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

> Remote attackers can execute JavaScript in logged-in users' browsers via the processes filter, potentially manipulating proposal endorsements.

- **Severity:** High 8.1 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** Yes
- **Published:** 11 Jul 2023
- **Updated:** 4 Nov 2024
- **Also known as:** GHSA-5652-92r9-3fx9

## What is CVE-2023-34089?

CVE-2023-34089 is a high-severity cross-site scripting vulnerability in decidim, published on 11 Jul 2023. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official 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.

Weakness: CWE-79 (Improper Neutralization of Input During Web Page Generation)

## Which versions are affected by CVE-2023-34089?

8 open source packages ship an affected version, including decidim and decidim-core. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `decidim` | RubyGems | From 0.14.0 | 0.26.7 |
| `decidim` | RubyGems | From 0.14.0 | 0.26.7 |
| `decidim` | RubyGems | From 0.27.0 | 0.27.3 |
| `decidim` | RubyGems | From 0.27.0 | 0.27.3 |
| `decidim-core` | RubyGems | From 0.14.0 | 0.26.7 |
| `decidim-core` | RubyGems | From 0.14.0 | 0.26.7 |
| `decidim-core` | RubyGems | From 0.27.0 | 0.27.3 |
| `decidim-core` | RubyGems | From 0.27.0 | 0.27.3 |

Products: Decidim Decidim.

## How do I fix CVE-2023-34089?

Upgrade decidim to a fixed version for your release line: 0.26.7 or 0.27.3.

## Is CVE-2023-34089 being exploited?

There is no known exploitation of CVE-2023-34089 in the wild and no public exploit code.

## Other vulnerabilities in decidim

- [CVE-2026-23891](https://insights.sbomify.com/CVE-2026-23891/): Decidim has a Cross-site scripting (XSS) vulnerability via user name field (critical 9.3)
- [CVE-2023-36465](https://insights.sbomify.com/CVE-2023-36465/): Decidim has broken access control in templates (critical 9.1)
- [CVE-2025-65017](https://insights.sbomify.com/CVE-2025-65017/): Decidim's private data exports can lead to data leaks (high 8.2)
- [CVE-2023-32693](https://insights.sbomify.com/CVE-2023-32693/): Decidim Cross-site Scripting vulnerability in the external link redirections (high 8.1)
- [CVE-2024-45594](https://insights.sbomify.com/CVE-2024-45594/): Decidim allows cross-site scripting (XSS) in the online or hybrid meeting embeds (high 7.7)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-34089 and fix it if it is affected.

What it is: CVE-2023-34089 is a high-severity cross-site scripting vulnerability in decidim, published on 11 Jul 2023. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2023-34089 in the wild and no public exploit code.

Affected packages and fixed versions:
- decidim (RubyGems): affected from 0.14.0; fixed in 0.26.7
- decidim (RubyGems): affected from 0.14.0; fixed in 0.26.7
- decidim (RubyGems): affected from 0.27.0; fixed in 0.27.3
- decidim (RubyGems): affected from 0.27.0; fixed in 0.27.3
- decidim-core (RubyGems): affected from 0.14.0; fixed in 0.26.7
- decidim-core (RubyGems): affected from 0.14.0; fixed in 0.26.7
- decidim-core (RubyGems): affected from 0.27.0; fixed in 0.27.3
- decidim-core (RubyGems): affected from 0.27.0; fixed in 0.27.3

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2023-34089/ (Markdown: https://insights.sbomify.com/CVE-2023-34089/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-34089
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-34089
- OSV: https://osv.dev/vulnerability/CVE-2023-34089

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-34089/
Summaries are generated and may contain mistakes; the official description above is the record.