Vulnerability · Published Jul 20, 2026 · Assigned by GitHub_M

CVE-2026-45270CI4MS: Stored XSS in Pages Module Content via Broken html_purify Validation Rule

High 8.7

In plain English

A high-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 18% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)8.7High

Exploit odds (30 days)0.3%top 81.9% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

CI4MS is a CodeIgniter 4-based content management system skeleton. Prior to version 0.31.9.0, the `Pages` backend module registers the `html_purify` validation rule on language-keyed page content but persists the raw, un-purified POST value into the database. The public renderer for pages (`Home::index()` → `app/Views/templates/default/pages.php`) emits `$pageInfo->content` without `esc()`, yielding stored XSS that fires for every public visitor of the affected page — including administrators. Because pages may be promoted to the site home page, the payload can be served at `/` and reach every visitor of the site. Version 0.31.9.0 patches the issue.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Packagist	ci4-cms-erp/ci4ms	0.31.9.0	GHSA-gqr2-7hcg-rchf

Affected products (as reported)

Vendor	Product	Versions
ci4-cms-erp	ci4ms	< 0.31.9.0

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

References

https://github.com/ci4-cms-erp/ci4ms/security/advisories/GHSA-gqr2-7hcg-rchf x_refsource_CONFIRM
https://github.com/ci4-cms-erp/ci4ms/releases/tag/0.31.9.0 x_refsource_MISC