High severity8.7NVD Advisory· Published Apr 13, 2026· Updated Apr 22, 2026
CVE-2026-23891
CVE-2026-23891
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
decidim-coreRubyGems | >= 0.31.0.rc1, < 0.31.1 | 0.31.1 |
decidim-coreRubyGems | < 0.30.5 | 0.30.5 |
Affected products
2Patches
Vulnerability mechanics
References
6- github.com/advisories/GHSA-fc46-r95f-hq7gghsaADVISORY
- github.com/decidim/decidim/security/advisories/GHSA-fc46-r95f-hq7gnvdVendor AdvisoryWEB
- nvd.nist.gov/vuln/detail/CVE-2026-23891ghsaADVISORY
- github.com/decidim/decidim/releases/tag/v0.30.5nvdProductRelease NotesWEB
- github.com/decidim/decidim/releases/tag/v0.31.1nvdProductRelease NotesWEB
- github.com/rubysec/ruby-advisory-db/blob/master/gems/decidim-core/CVE-2026-23891.ymlghsaWEB
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