CVE-2024-39910 Cross-site scripting (XSS) in the decidim admin panel with QuillJS WYSWYG editor
Attackers can inject malicious scripts via the QuillJS editor in the admin panel, potentially leading to code execution or account takeover.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2024-39910?
CVE-2024-39910 is a medium-severity cross-site scripting vulnerability in decidim, published on 16 Sep 2024. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.
Official description
decidim is a Free Open-Source participatory democracy, citizen participation and open government for cities and organizations. The WYSWYG editor QuillJS is subject to potential XSS attach in case the attacker manages to modify the HTML before being uploaded to the server. The attacker is able to change e.g. to <svg onload=alert('XSS')> if they know how to craft these requests themselves. This issue has been addressed in release version 0.27.7. All users are advised to upgrade. Users unable to upgrade should review the user accounts that have access to the admin panel (i.e. general Administrators, and participatory space's Administrators) and remove access to them if they don't need it. Disable the "Enable rich text editor for participants" setting in the admin dashboard
Weakness: CWE-79
Which versions are affected by CVE-2024-39910?
2 open source packages ship an affected version, including decidim. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
decidim RubyGems | All versions | 0.27.7 |
decidim RubyGems | All versions | 0.27.7 |
Products include Decidim Decidim.
How do I fix CVE-2024-39910?
Upgrade decidim to 0.27.7 or later.
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-2024-39910 being exploited?
There is no known exploitation of CVE-2024-39910 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-2023-34089 Decidim Cross-site Scripting vulnerability in the processes filter
Sources
Also known as GHSA-vvqw-fqwx-mqmm.