Stored Code Execution Vulnerability in Decidim Participatory Framework
CVE-2026-23891

9.3CRITICAL

Key Information:

Vendor

Decidim

Status
Decidim
Vendor
CVE Published:
13 April 2026

What is CVE-2026-23891?

The Decidim Participatory Democracy Framework is subject to a vulnerability that allows low-privileged attackers to execute arbitrary code by exploiting the user name field. This occurs when a user visits a comment page, potentially compromising confidentiality and integrity across security boundaries. The vulnerability affects versions prior to 0.30.5 and those from 0.31.0.rc1 to 0.31.0, which have been subsequently patched in version 0.31.1.

Affected Version(s)

decidim >= 0.31.0.rc1, < 0.31.1 < 0.31.0.rc1, 0.31.1

decidim < 0.30.5 < 0.30.5

References

https://github.com/decidim/decidim/security/advisories/GH...
x_refsource_CONFIRM
https://github.com/decidim/decidim/releases/tag/v0.30.5
x_refsource_MISC
https://github.com/decidim/decidim/releases/tag/v0.31.1
x_refsource_MISC

CVSS V4

Score:
9.3
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.