Decidim up to 0.30.8/0.31.4/0.32.0.rc1 HtmlCell HtmlCell#html_content HTML injection

Summaryinfo

A vulnerability categorized as problematic has been discovered in Decidim up to 0.30.8/0.31.4/0.32.0.rc1. Affected is the function Decidim::ContentBlocks::HtmlCell#html_content of the component HtmlCell. The manipulation results in HTML injection. This vulnerability is cataloged as CVE-2026-45572. The attack may be launched remotely. There is no exploit available.

Detailsinfo

A vulnerability, which was classified as problematic, was found in Decidim up to 0.30.8/0.31.4/0.32.0.rc1. Affected is the function Decidim::ContentBlocks::HtmlCell#html_content of the component HtmlCell. The manipulation with an unknown input leads to a html injection vulnerability. CWE is classifying the issue as CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. This is going to have an impact on integrity. CVE summarizes:

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.

The advisory is available at github.com. This vulnerability is traded as CVE-2026-45572 since 05/12/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. Additional levels of successful authentication are needed for exploitation. Successful exploitation requires user interaction by the victim. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1059.007 by the MITRE ATT&CK project.

Upgrading to version 0.30.9, 0.31.5 or 0.32.0.rc2 eliminates this vulnerability.

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Productinfo

Name

• Decidim

Version

• 0.30.0
• 0.30.1
• 0.30.2
• 0.30.3
• 0.30.4
• 0.30.5
• 0.30.6
• 0.30.7
• 0.30.8
• 0.31.0
• 0.31.1
• 0.31.2
• 0.31.3
• 0.31.4
• 0.32.0.rc1

Website

• Product: https://github.com/decidim/decidim/

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