Is CVE-2026-33916 actively exploited?

No active exploitation of CVE-2026-33916 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-33916 be exploited remotely?

Yes. CVE-2026-33916 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-33916?

CVE-2026-33916 has a CVSS score of 4.7 (MEDIUM).

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MEDIUM

CVE-2026-33916

CWE-79Published: March 27, 2026· Updated: Mar 31, 2026

4.7

CVSS v3.1

EPSS:0.03%probability of exploitation in 30 daysPercentile:8.3th

Official Description

Handlebars provides the power necessary to let users build semantic templates. In versions 4.0.0 through 4.7.8, `resolvePartial()` in the Handlebars runtime resolves partial names via a plain property lookup on `options.partials` without guarding against prototype-chain traversal. When `Object.prototype` has been polluted with a string value whose key matches a partial reference in a template, the polluted string is used as the partial body and rendered without HTML escaping, resulting in reflected or stored XSS. Version 4.7.9 fixes the issue. Some workarounds are available. Apply `Object.freeze(Object.prototype)` early in application startup to prevent prototype pollution. Note: this may break other libraries, and/or use the Handlebars runtime-only build (`handlebars/runtime`), which does not compile templates and reduces the attack surface.

NVD Source

Technical Analysis

CVE-2026-33916 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation does not require any privileges, though user interaction (Required) is needed, which slightly reduces the risk of mass automated attacks.

The vulnerability has a "Changed" scope, meaning successful exploitation can impact components beyond the vulnerable component itself — such as the host operating system or adjacent services.

From a weakness classification perspective (CWE-79): Cross-site scripting (XSS) vulnerabilities allow attackers to inject malicious scripts into web pages viewed by other users.