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CVE-2026-28783

Craftcms Craft CMS code injection

9.1 CRITICALEPSS 0.57%
  1. Published4 Mar 2026

Description

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 able to successfully execute this attack, you need to either have allowAdminChanges enabled on production, or a compromised admin account, or an account with access to the System Messages utility. Several PHP functions are not included in the blocklist, which could allow malicious actors with the required permissions to execute various types of payloads, including RCEs, arbitrary file reads, SSRFs, and SSTIs. This vulnerability is fixed in 5.9.0-beta.1 and 4.17.0-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-2026-28783 being actively exploited?

CVE-2026-28783 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.57%.

How severe is CVE-2026-28783?

CVE-2026-28783 has a CVSS 3.1 base score of 9.1, rated critical. EPSS estimates a 0.57% probability of exploitation.

Which products are affected by CVE-2026-28783?

Affected products include Craftcms Craft CMS.

How do I fix CVE-2026-28783?

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-2026-28783 against the real software inventory on every managed device, as each hourly inventory arrives. 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.