CVEvulnerability

CVE-2026-28783

9.4 CRITICAL Published 2026-03-04 Modified 2026-06-17 Official page ↗
Status
Analyzed
Published
2026-03-04
Last modified
2026-06-17
Assigner
[email protected]
CVSS 4.0 ([email protected])
9.4 CRITICAL — CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS 3.1 ([email protected])
9.1 CRITICAL — CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
Weaknesses
CWE-1336, CWE-184, CWE-94

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.

Affected configurations

• craftcms craft cms (> 4.0.0 < 4.17.0) • craftcms craft cms (> 5.0.0 < 5.9.0) • craftcms craft cms 4.0.0 • craftcms craft cms 5.0.0

Related

Weakness · CWE (3)

  • CWE-1336 Improper Neutralization of Special Elements Used in a Template Engine weakness
  • CWE-184 Incomplete List of Disallowed Inputs weakness
  • CWE-94 Improper Control of Generation of Code weakness

References