CVE-2024-41673: Decidim Cross-Site Scripting Vulnerability

HIGH
Advisory Identifier: GHSA-cc4g-m3g7-xmw8
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CVSS 7.1
CWE-79
Published
Advisory Summary

CVE-2024-41673 is a HIGH (CVSS 7.1) 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 decidim has a cross-site scripting vulnerability in the version control page. Remediation is available by upgrading affected packages to version 0.27.8.

CVE-2024-41673 at a Glance

CVE Identifier CVE-2024-41673
GHSA Identifier GHSA-cc4g-m3g7-xmw8
Severity HIGH
CVSS v3.1 Base Score 7.1
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: 7.1

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:U/C:H/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 Unchanged (S:U)
Confidentiality High (C:H)
Integrity Low (I:L)
Availability None (A:N)

How to Fix CVE-2024-41673

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: 0.27.8 
Upgrade decidim to 0.27.8
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-2024-41673, 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 0.27.8), 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 version control feature used in resources is subject to potential cross-site scripting (XSS) attack through a malformed URL. ### Workarounds Not available ### References OWASP ASVS v4.0.3-5.1.3 ### Credits This issue was discovered in a security audit organized by [Open Source Politics](https://opensourcepolitics.eu/) against Decidim done during July 2025.

CVE-2024-41673 Affected Decidim Versions

1 component(s)
Fixed Versions:
0.27.8
Product / Package Ecosystem Affected Versions Fixed Version
decidim
gem/decidim
RubyGems
< 0.27.8
0.27.8

References

GitHub Advisory / Wiki ADVISORY
https://github.com/decidim/decidim/security/advisories/GHSA-cc4g-m3g7-xmw8
NVD — CVE-2024-41673 NVD
https://nvd.nist.gov/vuln/detail/CVE-2024-41673
Security Fix Commit FIX COMMIT
https://github.com/decidim/decidim/commit/8a18c8b1ee85a1b35ee0d8d5893f218695d15637
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-2024-41673.yml

Frequently Asked Questions

What is CVE-2024-41673?
CVE-2024-41673 is a security vulnerability in Decidim involving Decidim has a cross-site scripting vulnerability in the version control page 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 0.27.8 across affected packages: decidim.
What version fixes CVE-2024-41673?
Upgrading to 0.27.8 (or the latest patched release for your respective branch) resolves the vulnerability.
Is decidim affected?
Yes, decidim is affected in releases prior to 0.27.8. Upgrade your dependency to 0.27.8 or later.
What is the CVSS score of CVE-2024-41673?
CVE-2024-41673 has a CVSS v3.1 base score of 7.1 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N.
What CWE is associated with CVE-2024-41673?
CVE-2024-41673 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-2024-41673?
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-cc4g-m3g7-xmw8",
  "modified" : "2024-10-03T13:25:40Z",
  "published" : "2024-10-01T18:14:54Z",
  "aliases" : [ "CVE-2024-41673" ],
  "summary" : "Decidim has a cross-site scripting vulnerability in the version control page",
  "details" : "### Impact\n\nThe version control feature used in resources is subject to potential cross-site scripting (XSS) attack through a malformed URL. \n\n### Workarounds\n\nNot available\n\n### References\n\nOWASP ASVS v4.0.3-5.1.3\n\n### Credits\n\nThis issue was discovered in a security audit organized by [Open Source Politics](https://opensourcepolitics.eu/) against Decidim done during July 2025.  ",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N"
  }, {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "RubyGems",
      "name" : "decidim"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.27.8"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 0.27.7"
    }
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/decidim/decidim/security/advisories/GHSA-cc4g-m3g7-xmw8"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2024-41673"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/decidim/decidim/commit/8a18c8b1ee85a1b35ee0d8d5893f218695d15637"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/decidim/decidim"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/rubysec/ruby-advisory-db/blob/master/gems/decidim/CVE-2024-41673.yml"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-79" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2024-10-01T18:14:54Z",
    "nvd_published_at" : "2024-10-01T15:15:07Z"
  }
}