CVE-2020-10960: Mediawiki/core MediaWiki MakeCollapsible Allows Applying Event Vulnerability

MODERATE
Advisory Identifier: GHSA-pfm2-mqwj-ggm5
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CVSS 5.3
CWE-116 CWE-74
Published
Advisory Summary

CVE-2020-10960 is a MODERATE (CVSS 5.3) mediawiki makecollapsible allows applying event vulnerability (CWE-116: Improper Encoding or Escaping of Output) affecting Mediawiki/core libraries in the Packagist ecosystem. The issue involves mediawiki makecollapsible allows applying event handler to any css selector. Remediation is available by upgrading affected packages to version 1.31.7, 1.33.3, 1.34.1.

CVE-2020-10960 at a Glance

CVE Identifier CVE-2020-10960
GHSA Identifier GHSA-pfm2-mqwj-ggm5
Severity MODERATE
CVSS v3.1 Base Score 5.3
CWE Classification CWE-116: Improper Encoding or Escaping of Output
Affected Product Mediawiki/core
Package Ecosystem Packagist
Published Date
Last Updated

Security Impact

CVSS: 5.3

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:N/S:U/C:N/I:L/A:N).

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

How to Fix CVE-2020-10960

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

mediawiki/core fixed: 1.31.7 
Upgrade mediawiki/core to 1.31.7
mediawiki/core fixed: 1.33.3 
Upgrade mediawiki/core to 1.33.3
mediawiki/core fixed: 1.34.1 
Upgrade mediawiki/core to 1.34.1
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 mediawiki/core

How to Check if You Are Affected

To determine whether your application is affected by CVE-2020-10960, inspect your project dependencies for Mediawiki/core:

inspect dependencies for mediawiki/core

Analyze the terminal output to locate any version of Mediawiki/core in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 1.31.7), 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-116: Improper Encoding or Escaping of Output, where the product prepares a structured message for communication with another component, but encoding or escaping of the data is either missing or done incorrectly. as a result, the intended structure of the message is not preserved. In Mediawiki/core, 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

In MediaWiki before 1.34.1, users can add various Cascading Style Sheets (CSS) classes (which can affect what content is shown or hidden in the user interface) to arbitrary DOM nodes via HTML content within a MediaWiki page. This occurs because jquery.makeCollapsible allows applying an event handler to any Cascading Style Sheets (CSS) selector. There is no known way to exploit this for cross-site scripting (XSS).

CVE-2020-10960 Affected Mediawiki/core Versions

3 component(s)
Fixed Versions:
1.31.71.33.31.34.1
Product / Package Ecosystem Affected Versions Fixed Version
mediawiki/core
 Packagist
≥ 1.31.0
< 1.31.7
1.31.7
mediawiki/core
 Packagist
≥ 1.33.0
< 1.33.3
1.33.3
mediawiki/core
 Packagist
≥ 1.34.0
< 1.34.1
1.34.1

References

NVD — CVE-2020-10960 NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-10960
Mediawiki/core Source Repository REPOSITORY
https://github.com/FriendsOfPHP/security-advisories/blob/master/mediawiki/core/CVE-2020-10960.yaml
lists.wikimedia.org/pipermail/wikitech-... WEB
https://lists.wikimedia.org/pipermail/wikitech-l/2020-March/093243.html
phabricator.wikimedia.org/t246602 WEB
https://phabricator.wikimedia.org/T246602

Frequently Asked Questions

What is CVE-2020-10960?
CVE-2020-10960 is a security vulnerability in Mediawiki/core involving MediaWiki makeCollapsible allows applying event handler to any CSS selector under CWE-116: Improper Encoding or Escaping of Output.
Which Mediawiki/core versions are affected?
Affected versions include releases prior to 1.31.7, 1.33.3, 1.34.1 across affected packages: mediawiki/core.
What version fixes CVE-2020-10960?
Upgrading to 1.31.7, 1.33.3, 1.34.1 (or the latest patched release for your respective branch) resolves the vulnerability.
Is mediawiki/core affected?
Yes, mediawiki/core is affected in releases prior to 1.31.7, 1.33.3, 1.34.1. Upgrade your dependency to 1.31.7, 1.33.3, 1.34.1 or later.
What is the CVSS score of CVE-2020-10960?
CVE-2020-10960 has a CVSS v3.1 base score of 5.3 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N.
What CWE is associated with CVE-2020-10960?
CVE-2020-10960 is classified under CWE-116: Improper Encoding or Escaping of Output (The product prepares a structured message for communication with another component, but encoding or escaping of the data is either missing or done incorrectly. As a result, the intended structure of the message is not preserved.).
How can I check Packagist dependencies for CVE-2020-10960?
Run the dependency tree command: 'inspect dependencies for mediawiki/core'. 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-pfm2-mqwj-ggm5",
  "modified" : "2024-04-01T19:54:53Z",
  "published" : "2022-05-24T17:13:21Z",
  "aliases" : [ "CVE-2020-10960" ],
  "summary" : "MediaWiki makeCollapsible allows applying event handler to any CSS selector",
  "details" : "In MediaWiki before 1.34.1, users can add various Cascading Style Sheets (CSS) classes (which can affect what content is shown or hidden in the user interface) to arbitrary DOM nodes via HTML content within a MediaWiki page. This occurs because jquery.makeCollapsible allows applying an event handler to any Cascading Style Sheets (CSS) selector. There is no known way to exploit this for cross-site scripting (XSS).",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "mediawiki/core"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "1.31.0"
      }, {
        "fixed" : "1.31.7"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "mediawiki/core"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "1.33.0"
      }, {
        "fixed" : "1.33.3"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "mediawiki/core"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "1.34.0"
      }, {
        "fixed" : "1.34.1"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2020-10960"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/FriendsOfPHP/security-advisories/blob/master/mediawiki/core/CVE-2020-10960.yaml"
  }, {
    "type" : "WEB",
    "url" : "https://lists.wikimedia.org/pipermail/wikitech-l/2020-March/093243.html"
  }, {
    "type" : "WEB",
    "url" : "https://phabricator.wikimedia.org/T246602"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-116", "CWE-74" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2024-04-01T19:54:53Z",
    "nvd_published_at" : "2020-04-03T15:15:00Z"
  }
}