Critical severity · published Mar 4, 2026
CVE-2026-28697
Craft Affected by Authenticated RCE via "craft.app.fs.write()" in Twig Templates
9.1
CVSS
1.1%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
High
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)1.1% · higher than 66% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
CM
cms · craftcms
>= 5.0.0-RC1, < 5.9.0-beta.1; >= 4.0.0-RC1, < 4.17.0-beta.1 · source: vendor
CC
Craft Cms · Craftcms
after 4.0.0 before 4.17.0; after 5.0.0 before 5.9.0; 4.0.0; 4.0.0; 4.0.0; 4.0.0; +2 more · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-28697
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-28697
Patch
https://github.com/craftcms/cms/commit/9dc2a4a3ec8e9cd5e8c0d1129f36371437519197
Issue Tracking
https://github.com/craftcms/cms/pull/18216
Issue Tracking
https://github.com/craftcms/cms/pull/18219
Exploit
https://github.com/craftcms/cms/security/advisories/GHSA-v47q-jxvr-p68x
More from cms
10.0
CVE-2025-32432
Craft CMS Allows Remote Code Execution
9.8
CVE-2024-56145
RCE when PHP `register_argc_argv` config setting is enabled in craftcms/cms
8.1
CVE-2025-23209
Potential RCE with a compromised security key in craft/cms
9.8
CVE-2026-112776
Craft CMS 5.0.0 before 5.11.0 GraphQL Site-Scope Bypass via Mutations
9.8
CVE-2026-84795
Craft CMS before 5.10.11 Authentication Bypass via Admin Flag Inheritance