CVE-2026-23891

HIGH

Decidim <0.30.5 and <0.31.1 User Name - Stored Cross-Site Scripting

Title source: manual
STIX 2.1

Description

Decidim is a participatory democracy framework. In versions below 0.30.5 and 0.31.0.rc1 through 0.31.0, a stored code execution vulnerability in the user name field allows a low-privileged attacker to execute arbitrary code in the context of any user who passively visits a comment page, resulting in high confidentiality and integrity impact across security boundaries. This issue has been fixed in versions 0.30.5 and 0.31.1.

References (3)

Core 3
Core References

Scores

CVSS v3 8.7
EPSS 0.0036
EPSS Percentile 27.4%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact partial

Details

CWE
CWE-79
Status published
Products (4)
decidim/decidim < 0.30.5 (2 CPE variants)
decidim/decidim >= 0.31.0.rc1, < 0.31.1
rubygems/decidim-core 0 - 0.30.5RubyGems
rubygems/decidim-core 0.31.0.rc1 - 0.31.1RubyGems
Published Apr 13, 2026
Tracked Since Apr 13, 2026