What’s Vulnerable › Vulnerabilities

CVE-2026-45138: CI4MS: Stored XSS in Blog Content via Broken `html_purify` Validation Rule

• Severity: medium (CVSS 5.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-20 · updated 2026-10-24
• Weakness: CWE-79

Description

CI4MS is a CodeIgniter 4-based content management system skeleton. Prior to version 0.31.9.0, the custom `html_purify` validation rule used to sanitize blog post bodies relies on by-reference mutation (`?string &$str`), but CodeIgniter 4's validator passes a local copy of the value, so the sanitized text is silently discarded. The Blog controller writes `$lanData['content']` directly into `blog_langs.content`, and the public template echoes it without escaping — yielding stored XSS executable in any visitor's browser, including the superadmin when previewing or editing posts. Version 0.31.9.0 patches the issue.

Affected products

• ci4-cms-erp ci4ms: before 0.31.9.0

References

• https://github.com/ci4-cms-erp/ci4ms/releases/tag/0.31.9.0
• https://github.com/ci4-cms-erp/ci4ms/security/advisories/GHSA-2m69-jmvh-6chr
• https://github.com/ci4-cms-erp/ci4ms/security/advisories/GHSA-2m69-jmvh-6chr

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