CVE-2021-30458: Wikimedia/parsoid Cross-Site Scripting Vulnerability

MODERATE
Advisory Identifier: GHSA-5pqx-77vf-85rw
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CVSS 6.1
CWE-79
Published
Advisory Summary

CVE-2021-30458 is a MODERATE (CVSS 6.1) cross-site scripting vulnerability (CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')) affecting Wikimedia/parsoid libraries in the Packagist ecosystem. The issue involves wikimedia parsoid vulnerable to cross-site scripting (xss). Remediation is available by upgrading affected packages to version 0.12.2, 0.11.1.

CVE-2021-30458 at a Glance

CVE Identifier CVE-2021-30458
GHSA Identifier GHSA-5pqx-77vf-85rw
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 Wikimedia/parsoid
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-2021-30458

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

wikimedia/parsoid fixed: 0.12.2 
Upgrade wikimedia/parsoid to 0.12.2
wikimedia/parsoid fixed: 0.11.1 
Upgrade wikimedia/parsoid to 0.11.1
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 wikimedia/parsoid

How to Check if You Are Affected

To determine whether your application is affected by CVE-2021-30458, inspect your project dependencies for Wikimedia/parsoid:

inspect dependencies for wikimedia/parsoid

Analyze the terminal output to locate any version of Wikimedia/parsoid in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.12.2), 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 Wikimedia/parsoid, 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 Wikimedia Parsoid before 0.11.1 and 0.12.x before 0.12.2. An attacker can send crafted wikitext that Utils/WTUtils.php will transform by using a <meta> tag, bypassing sanitization steps, and potentially allowing for XSS.

CVE-2021-30458 Affected Wikimedia/parsoid Versions

2 component(s)
Fixed Versions:
0.12.20.11.1
Product / Package Ecosystem Affected Versions Fixed Version
wikimedia/parsoid
 Packagist
≥ 0.12
< 0.12.2
0.12.2
wikimedia/parsoid
 Packagist
< 0.11.1
0.11.1

References

NVD — CVE-2021-30458 NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-30458
Wikimedia/parsoid Source Repository REPOSITORY
https://github.com/FriendsOfPHP/security-advisories/blob/master/wikimedia/parsoid/CVE-2021-30458.yaml
Wikimedia/parsoid Source Repository REPOSITORY
https://github.com/wikimedia/mediawiki-services-parsoid
phabricator.wikimedia.org/t279451 WEB
https://phabricator.wikimedia.org/T279451
Wikimedia/parsoid Security Information SECURITY
https://security.gentoo.org/glsa/202107-40
www.mediawiki.org/wiki/parsoid WEB
https://www.mediawiki.org/wiki/Parsoid

Frequently Asked Questions

What is CVE-2021-30458?
CVE-2021-30458 is a security vulnerability in Wikimedia/parsoid involving Wikimedia Parsoid vulnerable to Cross-site Scripting (XSS) under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting').
Which Wikimedia/parsoid versions are affected?
Affected versions include releases prior to 0.12.2, 0.11.1 across affected packages: wikimedia/parsoid.
What version fixes CVE-2021-30458?
Upgrading to 0.12.2, 0.11.1 (or the latest patched release for your respective branch) resolves the vulnerability.
Is wikimedia/parsoid affected?
Yes, wikimedia/parsoid is affected in releases prior to 0.12.2, 0.11.1. Upgrade your dependency to 0.12.2, 0.11.1 or later.
What is the CVSS score of CVE-2021-30458?
CVE-2021-30458 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-2021-30458?
CVE-2021-30458 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-2021-30458?
Run the dependency tree command: 'inspect dependencies for wikimedia/parsoid'. 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-5pqx-77vf-85rw",
  "modified" : "2024-06-07T22:12:19Z",
  "published" : "2022-05-24T17:47:02Z",
  "aliases" : [ "CVE-2021-30458" ],
  "summary" : "Wikimedia Parsoid vulnerable to Cross-site Scripting (XSS)",
  "details" : "An issue was discovered in Wikimedia Parsoid before 0.11.1 and 0.12.x before 0.12.2. An attacker can send crafted wikitext that Utils/WTUtils.php will transform by using a <meta> tag, bypassing sanitization steps, and potentially allowing for XSS.",
  "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" : "wikimedia/parsoid"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0.12"
      }, {
        "fixed" : "0.12.2"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "wikimedia/parsoid"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.11.1"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-30458"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/FriendsOfPHP/security-advisories/blob/master/wikimedia/parsoid/CVE-2021-30458.yaml"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/wikimedia/mediawiki-services-parsoid"
  }, {
    "type" : "WEB",
    "url" : "https://phabricator.wikimedia.org/T279451"
  }, {
    "type" : "WEB",
    "url" : "https://security.gentoo.org/glsa/202107-40"
  }, {
    "type" : "WEB",
    "url" : "https://www.mediawiki.org/wiki/Parsoid"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-79" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2024-06-07T22:12:19Z",
    "nvd_published_at" : "2021-04-09T07:15:00Z"
  }
}