Is this vulnerability remotely exploitable over the internet?

Yes, but only if an attacker can reach interfaces where Twig templates are processed with sufficient privilege and can control the template content or parameters. In practice, this typically requires access to administrative or semi-administrative features such as System Messages or other high-privilege template-editing capabilities.

What level of access does an attacker need to exploit this issue?

The attacker generally needs one of the following: a compromised admin account, an account with access to the System Messages utility, or a production instance where `allowAdminChanges` is enabled and reachable. Anonymous users without such access cannot typically exploit this vulnerability directly.

What is the safest general fix pattern for developers and administrators?

Move away from blocklist-based function restrictions toward a strict allowlist of safe functions that templates are allowed to call, and ensure that templates executing with high privilege do not expose powerful primitives such as file I/O, network requests, or dynamic code execution.

Severity:

CRITICAL RISK

(9.1)

Improper PHP Function Blocking Leading to Code Injection (CWE-94) in Craft CMS Twig Arrow Functions

CVE-2026-28783

Published:

Mar 4, 2026

Status:

Analyzed

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

NDV

Recent Vulnerabilities

CWE-78

CRITICAL RISK

CRITICAL

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Remote Code Execution

March 7, 2026

CWE-89

CRITICAL RISK

CRITICAL

(9.9)

SQL Injection via PostgreSQL Array/Row Expressions (CWE-89) in WeKnora Query Engine

Remote Code Execution via SQL Injection on the Database Server

March 7, 2026

Vulnerability Type

Category:

Code Injection

CWE:

CWE-94;CWE-184;CWE-1336

Impact:

Remote Code Execution and Sensitive Data Exposure

Severity:

CRITICAL RISK

(9.1)

CVSS Version:

3.1

Vulnerability Type

Category:

Code Injection

CWE:

CWE-94;CWE-184;CWE-1336

Impact:

Remote Code Execution and Sensitive Data Exposure

Severity:

CRITICAL RISK

(9.1)

CVSS Version:

3.1

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Made with Love in San Francisco

355 Bryant St. San Francisco, CA 94107, USA

Ask AI for summary of CodeAnt

Improper PHP Function Blocking Leading to Code Injection (CWE-94) in Craft CMS Twig Arrow Functions

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

Recent Vulnerabilities

CRITICAL RISK

CRITICAL

(9.9)

Command Injection in MCP Stdio Configuration Validation (CWE-78) in WeKnora

CRITICAL RISK

CRITICAL

(9.9)

SQL Injection via PostgreSQL Array/Row Expressions (CWE-89) in WeKnora Query Engine

Vulnerability Type

Vulnerability Type

Vulnerability Type

Catch This CVE While Code Is Being Written

Ship clean & secure code faster

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