CVE-2023-33194: Craftcms/cms Cross-Site Scripting Vulnerability

LOW
Advisory Identifier: GHSA-3wxg-w96j-8hq9
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CVSS 3.7
CWE-80 CWE-79
Published
Advisory Summary

CVE-2023-33194 is a LOW (CVSS 3.7) cross-site scripting vulnerability (CWE-80: Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)) affecting Craftcms/cms libraries in the Packagist ecosystem. The issue involves craftcms stored xss in quick post widget error message. Remediation is available by upgrading affected packages to version 4.4.6, 3.8.6.

CVE-2023-33194 at a Glance

CVE Identifier CVE-2023-33194
GHSA Identifier GHSA-3wxg-w96j-8hq9
Severity LOW
CVSS v3.1 Base Score 3.7
CWE Classification CWE-80: Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)
Affected Product Craftcms/cms
Package Ecosystem Packagist
Published Date
Last Updated

Security Impact

CVSS: 3.7

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:L/I:N/A:L).

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 Low (C:L)
Integrity None (I:N)
Availability Low (A:L)

How to Fix CVE-2023-33194

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
craftcms/cms fixed: 3.8.6 
Upgrade craftcms/cms to 3.8.6
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-2023-33194, 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-80: Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS), where the product receives input from an upstream component, but it does not neutralize or incorrectly neutralizes special characters such as "<", ">", and "&" that could be interpreted as web-scripting elements when they are sent to a downstream component that processes web pages. 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 The platform does not filter input and encode output in Quick Post validation error message, which can deliver an XSS payload. ### Details Old CVE fixed the XSS in label HTML but didn’t fix it when clicking save. ### PoC 1. Login at admin 2. Go to setting 3. Create a Section 4. On Entry page, click Edit label 5. Inject the XSS payload into the label and save 6. On the admin dashboard choose new widget -> Quick Post 7. In Quick Post, click save with blank slug; The XSS will be executed "errors":{"title":["<script>alert('nono')</script> cannot be blank."],"slug":["Slug cannot be blank."] Fixed in https://github.com/craftcms/cms/commit/9d0cd0bda7c8a830a3373f8c0f06943e519ac888

CVE-2023-33194 Affected Craftcms/cms Versions

2 component(s)
Fixed Versions:
4.4.63.8.6
Product / Package Ecosystem Affected Versions Fixed Version
craftcms/cms
 Packagist
≥ 4.0.0-RC1
< 4.4.6
4.4.6
craftcms/cms
 Packagist
≥ 3.0.0
< 3.8.6
3.8.6

References

GitHub Advisory / Wiki ADVISORY
https://github.com/craftcms/cms/security/advisories/GHSA-3wxg-w96j-8hq9
NVD — CVE-2023-33194 NVD
https://nvd.nist.gov/vuln/detail/CVE-2023-33194
Security Fix Commit FIX COMMIT
https://github.com/craftcms/cms/commit/9d0cd0bda7c8a830a3373f8c0f06943e519ac888
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-2023-33194?
CVE-2023-33194 is a security vulnerability in Craftcms/cms involving CraftCMS stored XSS in Quick Post widget error message under CWE-80: Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS).
Which Craftcms/cms versions are affected?
Affected versions include releases prior to 4.4.6, 3.8.6 across affected packages: craftcms/cms.
What version fixes CVE-2023-33194?
Upgrading to 4.4.6, 3.8.6 (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, 3.8.6. Upgrade your dependency to 4.4.6, 3.8.6 or later.
What is the CVSS score of CVE-2023-33194?
CVE-2023-33194 has a CVSS v3.1 base score of 3.7 (LOW) with vector string CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:N/A:L.
What CWE is associated with CVE-2023-33194?
CVE-2023-33194 is classified under CWE-80: Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS) (The product receives input from an upstream component, but it does not neutralize or incorrectly neutralizes special characters such as "<", ">", and "&" that could be interpreted as web-scripting elements when they are sent to a downstream component that processes web pages.).
How can I check Packagist dependencies for CVE-2023-33194?
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-3wxg-w96j-8hq9",
  "modified" : "2023-05-26T21:50:40Z",
  "published" : "2023-05-26T13:54:11Z",
  "aliases" : [ "CVE-2023-33194" ],
  "summary" : "CraftCMS stored XSS in Quick Post widget error message",
  "details" : "### Summary\nThe platform does not filter input and encode output in Quick Post validation error message, which can deliver an XSS payload.\n\n### Details\nOld CVE fixed the XSS in label HTML but didn’t fix it when clicking save.\n\n### PoC\n1. Login at admin\n2. Go to setting\n3. Create a Section\n4. On Entry page, click Edit label\n5. Inject the XSS payload into the label and save\n6. On the admin dashboard choose new widget -> Quick Post\n7. In Quick Post, click save with blank slug; The XSS will be executed\n\n    \"errors\":{\"title\":[\"<script>alert('nono')</script> cannot be blank.\"],\"slug\":[\"Slug cannot be blank.\"]\n\nFixed in https://github.com/craftcms/cms/commit/9d0cd0bda7c8a830a3373f8c0f06943e519ac888\n",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:N/A:L"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "craftcms/cms"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "4.0.0-RC1"
      }, {
        "fixed" : "4.4.6"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "craftcms/cms"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "3.0.0"
      }, {
        "fixed" : "3.8.6"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 3.8.5"
    }
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/craftcms/cms/security/advisories/GHSA-3wxg-w96j-8hq9"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2023-33194"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/craftcms/cms/commit/9d0cd0bda7c8a830a3373f8c0f06943e519ac888"
  }, {
    "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", "CWE-80" ],
    "severity" : "LOW",
    "github_reviewed" : true,
    "github_reviewed_at" : "2023-05-26T13:54:11Z",
    "nvd_published_at" : "2023-05-26T21:15:20Z"
  }
}