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.
- 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
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
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 | 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 |
2 more packages
decidim-core RubyGems | From 0.27.0 | 0.27.3 |
decidim-core RubyGems | From 0.27.0 | 0.27.3 |
Products include 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.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
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 Decidim has a Cross-site scripting (XSS) vulnerability via user name field
- CVE-2023-36465 Decidim has broken access control in templates
- CVE-2025-65017 Decidim's private data exports can lead to data leaks
- CVE-2023-32693 Decidim Cross-site Scripting vulnerability in the external link redirections
- CVE-2024-45594 Decidim allows cross-site scripting (XSS) in the online or hybrid meeting embeds
Sources
Also known as GHSA-5652-92r9-3fx9.