Vulnerability · Published Apr 1, 2026 · Assigned by GitHub_M
CVE-2026-34559CI4MS: Blogs Tags 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 26% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
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 when creating or editing blog tags. An attacker can inject a malicious JavaScript payload into the tag name field, which is then stored server-side. This stored payload is later rendered unsafely across public tag pages and administrative interfaces without proper output encoding, leading to stored 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-4333-387x-w245 |
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-4333-387x-w245 x_refsource_CONFIRM
- https://github.com/ci4-cms-erp/ci4ms/releases/tag/0.31.0.0 x_refsource_MISC