CVE-2026-23891 json
Decidim has a Cross-site scripting (XSS) vulnerability via user name field
published 6mo ago modified 4mo ago also EUVD-2026-22024 , GHSA-fc46-r95f-hq7g
- cvss
- 8.7
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.4%
- EPSS 0.4% chance of exploitation in 30 days, percentile 29%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- rubygems decidim-core 0.30.5, 0.31.1
- decidim decidim 0.30.5, 0.31.1
Is CVE-2026-23891 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.
Check with FencerCISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 6mo ago
Exploit prediction
0.36% chance of exploitation in the next 30 days, higher than 29% of all scored CVEs (FIRST EPSS, 2026-11-09).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 9.3 | 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 |
| GitHub | 3.1 | 8.7 | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N |
| CNA | 4.0 | 9.3 | 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 |
| NVD | 3.1 | 8.7 | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| rubygems | decidim-core | >=0.31.0.rc1, <0.31.1 <0.30.5 |
0.31.1 0.30.5 |
Affected products
- decidim decidim
Classification
- Weakness
-
- CWE-79 Improper Neutralization of Input During Web Page Generation
References
-
github.com
/decidim/decidim/security/advisories/GHSA-fc46-r95f-hq7g
web, vendor-advisory
-
github.com
/decidim/decidim/releases/tag/v0.30.5
web, product, release-notes
-
github.com
/decidim/decidim/releases/tag/v0.31.1
web, product, release-notes
-
nvd.nist.gov
/vuln/detail/CVE-2026-23891
advisory
-
github.com
/decidim/decidim
package
-
github.com
/rubysec/ruby-advisory-db/blob/master/gems/decidim-core/CVE-2026-23891.yml
web
Sources
- CVE List CVE-2026-23891
- GitHub Advisory GHSA-fc46-r95f-hq7g
- NVD CVE-2026-23891
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.