CVE-2024-27095

Decidim cross-site scripting (XSS) in the admin panel

Workarounds

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.

References

OWASP ASVS v4.0.3-5.1.3

The admin panel is subject to potential XSS attach in case the attacker manages to modify some records 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. And then enter the returned blob ID to the form inputs manually by modifying the edit page source.

Untrusted input is rendered as active markup in a victim's browser, which can run script in their session. Typical impact: session or credential theft, and actions taken as the user.

CVE-2024-27095 has a CVSS score of 5.4 (Medium). The vector is network-reachable, high privileges required, and user interaction required. A CVSS score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether this affects your application depends on whether the vulnerable code is present and reachable in your environment. A fixed version is available (0.27.6, 0.28.1); upgrading removes the vulnerable code path.

Kodem intelligence

Already deployed Kodem?

Available in versions 0.27.6 and 0.28.1.

1. What is CVE-2024-27095? CVE-2024-27095 is a medium-severity cross-site scripting (XSS) vulnerability in decidim-admin (rubygems), affecting versions < 0.27.6. It is fixed in 0.27.6, 0.28.1. Untrusted input is rendered as active markup in a victim's browser, which can run script in their session.
2. How severe is CVE-2024-27095? CVE-2024-27095 has a CVSS score of 5.4 (Medium). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.
3. Which versions of decidim-admin are affected by CVE-2024-27095? decidim-admin (rubygems) versions < 0.27.6 is affected.
4. Is there a fix for CVE-2024-27095? Yes. CVE-2024-27095 is fixed in 0.27.6, 0.28.1. Upgrade to this version or later.
5. Is CVE-2024-27095 exploitable, and should I be worried? Whether CVE-2024-27095 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
6. What actually determines whether CVE-2024-27095 is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
7. How do I fix CVE-2024-27095?
   • Upgrade decidim-admin to 0.27.6 or later
   • Upgrade decidim-admin to 0.28.1 or later

Other vulnerabilities in decidim-admin