Vulnerability · Published Aug 6, 2026 · Assigned by GitHub_M

CVE-2026-45572Decidim: HTML content blocks allow stored script execution

Medium 4.8

In plain English

A medium-severity code injection in decidim from decidim. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 17% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)4.8Medium

Exploit odds (30 days)0.3%top 83.3% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
RubyGems	decidim-core	0.30.9	GHSA-533c-2vh9-4r86
RubyGems	decidim-core	0.31.5	GHSA-533c-2vh9-4r86
RubyGems	decidim-core	0.32.0	GHSA-533c-2vh9-4r86

Affected products (as reported)

Vendor	Product	Versions
decidim	decidim	< 0.30.9>= 0.31.0.rc1, < 0.31.5>= 0.32.0.rc1, < 0.32.0

Weakness: CWE-94 · Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N

References

https://github.com/decidim/decidim/security/advisories/GHSA-533c-2vh9-4r86 x_refsource_CONFIRM
https://github.com/decidim/decidim/pull/16451 x_refsource_MISC