CVE-2026-23891
Published:April 13, 2026
Updated:April 23, 2026
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.
Affected Packages
https://github.com/decidim/decidim.git (GITHUB):
Affected version(s) >=v0.0.1.alpha <v0.30.5Fix Suggestion:
Update to version v0.30.5https://github.com/decidim/decidim.git (GITHUB):
Affected version(s) =v0.31.0 <v0.31.1Fix Suggestion:
Update to version v0.31.1decidim-core (RUBY):
Affected version(s) >=0.0.1.alpha1 <0.30.5Fix Suggestion:
Update to version 0.30.5decidim-core (RUBY):
Affected version(s) >=0.31.0.rc1 <0.31.1Fix Suggestion:
Update to version 0.31.1Related Resources (5)
Do you need more information?
Contact UsCVSS v4
Base Score:
9.3
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
LOW
User Interaction
PASSIVE
Vulnerable System Confidentiality
HIGH
Vulnerable System Integrity
HIGH
Vulnerable System Availability
LOW
Subsequent System Confidentiality
HIGH
Subsequent System Integrity
HIGH
Subsequent System Availability
LOW
CVSS v3
Base Score:
8.9
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
LOW
Weakness Type (CWE)
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
EPSS
Base Score:
0.06
