Kurz gesagt
- CVE-2026-45572 ist eine Schwachstelle (MITTEL (CVSS 4.8)) in decidim-core.
- Wahrscheinlichkeit einer Ausnutzung in den nächsten 30 Tagen (EPSS): 0.25%, höher als bei 16.7% aller Schwachstellen.
- Abhilfe: auf 0.31.5, 0.32.0, 0.30.9 oder neuer aktualisieren.
| Package | Affected versions | Patched versions |
|---|
| decidim-core RubyGems | ≥ 0.31.0.rc1, < 0.31.5≥ 0.32.0.rc1, < 0.32.0< 0.30.9
| 0.31.50.32.00.30.9
|
Description
Description
A privileged admin user who can edit an affected landing page can store arbitrary HTML/JavaScript in an HTML block, and the public page renders it with html_safe and no output escaping.
Technical description
This issue lets any admin who can edit an affected landing page store arbitrary HTML and JavaScript in an HTML block. The block is then rendered back through Decidim::ContentBlocks::HtmlCell#html_content without a sanitization boundary, so the script executes later in visitor's browsers.
<img width="1541" height="439" alt="decidim-html-xss-01" src="https://github.com/user-attachments/assets/acae1c06-8acb-49be-ab12-aabae33190ce" />
<img width="1540" height="752" alt="decidim-html-xss-02" src="https://github.com/user-attachments/assets/a2f1fa7f-03f3-4d17-b58b-f4db865443e9" />
Impact
- A user with landing-page editing rights for an affected scope can persist JavaScript that executes in visitor's browsers on that page.
- Because exploitation already requires privileged administrative access, the practical risk is lower than a participant-controlled or unauthenticated stored XSS. It still creates a browser-execution primitive in a trusted admin-editable surface.
Patches
See https://github.com/decidim/decidim/pull/16451
Workarounds
Do not give admin permissions to non-trustful users.
Reference
Stored XSS
Credits
This issue was discovered in a security audit organized by the Decidim Association and made by Radically Open Security against Decidim financed by NGI.
NVD description
Decidim is a participatory democracy framework. Prior to 0.30.9, from 0.31.0 before 0.31.5, and in 0.32.0.rc1 before 0.32.0.rc2, an administrator with landing-page editing privileges can store arbitrary HTML and JavaScript in an HTML content block, which Decidim::ContentBlocks::HtmlCell#html_content renders without sanitization, causing the script to execute in visitors' browsers. This issue is fixed in versions 0.30.9, 0.31.5, and 0.32.0.rc2.
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