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CVE-2026-28697

Craftcms Craft CMS remote code execution

9.1 CRITICALPublic exploitEPSS 1.14%
  1. Published4 Mar 2026

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 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredHigh
User interactionNone
ScopeChanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

Affected products

Craftcms Craft CMS> 4.0.0 < 4.17.0 · > 5.0.0 < 5.9.0 · 4.0.0 · 5.0.0

Remediation

Fixed in
Craftcms Craft CMS≥ 4.17.0

References

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Frequently asked

Is CVE-2026-28697 being actively exploited?

CVE-2026-28697 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 1.14%.

How severe is CVE-2026-28697?

CVE-2026-28697 has a CVSS 3.1 base score of 9.1, rated critical. EPSS estimates a 1.14% probability of exploitation.

Which products are affected by CVE-2026-28697?

Affected products include Craftcms Craft CMS.

How do I fix CVE-2026-28697?

Upgrade affected software to a fixed version, for example Craftcms Craft CMS 4.17.0 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-28697 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.