Vulnerability · Published Apr 8, 2026 · Assigned by GitHub_M

CVE-2026-39392CI4MS has Stored XSS in Pages Content Due to Missing html_purify Sanitization

Medium 5.5

In plain English

A medium-severity cross-site scripting in ci4ms from ci4-cms-erp. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 17% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)5.5Medium

Exploit odds (30 days)0.3%top 83.4% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

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 Pages module does not apply the html_purify validation rule to content fields during create and update operations, while the Blog module does. Page content is stored unsanitized in the database and rendered as raw HTML on the public frontend via echo $pageInfo->content. An authenticated admin with page-editing privileges can inject arbitrary JavaScript that executes in the browser of every public visitor viewing the page. This vulnerability is fixed in 0.31.4.0.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Packagist	ci4-cms-erp/ci4ms	0.31.4.0	GHSA-fjpj-6qcq-6pw2

Affected products (as reported)

Vendor	Product	Versions
ci4-cms-erp	ci4ms	< 0.31.4.0

Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:L/A:N

References

https://github.com/ci4-cms-erp/ci4ms/security/advisories/GHSA-fjpj-6qcq-6pw2 x_refsource_CONFIRM