XSS in Ci4-Cms-Erp Ci4ms
CVE-2026-34569
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 categories. An attacker can inject a malicious JavaScript payload into the category title field, which is then stored server-side. This stored payload is later rendered unsafely across public-facing blog category pages, administrative interfaces, and blog post views without proper output encoding, leading to stored cross-site scripting (XSS). This issue has been patched in version 0.31.0.0.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.9 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.005 (39.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 39th percentile — 39.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.005 · change: +0.001
Affected products
- Ci4-Cms-Erp Ci4ms — versions < 0.31.0.0
Weakness classification (CWE)
References
- github.com/ci4-cms-erp/ci4ms/security/advisories/GHSA-fhrf-q333-82fm (Exploit, Vendor Advisory)
- github.com/ci4-cms-erp/ci4ms/releases/tag/0.31.0.0 (Release Notes)
Frequently asked questions
- What is CVE-2026-34569?
- CVE-2026-34569 is a critical-severity vulnerability in Ci4-Cms-Erp Ci4ms, classified under Cross-site Scripting. CVSS score: 9.9/10. Published 2026-04-01.
- How severe is CVE-2026-34569?
- Critical severity. CVSS v3 base score is 9.9 out of 10.