CVE-2018-11326: Joomla/joomla cms Cross-Site Scripting Vulnerability

MODERATE
Advisory Identifier: GHSA-g3m5-vvj7-xrwv
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CVSS 4.8
CWE-79
Published
Advisory Summary

CVE-2018-11326 is a MODERATE (CVSS 4.8) cross-site scripting vulnerability (CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')) affecting Joomla/joomla cms libraries in the Packagist ecosystem. The issue involves joomla! xss vulnerability. Remediation is available by upgrading affected packages to version 3.8.8.

CVE-2018-11326 at a Glance

CVE Identifier CVE-2018-11326
GHSA Identifier GHSA-g3m5-vvj7-xrwv
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 Joomla/joomla cms
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-2018-11326

To remediate this vulnerability, upgrade all affected Joomla/joomla 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.

joomla/joomla-cms fixed: 3.8.8 
Upgrade joomla/joomla-cms to 3.8.8
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 joomla/joomla-cms

How to Check if You Are Affected

To determine whether your application is affected by CVE-2018-11326, inspect your project dependencies for Joomla/joomla cms:

inspect dependencies for joomla/joomla-cms

Analyze the terminal output to locate any version of Joomla/joomla cms in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 3.8.8), 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 Joomla/joomla 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

An issue was discovered in Joomla! Core starting in 3.0.0 and prior to 3.8.8. Inadequate input filtering leads to a multiple XSS vulnerabilities. Additionally, the default filtering settings could potentially allow users of the default Administrator user group to perform a XSS attack.

CVE-2018-11326 Affected Joomla/joomla cms Versions

1 component(s)
Fixed Versions:
3.8.8
Product / Package Ecosystem Affected Versions Fixed Version
joomla/joomla-cms
 Packagist
≥ 3.0.0
< 3.8.8
3.8.8

References

NVD — CVE-2018-11326 NVD
https://nvd.nist.gov/vuln/detail/CVE-2018-11326
Joomla/joomla cms Security Information SECURITY
https://developer.joomla.org/security-centre/733-20180505-core-xss-vulnerabilities-additional-hadering.html
Joomla/joomla cms Source Repository REPOSITORY
https://github.com/joomla/joomla-cms
Joomla/joomla cms Security Information SECURITY
https://web.archive.org/web/20210124173032/http://www.securityfocus.com/bid/104270
Joomla/joomla cms Security Information SECURITY
https://web.archive.org/web/20211129145422/http://www.securitytracker.com/id/1040966

Frequently Asked Questions

What is CVE-2018-11326?
CVE-2018-11326 is a security vulnerability in Joomla/joomla cms involving Joomla! XSS Vulnerability under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting').
Which Joomla/joomla cms versions are affected?
Affected versions include releases prior to 3.8.8 across affected packages: joomla/joomla-cms.
What version fixes CVE-2018-11326?
Upgrading to 3.8.8 (or the latest patched release for your respective branch) resolves the vulnerability.
Is joomla/joomla-cms affected?
Yes, joomla/joomla-cms is affected in releases prior to 3.8.8. Upgrade your dependency to 3.8.8 or later.
What is the CVSS score of CVE-2018-11326?
CVE-2018-11326 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-2018-11326?
CVE-2018-11326 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-2018-11326?
Run the dependency tree command: 'inspect dependencies for joomla/joomla-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-g3m5-vvj7-xrwv",
  "modified" : "2023-10-06T16:56:17Z",
  "published" : "2022-05-14T03:16:51Z",
  "aliases" : [ "CVE-2018-11326" ],
  "summary" : "Joomla! XSS Vulnerability",
  "details" : "An issue was discovered in Joomla! Core starting in 3.0.0 and prior to 3.8.8. Inadequate input filtering leads to a multiple XSS vulnerabilities. Additionally, the default filtering settings could potentially allow users of the default Administrator user group to perform a XSS attack.",
  "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" : "joomla/joomla-cms"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "3.0.0"
      }, {
        "fixed" : "3.8.8"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2018-11326"
  }, {
    "type" : "WEB",
    "url" : "https://developer.joomla.org/security-centre/733-20180505-core-xss-vulnerabilities-additional-hadering.html"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/joomla/joomla-cms"
  }, {
    "type" : "WEB",
    "url" : "https://web.archive.org/web/20210124173032/http://www.securityfocus.com/bid/104270"
  }, {
    "type" : "WEB",
    "url" : "https://web.archive.org/web/20211129145422/http://www.securitytracker.com/id/1040966"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-79" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2023-07-25T19:58:05Z",
    "nvd_published_at" : "2018-05-22T15:29:00Z"
  }
}