Vulnerability · Published Apr 1, 2026 · Assigned by GitHub_M

CVE-2026-34566CI4MS: Pages Management Full Account Takeover for All-Roles & Privilege-Escalation via Stored DOM XSS

Critical 9.1

In plain English

A critical-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 20% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)9.1Critical

Exploit odds (30 days)0.3%top 80.1% 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 version 0.31.0.0, the application fails to properly sanitize user-controlled input within the Page Management functionality when creating or editing pages. Multiple input fields accept attacker-controlled JavaScript payloads that are stored server-side. These stored values are later rendered without proper output encoding across administrative page lists and public-facing page views, leading to stored DOM-based cross-site scripting (XSS). This issue has been patched in version 0.31.0.0.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Packagist	ci4-cms-erp/ci4ms	0.31.0.0	GHSA-458r-h248-29c5

Affected products (as reported)

Vendor	Product	Versions
ci4-cms-erp	ci4ms	< 0.31.0.0

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

References

https://github.com/ci4-cms-erp/ci4ms/security/advisories/GHSA-458r-h248-29c5 x_refsource_CONFIRM
https://github.com/ci4-cms-erp/ci4ms/releases/tag/0.31.0.0 x_refsource_MISC