CVE-2026-28697 Craftcms — Exploit & Vulnerability Details CRITICAL

Parameter	Value
CVSS	9.4 (CRITICAL)
Affected Versions	before 5.9.0
Fixed In	4.17.0
Type	CWE-1336 (Template Injection)
Vendor	Craftcms
Public PoC	No

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.

Attack Parameters

Attack Vector

Network

Can be exploited remotely

Attack Complexity

Low

Easy to exploit

Attack Requirements

None

No additional conditions

Privileges Required

High

Admin privileges needed

User Interaction

None

No user interaction needed

Impact Assessment

Confidentiality

High

Complete data leak

Integrity

High

Complete data modification

Availability

High

Complete denial of service

CVSS Vector v4.0

Weakness Type (CWE)

CWE-1336 Template Injection

Vulnerable Products 8

Configuration	From (including)	Up to (excluding)
Craftcms Craft_Cms cpe:2.3:a:craftcms:craft_cms::::::::	`> 4.0.0`	`4.17.0`
Craftcms Craft_Cms cpe:2.3:a:craftcms:craft_cms::::::::	`> 5.0.0`	`5.9.0`
Craftcms Craft_Cms cpe:2.3:a:craftcms:craft_cms:4.0.0:-::::::	—	—
Craftcms Craft_Cms cpe:2.3:a:craftcms:craft_cms:4.0.0:rc1::::::	—	—
Craftcms Craft_Cms cpe:2.3:a:craftcms:craft_cms:4.0.0:rc2::::::	—	—
Craftcms Craft_Cms cpe:2.3:a:craftcms:craft_cms:4.0.0:rc3::::::	—	—
Craftcms Craft_Cms cpe:2.3:a:craftcms:craft_cms:5.0.0:-::::::	—	—
Craftcms Craft_Cms cpe:2.3:a:craftcms:craft_cms:5.0.0:rc1::::::	—	—