Critical severityNVD Advisory· Published Mar 4, 2026· Updated Mar 6, 2026
Craft Affected by Authenticated RCE via "craft.app.fs.write()" in Twig Templates
CVE-2026-28697
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.
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Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
craftcms/cmsPackagist | >= 5.0.0-RC1, < 5.9.0-beta.1 | 5.9.0-beta.1 |
craftcms/cmsPackagist | >= 4.0.0-RC1, < 4.17.0-beta.1 | 4.17.0-beta.1 |
Affected products
2Patches
Vulnerability mechanics
References
6- github.com/advisories/GHSA-v47q-jxvr-p68xghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2026-28697ghsaADVISORY
- github.com/craftcms/cms/commit/9dc2a4a3ec8e9cd5e8c0d1129f36371437519197ghsax_refsource_MISCWEB
- github.com/craftcms/cms/pull/18216ghsax_refsource_MISCWEB
- github.com/craftcms/cms/pull/18219ghsax_refsource_MISCWEB
- github.com/craftcms/cms/security/advisories/GHSA-v47q-jxvr-p68xghsax_refsource_CONFIRMWEB
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