CVE-2026-39391 json
CI4MS has Stored XSS via Unescaped Blacklist Note in Admin User List
published 2026-04-08 7 mo ago modified 2026-07-20 3 mo ago also EUVD-2026-20484 , GHSA-7cm9-v848-cfh2
- cvss
- 4.8
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.2%
- EPSS 0.2% chance of exploitation in 30 days, percentile 14%
- public exploits
- 0
- none known
Summary
CI4MS is a CodeIgniter 4-based CMS skeleton that delivers a production-ready, modular architecture with RBAC authorization and theme support. Prior to 0.31.4.0, the blacklist (ban) note parameter in UserController::ajax_blackList_post() is stored in the database without sanitization and rendered into an HTML data-note attribute without escaping. An admin with blacklist privileges can inject arbitrary JavaScript that executes in the browser of any other admin who views the user management page. This vulnerability is fixed in 0.31.4.0.
Patch / fix
- packagist ci4-cms-erp/ci4ms 0.31.4.0
- ci4-cms-erp ci4ms 0.31.4.0
CISA SSVC
- Exploitation
- Proof of concept is public
- Automatable
- no
- Technical impact
- partial
- Assessed
- 7 mo ago
Exploit prediction
0.24% chance of exploitation in the next 30 days, higher than 14% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- github.com https://github.com/ci4-cms-erp/ci4ms/security/advisories/GHSA-7cm9-v848-cfh2 referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 4.8 | CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N |
| GitHub | 3.1 | 4.8 | CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| packagist | ci4-cms-erp/ci4ms | <0.31.4.0 |
0.31.4.0 |
Affected products
- ci4-cms-erp ci4ms
Classification
- Weakness
-
- CWE-79 Improper Neutralization of Input During Web Page Generation
References
-
github.com
/ci4-cms-erp/ci4ms/security/advisories/GHSA-7cm9-v848-cfh2
exploit, web, vendor-advisory
-
nvd.nist.gov
/vuln/detail/CVE-2026-39391
advisory
-
github.com
/ci4-cms-erp/ci4ms
package
-
github.com
/ci4-cms-erp/ci4ms/releases/tag/0.31.4.0
web
Sources
- CVE List CVE-2026-39391
- GitHub Advisory GHSA-7cm9-v848-cfh2
- NVD CVE-2026-39391
Fencer Vulns 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.