CVE-2026-28697: craftcms cms

Vulnerability summary

CVE-2026-28697 is a critical (CVSS 9.4) vulnerability in craftcms cms. EPSS estimates a 1.14% chance of exploitation in the next 30 days, higher than 66% of scored vulnerabilities. 1 public exploit is recorded.

Timeline

1. 04-03-2026
   PublishedVulnerability first disclosed.
2. 06-03-2026
   Last modifiedVulnerability information updated.

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.

• CWE-1336Improper Neutralization of Special Elements Used in a Template EngineThe product uses a template engine to insert or process externally-influenced input, but it does not neutralize or incorrectly neutralizes special elements or syntax that can be interpreted as template expressions or other code directives when processed by the engine.