CVSS 4.0
9.3 criticalCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:H/VA:L/SC:H/SI:H/SA:LCVE-2026-23891
Critical (9.3) in decidim decidim. EPSS 0.4% chance of exploitation in the next 30 days. Fixed in decidim-core 0.30.5, 0.31.1.
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.
Severity
CVSS 3.1
8.7 highCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N- EPSS
- 0.4% chance of exploitation in the next 30 days; higher than 29% of CVEs (scores of 2026-10-31)
- CWE
- CWE-79
- Published
- Modified
- Record from
- the NVD, synced
Affected
- decidim:decidim
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-fc46-r95f-hq7g | RubyGems | decidim-core | >=0.31.0.rc1 <0.31.1 | 0.31.1 |
| GHSA-fc46-r95f-hq7g | RubyGems | decidim-core | <0.30.5 | 0.30.5 |