CVE-2026-28697

CriticalCVSS 9.1/10Last modified Jun 17, 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.

Metrics

CVSS 3.1 9.1/10CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

Weakness enumeration

CWE-1336

Affected software

Vendor	Product	Versions
craftcms	cms	>= 5.0.0-RC1, < 5.9.0-beta.1; >= 4.0.0-RC1, < 4.17.0-beta.1

References

https://github.com/craftcms/cms/commit/9dc2a4a3ec8e9cd5e8c0d1129f36371437519197Patch
https://github.com/craftcms/cms/pull/18216Issue Tracking, Patch
https://github.com/craftcms/cms/pull/18219Issue Tracking, Patch
https://github.com/craftcms/cms/security/advisories/GHSA-v47q-jxvr-p68xExploit, Mitigation, Patch, Vendor Advisory

Timeline

Published: Mar 4, 2026
Last modified: Jun 17, 2026
NVD status: Analyzed

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