CVE-2020-25815: Mediawiki/core Cross-Site Scripting Vulnerability

MODERATE
Advisory Identifier: GHSA-2f58-vf6g-6p8x
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CVSS 6.1
CWE-79
Published
Advisory Summary

CVE-2020-25815 is a MODERATE (CVSS 6.1) cross-site scripting vulnerability (CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')) affecting Mediawiki/core libraries in the Packagist ecosystem. The issue involves mediawiki cross-site scripting (xss) vulnerability. Remediation is available by upgrading affected packages to version 1.34.3, 1.35.0.

CVE-2020-25815 at a Glance

CVE Identifier CVE-2020-25815
GHSA Identifier GHSA-2f58-vf6g-6p8x
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 Mediawiki/core
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-2020-25815

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: 1.34.3 
Upgrade mediawiki/core to 1.34.3
mediawiki/core fixed: 1.35.0 
Upgrade mediawiki/core to 1.35.0
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-2020-25815, 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 1.34.3), 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 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

An issue was discovered in MediaWiki 1.32.x through 1.34.x before 1.34.4. LogEventList::getFiltersDesc is insecurely using message text to build options names for an HTML multi-select field. The relevant code should use escaped() instead of text().

CVE-2020-25815 Affected Mediawiki/core Versions

2 component(s)
Fixed Versions:
1.34.31.35.0
Product / Package Ecosystem Affected Versions Fixed Version
mediawiki/core
 Packagist
≥ 1.32.0
< 1.34.3
1.34.3
mediawiki/core
 Packagist
≥ 1.35.0-rc.0
< 1.35.0
1.35.0

References

NVD — CVE-2020-25815 NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-25815
gerrit.wikimedia.org/g/mediawiki/core/+/... WEB
https://gerrit.wikimedia.org/g/mediawiki/core/+/ec76e14be658187544f07c1a249a047e1a75eaf8/includes/logging/LogEventsList.php#214
Mediawiki/core Source Repository REPOSITORY
https://github.com/FriendsOfPHP/security-advisories/blob/master/mediawiki/core/CVE-2020-25815.yaml
Mediawiki/core Source Repository REPOSITORY
https://github.com/wikimedia/mediawiki
lists.fedoraproject.org/archives/list/packa... WEB
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/RTTPZ7XMDS66I442OLLHXBDNP2LCBJU6
lists.wikimedia.org/pipermail/mediawiki... WEB
https://lists.wikimedia.org/pipermail/mediawiki-l/2020-September/048480.html
lists.wikimedia.org/pipermail/mediawiki... WEB
https://lists.wikimedia.org/pipermail/mediawiki-l/2020-September/048488.html
phabricator.wikimedia.org/t256171 WEB
https://phabricator.wikimedia.org/T256171

Frequently Asked Questions

What is CVE-2020-25815?
CVE-2020-25815 is a security vulnerability in Mediawiki/core involving MediaWiki Cross-site Scripting (XSS) vulnerability under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting').
Which Mediawiki/core versions are affected?
Affected versions include releases prior to 1.34.3, 1.35.0 across affected packages: mediawiki/core.
What version fixes CVE-2020-25815?
Upgrading to 1.34.3, 1.35.0 (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 1.34.3, 1.35.0. Upgrade your dependency to 1.34.3, 1.35.0 or later.
What is the CVSS score of CVE-2020-25815?
CVE-2020-25815 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-2020-25815?
CVE-2020-25815 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-2020-25815?
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-2f58-vf6g-6p8x",
  "modified" : "2024-05-17T21:56:28Z",
  "published" : "2022-05-24T17:29:42Z",
  "aliases" : [ "CVE-2020-25815" ],
  "summary" : "MediaWiki Cross-site Scripting (XSS) vulnerability",
  "details" : "An issue was discovered in MediaWiki 1.32.x through 1.34.x before 1.34.4. LogEventList::getFiltersDesc is insecurely using message text to build options names for an HTML multi-select field. The relevant code should use escaped() instead of text().",
  "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" : "mediawiki/core"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "1.32.0"
      }, {
        "fixed" : "1.34.3"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "mediawiki/core"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "1.35.0-rc.0"
      }, {
        "fixed" : "1.35.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2020-25815"
  }, {
    "type" : "WEB",
    "url" : "https://gerrit.wikimedia.org/g/mediawiki/core/+/ec76e14be658187544f07c1a249a047e1a75eaf8/includes/logging/LogEventsList.php#214"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/FriendsOfPHP/security-advisories/blob/master/mediawiki/core/CVE-2020-25815.yaml"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/wikimedia/mediawiki"
  }, {
    "type" : "WEB",
    "url" : "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/RTTPZ7XMDS66I442OLLHXBDNP2LCBJU6"
  }, {
    "type" : "WEB",
    "url" : "https://lists.wikimedia.org/pipermail/mediawiki-l/2020-September/048480.html"
  }, {
    "type" : "WEB",
    "url" : "https://lists.wikimedia.org/pipermail/mediawiki-l/2020-September/048488.html"
  }, {
    "type" : "WEB",
    "url" : "https://phabricator.wikimedia.org/T256171"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-79" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2024-05-17T21:56:27Z",
    "nvd_published_at" : "2020-09-27T21:15:00Z"
  }
}