CVE-2023-32693: Decidim Cross-Site Scripting Vulnerability

MODERATE
Advisory Identifier: GHSA-469h-mqg8-535r
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CVSS 6.1
CWE-79
Published
Advisory Summary

CVE-2023-32693 is a MODERATE (CVSS 6.1) 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 cross-site scripting vulnerability in the external link redirections. Remediation is available by upgrading affected packages to version 0.27.3, 0.26.7.

CVE-2023-32693 at a Glance

CVE Identifier CVE-2023-32693
GHSA Identifier GHSA-469h-mqg8-535r
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 Decidim
Package Ecosystem RubyGems
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-2023-32693

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: 0.27.3 
Upgrade decidim to 0.27.3
decidim fixed: 0.26.7 
Upgrade decidim to 0.26.7
decidim-core fixed: 0.26.7 
Upgrade decidim-core to 0.26.7
decidim-core fixed: 0.27.3 
Upgrade decidim-core to 0.27.3
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-2023-32693, 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 0.27.3), 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 external link feature is susceptible to Cross-site scripting. This allows a remote attacker to execute JavaScript code in the context of a currently logged-in user. An attacker could use this vulnerability to make other users endorse or support proposals they have no intention of supporting or endorsing. ### Patches The problem was patched in [v0.27.3](https://github.com/decidim/decidim/releases/tag/v0.27.3) and [v0.26.7](https://github.com/decidim/decidim/releases/tag/v0.26.7)

CVE-2023-32693 Affected Decidim Versions

4 component(s)
Fixed Versions:
0.27.30.26.7
Product / Package Ecosystem Affected Versions Fixed Version
decidim
gem/decidim
RubyGems
≥ 0.27.0
< 0.27.3
0.27.3
decidim
gem/decidim
RubyGems
≥ 0.25.0
< 0.26.7
0.26.7
decidim-core
gem/decidim-core
RubyGems
≥ 0.25.0
< 0.26.7
0.26.7
decidim-core
gem/decidim-core
RubyGems
≥ 0.27.0
< 0.27.3
0.27.3

References

GitHub Advisory / Wiki ADVISORY
https://github.com/decidim/decidim/security/advisories/GHSA-469h-mqg8-535r
NVD — CVE-2023-32693 NVD
https://nvd.nist.gov/vuln/detail/CVE-2023-32693
Decidim Source Repository REPOSITORY
https://github.com/decidim/decidim
Decidim Release RELEASE
https://github.com/decidim/decidim/releases/tag/v0.26.7
Decidim Release RELEASE
https://github.com/decidim/decidim/releases/tag/v0.27.3
Decidim Source Repository REPOSITORY
https://github.com/rubysec/ruby-advisory-db/blob/master/gems/decidim-core/CVE-2023-32693.yml
Decidim Source Repository REPOSITORY
https://github.com/rubysec/ruby-advisory-db/blob/master/gems/decidim/CVE-2023-32693.yml

Frequently Asked Questions

What is CVE-2023-32693?
CVE-2023-32693 is a security vulnerability in Decidim involving Decidim Cross-site Scripting vulnerability in the external link redirections 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 0.27.3, 0.26.7 across affected packages: decidim, decidim-core.
What version fixes CVE-2023-32693?
Upgrading to 0.27.3, 0.26.7 (or the latest patched release for your respective branch) resolves the vulnerability.
Is decidim affected?
Yes, decidim is affected in releases prior to 0.27.3, 0.26.7. Upgrade your dependency to 0.27.3, 0.26.7 or later.
Is decidim-core affected?
Yes, decidim-core is affected in releases prior to 0.26.7, 0.27.3. Upgrade your dependency to 0.26.7, 0.27.3 or later.
What is the CVSS score of CVE-2023-32693?
CVE-2023-32693 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-2023-32693?
CVE-2023-32693 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-2023-32693?
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-469h-mqg8-535r",
  "modified" : "2023-07-20T15:02:01Z",
  "published" : "2023-07-11T22:47:01Z",
  "aliases" : [ "CVE-2023-32693" ],
  "summary" : "Decidim Cross-site Scripting vulnerability in the external link redirections",
  "details" : "### Impact\n\nThe external link feature is susceptible to Cross-site scripting. This allows a remote attacker to execute JavaScript code in the context of a currently logged-in user. An attacker could use this vulnerability to make other users endorse or support proposals they have no intention of supporting or endorsing.\n\n### Patches\n\nThe problem was patched in [v0.27.3](https://github.com/decidim/decidim/releases/tag/v0.27.3) and [v0.26.7](https://github.com/decidim/decidim/releases/tag/v0.26.7)\n",
  "severity" : [ {
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  } ],
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      }, {
        "fixed" : "0.27.3"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/decidim/decidim/security/advisories/GHSA-469h-mqg8-535r"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2023-32693"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/decidim/decidim"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/decidim/decidim/releases/tag/v0.26.7"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/decidim/decidim/releases/tag/v0.27.3"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/rubysec/ruby-advisory-db/blob/master/gems/decidim-core/CVE-2023-32693.yml"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/rubysec/ruby-advisory-db/blob/master/gems/decidim/CVE-2023-32693.yml"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-79" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2023-07-11T22:47:01Z",
    "nvd_published_at" : "2023-07-11T18:15:14Z"
  }
}