What is CVE-2026-28783?

CVE-2026-28783 is a critical-severity vulnerability in Craftcms Cms, classified under Code Injection. CVSS score: 9.1/10. Published 2026-03-04.

How severe is CVE-2026-28783?

Critical severity. CVSS v3 base score is 9.1 out of 10.

RCE in Craftcms Cms

CVE-2026-28783

Craft is a content management system (CMS). Prior to 5.9.0-beta.1 and 4.17.0-beta.1, Craft CMS implements a blocklist to prevent potentially dangerous PHP functions from being called via Twig non-Closure arrow functions. In order to be abl…

Vulnerability class: RCE (Remote Code Execution)

EPSS: 0.005 (36.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H.

Affected products

Craftcms Cms — versions >= 5.0.0-RC1, <= 5.9.0-beta.1, >= 4.0.0-RC1, <= 4.17.0-beta.1
Craftcms Craft_cms — versions 4.0.0, 5.0.0

Weakness classification (CWE)

References

security-advisories@github.com (x_refsource_CONFIRM, Patch, Vendor Advisory)
security-advisories@github.com (Patch, x_refsource_MISC, Issue Tracking)

Frequently asked questions

What is CVE-2026-28783?: CVE-2026-28783 is a critical-severity vulnerability in Craftcms Cms, classified under Code Injection. CVSS score: 9.1/10. Published 2026-03-04.
How severe is CVE-2026-28783?: Critical severity. CVSS v3 base score is 9.1 out of 10.