CVE-2023-33195: Craftcms/cms Cross-Site Scripting Vulnerability

MODERATE
Advisory Identifier: GHSA-qpgm-gjgf-8c2x
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CVSS 6.1
CWE-79
Published
Advisory Summary

CVE-2023-33195 is a MODERATE (CVSS 6.1) cross-site scripting vulnerability (CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')) affecting Craftcms/cms libraries in the Packagist ecosystem. The issue involves craft cms xss in rss widget feed. Remediation is available by upgrading affected packages to version 4.4.6.

CVE-2023-33195 at a Glance

CVE Identifier CVE-2023-33195
GHSA Identifier GHSA-qpgm-gjgf-8c2x
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 Craftcms/cms
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-2023-33195

To remediate this vulnerability, upgrade all affected Craftcms/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.

craftcms/cms fixed: 4.4.6 
Upgrade craftcms/cms to 4.4.6
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 craftcms/cms

How to Check if You Are Affected

To determine whether your application is affected by CVE-2023-33195, inspect your project dependencies for Craftcms/cms:

inspect dependencies for craftcms/cms

Analyze the terminal output to locate any version of Craftcms/cms in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 4.4.6), 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 Craftcms/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

### Summary A malformed RSS feed can deliver an XSS payload ### PoC Create an RSS widget and add the domain https://blog.whitebear.vn/file/rss-xss2.rss The XSS payload will be triggered by the title in tag `<item>` Resolved in https://github.com/craftcms/cms/commit/b77cb3023bed4f4a37c11294c4d319ff9f598e1f

CVE-2023-33195 Affected Craftcms/cms Versions

1 component(s)
Fixed Versions:
4.4.6
Product / Package Ecosystem Affected Versions Fixed Version
craftcms/cms
 Packagist
≥ 4.3.0
< 4.4.6
4.4.6

References

GitHub Advisory / Wiki ADVISORY
https://github.com/craftcms/cms/security/advisories/GHSA-qpgm-gjgf-8c2x
NVD — CVE-2023-33195 NVD
https://nvd.nist.gov/vuln/detail/CVE-2023-33195
Security Fix Commit FIX COMMIT
https://github.com/craftcms/cms/commit/b77cb3023bed4f4a37c11294c4d319ff9f598e1f
Craftcms/cms Source Repository REPOSITORY
https://github.com/craftcms/cms
Craftcms/cms Release RELEASE
https://github.com/craftcms/cms/releases/tag/4.4.6

Frequently Asked Questions

What is CVE-2023-33195?
CVE-2023-33195 is a security vulnerability in Craftcms/cms involving Craft CMS XSS in RSS widget feed under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting').
Which Craftcms/cms versions are affected?
Affected versions include releases prior to 4.4.6 across affected packages: craftcms/cms.
What version fixes CVE-2023-33195?
Upgrading to 4.4.6 (or the latest patched release for your respective branch) resolves the vulnerability.
Is craftcms/cms affected?
Yes, craftcms/cms is affected in releases prior to 4.4.6. Upgrade your dependency to 4.4.6 or later.
What is the CVSS score of CVE-2023-33195?
CVE-2023-33195 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-2023-33195?
CVE-2023-33195 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-2023-33195?
Run the dependency tree command: 'inspect dependencies for craftcms/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-qpgm-gjgf-8c2x",
  "modified" : "2023-06-02T23:52:23Z",
  "published" : "2023-05-26T13:55:00Z",
  "aliases" : [ "CVE-2023-33195" ],
  "summary" : "Craft CMS XSS in RSS widget feed",
  "details" : "### Summary\nA malformed RSS feed can deliver an XSS payload\n\n### PoC\nCreate an RSS widget and add the domain https://blog.whitebear.vn/file/rss-xss2.rss\nThe XSS payload will be triggered by the title in tag `<item>`\n\nResolved in https://github.com/craftcms/cms/commit/b77cb3023bed4f4a37c11294c4d319ff9f598e1f\n",
  "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" : "craftcms/cms"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "4.3.0"
      }, {
        "fixed" : "4.4.6"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 4.4.5"
    }
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/craftcms/cms/security/advisories/GHSA-qpgm-gjgf-8c2x"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2023-33195"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/craftcms/cms/commit/b77cb3023bed4f4a37c11294c4d319ff9f598e1f"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/craftcms/cms"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/craftcms/cms/releases/tag/4.4.6"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-79" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2023-05-26T13:55:00Z",
    "nvd_published_at" : "2023-05-27T04:15:25Z"
  }
}