Is this vulnerability remotely exploitable?

Yes, in many setups. If an attacker can influence template content, helper arguments, or context data consumed by helpers that write to the data context, they may be able to trigger this issue remotely via normal application entry points (e.g., HTTP requests).

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

An attacker needs sufficient influence over the data that flows into Handlebars helpers which can modify the context, or over the templates themselves. Direct server access is not required if the application exposes such helpers to user-controlled input.

What is the safest general fix pattern?

Move server-side rendering to the runtime-only Handlebars build without `compile()`, upgrade to a fixed Handlebars version, and refactor helpers so they treat the context as read-only—never overwriting special variables like `@partial-block`.

Severity:

HIGH RISK

(8.1)

Code Injection via Mutable @partial-block (CWE-94) in Handlebars Server-Side Templates

CVE-2026-33938

Published:

Mar 27, 2026

Status:

Modified

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-77;CWE-78

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setGameSpeedCfg CGI Handler

Remote Code Execution on the Router

April 6, 2026

CWE-77;CWE-78

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setFirewallType Handler

Remote Code Execution on Router Firmware

April 6, 2026

Vulnerability Type

Category:

Code Injection

CWE:

CWE-94;CWE-843

Impact:

Server-Side Remote Code Execution

Severity:

HIGH RISK

(8.1)

CVSS Version:

3.1

Vulnerability Type

Category:

Code Injection

CWE:

CWE-94;CWE-843

Impact:

Server-Side Remote Code Execution

Severity:

HIGH RISK

(8.1)

CVSS Version:

3.1

Catch This CVE While Code Is Being Written

Detect vulnerable code directly in pull requests, so CVEs are fixed before merge.

Get Started

Ship clean & secure code faster

START 14 DAYS FREE TRIAL

BOOK A DEMO

Made with Love in San Francisco

355 Bryant St. San Francisco, CA 94107, USA

Ask AI for summary of CodeAnt

Made with Love in San Francisco

355 Bryant St. San Francisco, CA 94107, USA

Ask AI for summary of CodeAnt

Made with Love in San Francisco

355 Bryant St. San Francisco, CA 94107, USA

Ask AI for summary of CodeAnt

Code Injection via Mutable @partial-block (CWE-94) in Handlebars Server-Side Templates

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

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setGameSpeedCfg CGI Handler

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setFirewallType Handler

Vulnerability Type

Vulnerability Type

Vulnerability Type

Catch This CVE While Code Is Being Written

Ship clean & secure code faster

Product

Pricing

Company

Legal

Developers

Compare

Product

Pricing

Company

Legal

Developers

Compare

Product

Pricing

Company

Legal

Developers

Compare