# CVE-2026-28697

## Summary

- **CVE ID:** CVE-2026-28697
- **Severity:** CRITICAL
- **CVSS Score:** 9.4 (CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H)
- **CWE:** CWE-1336
- **Published:** Mar 4, 2026
- **Last Modified:** Mar 12, 2026

## Description

Craft is a content management system (CMS). Prior to 4.17.0-beta.1 and 5.9.0-beta.1, an authenticated administrator can achieve Remote Code Execution (RCE) by injecting a Server-Side Template Injection (SSTI) payload into Twig template fields (e.g., Email Templates). By calling the craft.app.fs.write() method, an attacker can write a malicious PHP script to a web-accessible directory and subsequently access it via the browser to execute arbitrary system commands. This vulnerability is fixed in 4.17.0-beta.1 and 5.9.0-beta.1.

## Affected Products

- craftcms — cms (>= 5.0.0-RC1, < 5.9.0-beta.1)
- craftcms — cms (>= 4.0.0-RC1, < 4.17.0-beta.1)

## References

- [CNA](https://github.com/craftcms/cms/security/advisories/GHSA-v47q-jxvr-p68x)
- [CNA](https://github.com/craftcms/cms/pull/18216)
- [CNA](https://github.com/craftcms/cms/pull/18219)
- [CNA](https://github.com/craftcms/cms/commit/9dc2a4a3ec8e9cd5e8c0d1129f36371437519197)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 1.07%
- **EPSS Percentile:** 62.8

---
_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._