CVE-2026-286979.4CriticalCWE-1336

CVE-2026-28697: Craft Affected by Authenticated RCE via "craft.app.fs.write()" in Twig Templates

craftcms · cms

Affected: craftcms cms · Exploitation: possible (1 to 10%)

Not in CyberSIXT coverage yet: no article names this CVE. This page shows the public record.

1.2%probability of exploitation in the next 30 days

68th percentile

050100

Higher than 68% of scored CVEs

9.4CriticalCVSS 4.0

LowMediumHighCrit.

DescriptionCVE.org

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 products1

From the CVE record. A product or version that is not listed is unknown, not unaffected.

craftcms · cms>= 5.0.0-RC1, < 5.9.0-beta.1; >= 4.0.0-RC1, < 4.17.0-beta.1

On the Atlas

Every published CVE is on the CyberSIXT Atlas, grouped by weakness, vendor and month.

Open the Atlas

Exploitation: Possible (1 to 10%). EPSS between 1% and 10%.
CISA KEV: Not listed
Public check: No public nuclei template
Weakness: Improper Neutralization of Special Elements Used in a Template Engine · Command and Code Injection
Vendor: craftcms
Published: March 2026
Band: Possible (1 to 10%), March 2026

CoverageNo articles yet

No CyberSIXT article names CVE-2026-28697 yet, so there is no coverage timeline, action brief or change log for it. Everything on this page comes from the public CVE record, CISA KEV, EPSS and the nuclei template index. Search the archive or see the CVEs in the news.