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CVE-2026-28697

Craft Affected by Authenticated RCE via "craft.app.fs.write()" in Twig Templates PUBLISHED

Description (CNA)

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.

Affected (CNA)

Vendor / productVersions
craftcms / cmsaffected >= 5.0.0-RC1, < 5.9.0-beta.1; affected >= 4.0.0-RC1, < 4.17.0-beta.1

CWE

CWE-1336

References

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.