Decidim: HTML content blocks allow stored script execution (CVE-2026-45572) | HOL Guard CVE

Medium · CVSS 4.8CVE-2026-45572GHSA-533C-2VH9-4R86

Decidim: HTML content blocks allow stored script execution

Answer in brief

CVE-2026-45572 records a Medium severity (CVSS 4.8) vulnerability in Decidim: HTML content blocks allow stored script execution. The current sources do not mark it as known exploited. The current feed maps decidim/decidim (generic), decidim-core (rubygems), decidim-core (rubygems), decidim-core (rubygems) and additional mapped packages. Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Aug 6, 2026Updated Sep 8, 2026Source checked Sep 17, 2026First seen by HOL Jul 13, 2026Material review Sep 8, 2026

Upstream Advisory

Key facts

Risk: Medium · CVSS 4.8
Exploitation: Not marked as known exploited
Affected software: 7 mapped packages or products
Fix availability: Available

Why this deserves its current priority

CVSS is 4.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps decidim/decidim (generic), decidim-core (rubygems), decidim-core (rubygems), decidim-core (rubygems) and additional mapped packages. Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
decidim/decidimgeneric	< 0.30.9 \|\| >= 0.31.0.rc1, < 0.31.5 \|\| >= 0.32.0.rc1, < 0.32.0	Not reported
decidim-corerubygems	<0.30.9	0.30.9
decidim-corerubygems	>=0.31.0.rc1,<0.31.5	0.31.5
decidim-corerubygems	>=0.32.0.rc1,<0.32.0	0.32.0
decidim-corerubygems	>=0 <0.30.9	0.30.9
decidim-corerubygems	>=0.31.0.rc1 <0.31.5	0.31.5
decidim-corerubygems	>=0.32.0.rc1 <0.32.0	0.32.0

Recommended response

Check inventory. Check lockfiles and deployed manifests for decidim/decidim, decidim-core, decidim-core.
Review the reported fix. Update decidim-core to 0.30.9; decidim-core to 0.31.5; decidim-core to 0.32.0; decidim-core to 0.30.9; decidim-core to 0.31.5; decidim-core to 0.32.0 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Aug 6, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 8, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Jul 13, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.