CVE-2021-32667: Typo3/cms core Cross-Site Scripting Vulnerability

MODERATE
Advisory Identifier: GHSA-8mq9-fqv8-59wf
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CVSS 6.4
CWE-79
Published
Advisory Summary

CVE-2021-32667 is a MODERATE (CVSS 6.4) cross-site scripting vulnerability (CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')) affecting Typo3/cms core libraries in the Packagist ecosystem. The issue involves cross-site scripting in page preview. Remediation is available by upgrading affected packages to version 9.5.28, 10.4.18, 11.3.1.

CVE-2021-32667 at a Glance

CVE Identifier CVE-2021-32667
GHSA Identifier GHSA-8mq9-fqv8-59wf
Severity MODERATE
CVSS v3.1 Base Score 6.4
CWE Classification CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Affected Product Typo3/cms core
Package Ecosystem Packagist
Published Date
Last Updated

Security Impact

CVSS: 6.4

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:N).

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

How to Fix CVE-2021-32667

To remediate this vulnerability, upgrade all affected Typo3/cms 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.

typo3/cms-core fixed: 9.5.28 
Upgrade typo3/cms-core to 9.5.28
typo3/cms-core fixed: 10.4.18 
Upgrade typo3/cms-core to 10.4.18
typo3/cms-core fixed: 11.3.1 
Upgrade typo3/cms-core to 11.3.1
typo3/cms fixed: 10.4.18 
Upgrade typo3/cms to 10.4.18
typo3/cms fixed: 11.3.1 
Upgrade typo3/cms to 11.3.1
typo3/cms fixed: 9.5.28 
Upgrade typo3/cms to 9.5.28
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 typo3/cms-core

How to Check if You Are Affected

To determine whether your application is affected by CVE-2021-32667, inspect your project dependencies for Typo3/cms core:

inspect dependencies for typo3/cms-core

Analyze the terminal output to locate any version of Typo3/cms core in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 9.5.28), 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 Typo3/cms 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

> ### Meta > * CVSS: `CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N/E:F/RL:O/RC` (5.0) ### Problem Failing to properly encode _Page TSconfig_ settings, corresponding page preview module (_Web>View_) is vulnerable to persistent cross-site scripting. A valid backend user account is needed to exploit this vulnerability. ### Solution Update to TYPO3 versions 9.5.28, 10.4.18, 11.3.1 that fix the problem described. ### Credits Thanks to TYPO3 core merger Oliver Bartsch who reported and fixed the issue. ### References * [TYPO3-CORE-SA-2021-009](https://typo3.org/security/advisory/typo3-core-sa-2021-009)

CVE-2021-32667 Affected Typo3/cms core Versions

6 component(s)
Fixed Versions:
9.5.2810.4.1811.3.1
Product / Package Ecosystem Affected Versions Fixed Version
typo3/cms-core
 Packagist
≥ 9.0.0
< 9.5.28
9.5.28
typo3/cms-core
 Packagist
≥ 10.0.0
< 10.4.18
10.4.18
typo3/cms-core
 Packagist
≥ 11.0.0
< 11.3.1
11.3.1
typo3/cms
 Packagist
≥ 10.0.0
< 10.4.18
10.4.18
typo3/cms
 Packagist
≥ 11.0.0
< 11.3.1
11.3.1
typo3/cms
 Packagist
≥ 9.0.0
< 9.5.28
9.5.28

References

GitHub Advisory / Wiki ADVISORY
https://github.com/TYPO3/TYPO3.CMS/security/advisories/GHSA-8mq9-fqv8-59wf
GitHub Advisory / Wiki ADVISORY
https://github.com/TYPO3/typo3/security/advisories/GHSA-8mq9-fqv8-59wf
NVD — CVE-2021-32667 NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-32667
Typo3/cms core Source Repository REPOSITORY
https://github.com/FriendsOfPHP/security-advisories/blob/master/typo3/cms-core/CVE-2021-32667.yaml
Typo3/cms core Source Repository REPOSITORY
https://github.com/FriendsOfPHP/security-advisories/blob/master/typo3/cms/CVE-2021-32667.yaml
Typo3/cms core Source Repository REPOSITORY
https://github.com/TYPO3/typo3
Typo3/cms core Security Information SECURITY
https://typo3.org/security/advisory/typo3-core-sa-2021-009

Frequently Asked Questions

What is CVE-2021-32667?
CVE-2021-32667 is a security vulnerability in Typo3/cms core involving Cross-Site Scripting in Page Preview under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting').
Which Typo3/cms core versions are affected?
Affected versions include releases prior to 9.5.28, 10.4.18, 11.3.1 across affected packages: typo3/cms-core, typo3/cms.
What version fixes CVE-2021-32667?
Upgrading to 9.5.28, 10.4.18, 11.3.1 (or the latest patched release for your respective branch) resolves the vulnerability.
Is typo3/cms-core affected?
Yes, typo3/cms-core is affected in releases prior to 9.5.28, 10.4.18, 11.3.1. Upgrade your dependency to 9.5.28, 10.4.18, 11.3.1 or later.
Is typo3/cms affected?
Yes, typo3/cms is affected in releases prior to 10.4.18, 11.3.1, 9.5.28. Upgrade your dependency to 10.4.18, 11.3.1, 9.5.28 or later.
What is the CVSS score of CVE-2021-32667?
CVE-2021-32667 has a CVSS v3.1 base score of 6.4 (MODERATE) with vector string CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:N.
What CWE is associated with CVE-2021-32667?
CVE-2021-32667 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-2021-32667?
Run the dependency tree command: 'inspect dependencies for typo3/cms-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-8mq9-fqv8-59wf",
  "modified" : "2021-08-31T21:22:31Z",
  "published" : "2021-07-22T19:34:43Z",
  "aliases" : [ "CVE-2021-32667" ],
  "summary" : "Cross-Site Scripting in Page Preview",
  "details" : "> ### Meta\n> * CVSS: `CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N/E:F/RL:O/RC` (5.0)\n\n### Problem\nFailing to properly encode _Page TSconfig_ settings, corresponding page preview module (_Web>View_) is vulnerable to persistent cross-site scripting. A valid backend user account is needed to exploit this vulnerability.\n\n### Solution\nUpdate to TYPO3 versions 9.5.28, 10.4.18, 11.3.1 that fix the problem described.\n\n### Credits\nThanks to TYPO3 core merger Oliver Bartsch who reported and fixed the issue.\n\n### References\n* [TYPO3-CORE-SA-2021-009](https://typo3.org/security/advisory/typo3-core-sa-2021-009)",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "typo3/cms-core"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "9.0.0"
      }, {
        "fixed" : "9.5.28"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "typo3/cms-core"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "10.0.0"
      }, {
        "fixed" : "10.4.18"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "typo3/cms-core"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "11.0.0"
      }, {
        "fixed" : "11.3.1"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "typo3/cms"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "10.0.0"
      }, {
        "fixed" : "10.4.18"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "typo3/cms"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "11.0.0"
      }, {
        "fixed" : "11.3.1"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "typo3/cms"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "9.0.0"
      }, {
        "fixed" : "9.5.28"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/TYPO3/TYPO3.CMS/security/advisories/GHSA-8mq9-fqv8-59wf"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/TYPO3/typo3/security/advisories/GHSA-8mq9-fqv8-59wf"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-32667"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/FriendsOfPHP/security-advisories/blob/master/typo3/cms-core/CVE-2021-32667.yaml"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/FriendsOfPHP/security-advisories/blob/master/typo3/cms/CVE-2021-32667.yaml"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/TYPO3/typo3"
  }, {
    "type" : "WEB",
    "url" : "https://typo3.org/security/advisory/typo3-core-sa-2021-009"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-79" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-07-20T17:02:53Z",
    "nvd_published_at" : "2021-07-20T15:15:00Z"
  }
}