CVE-2018-18943: Baserproject/basercms Cross-Site Scripting Vulnerability

MODERATE
Advisory Identifier: GHSA-fx2m-5m9v-jhgp
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CVSS 4.8
CWE-79
Published
Advisory Summary

CVE-2018-18943 is a MODERATE (CVSS 4.8) cross-site scripting vulnerability (CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')) affecting Baserproject/basercms libraries in the Packagist ecosystem. The issue involves xss in basercms before 4.1.4. Remediation is available by upgrading affected packages to version 4.1.4.

CVE-2018-18943 at a Glance

CVE Identifier CVE-2018-18943
GHSA Identifier GHSA-fx2m-5m9v-jhgp
Severity MODERATE
CVSS v3.1 Base Score 4.8
CWE Classification CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Affected Product Baserproject/basercms
Package Ecosystem Packagist
Published Date
Last Updated

Security Impact

CVSS: 4.8

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.0/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required High (PR:H)
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-2018-18943

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

baserproject/basercms fixed: 4.1.4 
Upgrade baserproject/basercms to 4.1.4
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 baserproject/basercms

How to Check if You Are Affected

To determine whether your application is affected by CVE-2018-18943, inspect your project dependencies for Baserproject/basercms:

inspect dependencies for baserproject/basercms

Analyze the terminal output to locate any version of Baserproject/basercms in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 4.1.4), 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 Baserproject/basercms, 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

An issue was discovered in baserCMS before 4.1.4. In the Register New Category feature of the Upload menu, the category name can be used for XSS via the `data[UploaderCategory][name]` parameter to an `admin/uploader/uploader_categories/edit` URI.

CVE-2018-18943 Affected Baserproject/basercms Versions

1 component(s)
Fixed Versions:
4.1.4
Product / Package Ecosystem Affected Versions Fixed Version
baserproject/basercms
 Packagist
< 4.1.4
4.1.4

References

web.archive.org/web/20200130073341/... WEB
https://web.archive.org/web/20200130073341/https://basercms.net/release/4_1_4
web.archive.org/web/20211209034642/... WEB
https://web.archive.org/web/20211209034642/http://sunu11.com/2018/10/31/baserCMS
NVD — CVE-2018-18943 NVD
https://nvd.nist.gov/vuln/detail/CVE-2018-18943

Frequently Asked Questions

What is CVE-2018-18943?
CVE-2018-18943 is a security vulnerability in Baserproject/basercms involving XSS in baserCMS before 4.1.4 under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting').
Which Baserproject/basercms versions are affected?
Affected versions include releases prior to 4.1.4 across affected packages: baserproject/basercms.
What version fixes CVE-2018-18943?
Upgrading to 4.1.4 (or the latest patched release for your respective branch) resolves the vulnerability.
Is baserproject/basercms affected?
Yes, baserproject/basercms is affected in releases prior to 4.1.4. Upgrade your dependency to 4.1.4 or later.
What is the CVSS score of CVE-2018-18943?
CVE-2018-18943 has a CVSS v3.1 base score of 4.8 (MODERATE) with vector string CVSS:3.0/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N.
What CWE is associated with CVE-2018-18943?
CVE-2018-18943 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-2018-18943?
Run the dependency tree command: 'inspect dependencies for baserproject/basercms'. 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-fx2m-5m9v-jhgp",
  "modified" : "2023-07-07T00:42:40Z",
  "published" : "2022-05-14T01:50:42Z",
  "aliases" : [ "CVE-2018-18943" ],
  "summary" : "XSS in baserCMS before 4.1.4",
  "details" : "An issue was discovered in baserCMS before 4.1.4. In the Register New Category feature of the Upload menu, the category name can be used for XSS via the `data[UploaderCategory][name]` parameter to an `admin/uploader/uploader_categories/edit` URI.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.0/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "baserproject/basercms"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "4.1.4"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2018-18943"
  }, {
    "type" : "WEB",
    "url" : "https://web.archive.org/web/20200130073341/https://basercms.net/release/4_1_4"
  }, {
    "type" : "WEB",
    "url" : "https://web.archive.org/web/20211209034642/http://sunu11.com/2018/10/31/baserCMS"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-79" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2023-07-07T00:42:40Z",
    "nvd_published_at" : "2018-11-05T09:29:00Z"
  }
}