CVE-2020-21246: Sheng/yiicms YiiCMS Cross Site Scripting Vulnerability Vulnerability

MODERATE
Advisory Identifier: GHSA-gqr4-cvf4-3957
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CVSS 5.4
CWE-79
Published
Advisory Summary

CVE-2020-21246 is a MODERATE (CVSS 5.4) yiicms cross site scripting vulnerability vulnerability (CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')) affecting Sheng/yiicms libraries in the Packagist ecosystem. The issue involves yiicms cross site scripting vulnerability. Remediation is available by upgrading affected packages to version 1.2.1.

CVE-2020-21246 at a Glance

CVE Identifier CVE-2020-21246
GHSA Identifier GHSA-gqr4-cvf4-3957
Severity MODERATE
CVSS v3.1 Base Score 5.4
CWE Classification CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Affected Product Sheng/yiicms
Package Ecosystem Packagist
Published Date
Last Updated

Security Impact

CVSS: 5.4

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

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required Low (PR:L)
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-2020-21246

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

sheng/yiicms fixed: 1.2.1 
Upgrade sheng/yiicms to 1.2.1
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 sheng/yiicms

How to Check if You Are Affected

To determine whether your application is affected by CVE-2020-21246, inspect your project dependencies for Sheng/yiicms:

inspect dependencies for sheng/yiicms

Analyze the terminal output to locate any version of Sheng/yiicms in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 1.2.1), 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 Sheng/yiicms, 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 vulnerability in YiiCMS v.1.2.0 and prior allows a remote attacker to execute arbitrary code via the news function.

CVE-2020-21246 Affected Sheng/yiicms Versions

1 component(s)
Fixed Versions:
1.2.1
Product / Package Ecosystem Affected Versions Fixed Version
sheng/yiicms
 Packagist
< 1.2.1
1.2.1

References

NVD — CVE-2020-21246 NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-21246
Sheng/yiicms Source Repository REPOSITORY
https://github.com/yongshengli/yiicms/issues/6
Security Fix Commit FIX COMMIT
https://github.com/yongshengli/yiicms/commit/4a9d68564eb78d9f64e3f5dd77186a154093615b
Sheng/yiicms Source Repository REPOSITORY
https://github.com/yongshengli/yiicms

Frequently Asked Questions

What is CVE-2020-21246?
CVE-2020-21246 is a security vulnerability in Sheng/yiicms involving YiiCMS Cross Site Scripting vulnerability under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting').
Which Sheng/yiicms versions are affected?
Affected versions include releases prior to 1.2.1 across affected packages: sheng/yiicms.
What version fixes CVE-2020-21246?
Upgrading to 1.2.1 (or the latest patched release for your respective branch) resolves the vulnerability.
Is sheng/yiicms affected?
Yes, sheng/yiicms is affected in releases prior to 1.2.1. Upgrade your dependency to 1.2.1 or later.
What is the CVSS score of CVE-2020-21246?
CVE-2020-21246 has a CVSS v3.1 base score of 5.4 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N.
What CWE is associated with CVE-2020-21246?
CVE-2020-21246 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-2020-21246?
Run the dependency tree command: 'inspect dependencies for sheng/yiicms'. 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-gqr4-cvf4-3957",
  "modified" : "2024-12-10T20:55:53Z",
  "published" : "2023-06-20T15:31:08Z",
  "aliases" : [ "CVE-2020-21246" ],
  "summary" : "YiiCMS Cross Site Scripting vulnerability",
  "details" : "Cross Site Scripting vulnerability in YiiCMS v.1.2.0 and prior allows a remote attacker to execute arbitrary code via the news function.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "sheng/yiicms"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "1.2.1"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2020-21246"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/yongshengli/yiicms/issues/6"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/yongshengli/yiicms/commit/4a9d68564eb78d9f64e3f5dd77186a154093615b"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/yongshengli/yiicms"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-79" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2023-06-21T22:09:54Z",
    "nvd_published_at" : "2023-06-20T15:15:11Z"
  }
}