CVE-2026-23891

Name: CVE-2026-23891
Creator: NVD / NIST
Published: 2026-04-13T17:16:28.063+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.3/10EPSS 0.36%

Last modified Jun 17, 2026

CVE-2026-23891 is a critical-severity vulnerability rated 9.3/10 on the CVSS scale. 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. EPSS estimates a 0.36% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

8.7/10

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N

CVSS 4.0

9.3/10

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:H/VA:L/SC:H/SI:H/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS Probability

0.36%

27.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-79

Affected Software

Vendor	Product	Versions
Decidim	Decidim	< 0.30.5
Decidim	Decidim	>= 0.31.0, < 0.31.1

References

https://github.com/decidim/decidim/releases/tag/v0.30.5Product, Release Notes
https://github.com/decidim/decidim/releases/tag/v0.31.1Product, Release Notes
https://github.com/decidim/decidim/security/advisories/GHSA-fc46-r95f-hq7gVendor Advisory

Timeline

Published: Apr 13, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-23891?

How severe is CVE-2026-23891?

CVE-2026-23891 has a CVSS score of 9.3/10 (CRITICAL severity). The EPSS model estimates a 0.36% probability of exploitation in the next 30 days.

How do I fix CVE-2026-23891?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-23891?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST