CVE-2026-23891
critical
CVSS v3
—
CVSS v4 NEW
—
VIR risk
9.5
Description
Decidim has a cross-site scripting (XSS) in user name
Predictions
Exploit likelihood
30%
Patch ETA
—
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
Package impact
| Ecosystem | Package | Vulnerable | Fixed |
|---|---|---|---|
| RubyGems | decidim-core | <~> 0.30.5 | ~> 0.30.5 |
| RubyGems | decidim-core | >=0.31.0.rc1,<0.31.1 | 0.31.1 |
| RubyGems | decidim-core | <0.30.5 | 0.30.5 |
| RUBYGEMS | decidim-core | < 0.30.5 | 0.30.5 |
| RUBYGEMS | decidim-core | >= 0.31.0.rc1, < 0.31.0 | 0.31.1 |
References
- https://github.com/decidim/decidim/security/advisories/GHSA-fc46-r95f-hq7g
- https://nvd.nist.gov/vuln/detail/CVE-2026-23891
- https://github.com/decidim/decidim
- https://github.com/decidim/decidim/releases/tag/v0.30.5
- https://github.com/decidim/decidim/releases/tag/v0.31.1
- https://github.com/rubysec/ruby-advisory-db/blob/master/gems/decidim-core/CVE-2026-23891.yml
- https://github.com/advisories/GHSA-fc46-r95f-hq7g
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.