CVE-2024-39910: Decidim Cross-Site Scripting Vulnerability

MODERATE
Advisory Identifier: GHSA-vvqw-fqwx-mqmm
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CVSS 5.4
CWE-79
Published
Advisory Summary

CVE-2024-39910 is a MODERATE (CVSS 5.4) cross-site scripting vulnerability (CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')) affecting Decidim libraries in the RubyGems ecosystem. The issue involves :admin vulnerable to cross-site scripting (xss) in the admin panel with quilljs wyswyg editor. Remediation is available by upgrading affected packages to version 0.27.7.

CVE-2024-39910 at a Glance

CVE Identifier CVE-2024-39910
GHSA Identifier GHSA-vvqw-fqwx-mqmm
Severity MODERATE
CVSS v3.1 Base Score 5.4
CWE Classification CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Affected Product Decidim
Package Ecosystem RubyGems
Published Date
Last Updated

Security Impact

CVSS: 5.4

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

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

How to Fix CVE-2024-39910

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

decidim fixed: 0.27.7 
Upgrade decidim to 0.27.7
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 decidim

How to Check if You Are Affected

To determine whether your application is affected by CVE-2024-39910, inspect your project dependencies for Decidim:

inspect dependencies for decidim

Analyze the terminal output to locate any version of Decidim in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.27.7), 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 Decidim, 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

### Impact The WYSWYG editor QuillJS is subject to potential XSS attach in case the attacker manages to modify the HTML before being uploaded to the server. The attacker is able to change e.g. to <svg onload=alert('XSS')> if they know how to craft these requests themselves. ### Patches N/A ### Workarounds Review the user accounts that have access to the admin panel (i.e. general Administrators, and participatory space's Administrators) and remove access to them if they don't need it. Disable the "Enable rich text editor for participants" setting in the admin dashboard ### References OWASP ASVS v4.0.3-5.1.3

CVE-2024-39910 Affected Decidim Versions

1 component(s)
Fixed Versions:
0.27.7
Product / Package Ecosystem Affected Versions Fixed Version
decidim
gem/decidim
RubyGems
< 0.27.7
0.27.7

References

GitHub Advisory / Wiki ADVISORY
https://github.com/decidim/decidim/security/advisories/GHSA-vvqw-fqwx-mqmm
NVD — CVE-2024-39910 NVD
https://nvd.nist.gov/vuln/detail/CVE-2024-39910
Security Fix Commit FIX COMMIT
https://github.com/decidim/decidim/commit/47adca81cabea898005ec07b130b008f2a2be99f
Decidim Source Repository REPOSITORY
https://github.com/decidim/decidim
Decidim Source Repository REPOSITORY
https://github.com/rubysec/ruby-advisory-db/blob/master/gems/decidim/CVE-2024-39910.yml

Frequently Asked Questions

What is CVE-2024-39910?
CVE-2024-39910 is a security vulnerability in Decidim involving :Admin vulnerable to cross-site scripting (XSS) in the admin panel with QuillJS WYSWYG editor under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting').
Which Decidim versions are affected?
Affected versions include releases prior to 0.27.7 across affected packages: decidim.
What version fixes CVE-2024-39910?
Upgrading to 0.27.7 (or the latest patched release for your respective branch) resolves the vulnerability.
Is decidim affected?
Yes, decidim is affected in releases prior to 0.27.7. Upgrade your dependency to 0.27.7 or later.
What is the CVSS score of CVE-2024-39910?
CVE-2024-39910 has a CVSS v3.1 base score of 5.4 (MODERATE) with vector string CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:C/C:H/I:N/A:N.
What CWE is associated with CVE-2024-39910?
CVE-2024-39910 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 RubyGems dependencies for CVE-2024-39910?
Run the dependency tree command: 'inspect dependencies for decidim'. 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-vvqw-fqwx-mqmm",
  "modified" : "2024-09-17T22:27:43Z",
  "published" : "2024-09-16T17:17:54Z",
  "aliases" : [ "CVE-2024-39910" ],
  "summary" : " Decidim::Admin vulnerable to cross-site scripting (XSS) in the admin panel with QuillJS WYSWYG editor",
  "details" : "### Impact\n\nThe WYSWYG editor QuillJS is subject to potential XSS attach in case the attacker manages to modify the HTML before being uploaded to the server.\n\nThe attacker is able to change e.g. to <svg onload=alert('XSS')> if they know how to craft these requests themselves. \n\n### Patches\n\nN/A\n\n### Workarounds\n\nReview the user accounts that have access to the admin panel (i.e. general Administrators, and participatory space's Administrators) and remove access to them if they don't need it. \n\nDisable the \"Enable rich text editor for participants\" setting in the admin dashboard\n\n### References\n\nOWASP ASVS v4.0.3-5.1.3\n",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:C/C:H/I:N/A:N"
  }, {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:A/VC:N/VI:N/VA:N/SC:H/SI:N/SA:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "RubyGems",
      "name" : "decidim"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.27.7"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 0.27.6"
    }
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/decidim/decidim/security/advisories/GHSA-vvqw-fqwx-mqmm"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2024-39910"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/decidim/decidim/commit/47adca81cabea898005ec07b130b008f2a2be99f"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/decidim/decidim"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/rubysec/ruby-advisory-db/blob/master/gems/decidim/CVE-2024-39910.yml"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-79" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2024-09-16T17:17:54Z",
    "nvd_published_at" : "2024-09-16T19:16:10Z"
  }
}