "published" : "2022-05-24T17:40:05Z",
  "aliases" : [ "CVE-2020-21146" ],
  "summary" : "Feehi CMS vulnerable to Cross-site Scripting in Username Field",
  "details" : "Feehi CMS 2.0.8 is affected by a cross-site scripting (XSS) vulnerability. When the user name is inserted as JavaScript code, browsing the post will trigger the XSS.",
  "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" : "Packagist",
      "name" : "feehi/cms"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "2.0.8.1"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 2.0.8"
    }
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2020-21146"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/liufee/cms/issues/43"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/liufee/cms/commit/e92f6877d96e53498101d0664174956e94223d6e"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/liufee/cms"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-79" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2023-07-06T20:56:04Z",
    "nvd_published_at" : "2021-01-26T18:15:00Z"
  }
}