# Handlebars: JavaScript Injection via Unsafe Inline Embedding of Precompiled Templates

Advisory record · `GHSA-xw65-4hp5-5hc7`

- **Identifiers:** `GHSA-xw65-4hp5-5hc7` · `CVE-2026-106444`
- **State:** Confirmed
- **Severity:** CVSS 4.7 Medium
- **Critical:** No
- **Weakness (CWE):** [CWE-116](https://cwe.mitre.org/data/definitions/116.html)
- **Tags:** [CWE-116](https://agentprime.io/advisories/tag/cwe-116.md)
- **Published:** 8 Oct 2026
- **Updated:** 8 Oct 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 8 Oct 2026, 17:52 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `handlebars` (npm): affected `>=4.0.0, <4.7.10`; fixed in `4.7.10`

## Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

## Severity and exploitation

- 4.7 Medium, CVSS 3.1: `CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N`, from CNA (GitHub_M)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0029, the 21st percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 31 Oct 2026, 13:33 UTC: First seen by agentprime
- 31 Oct 2026, 13:33 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-xw65-4hp5-5hc7)

## Sources

- [GitHub Advisory Database: GHSA-xw65-4hp5-5hc7](https://github.com/advisories/GHSA-xw65-4hp5-5hc7)
- [OSV: GHSA-xw65-4hp5-5hc7](https://osv.dev/vulnerability/GHSA-xw65-4hp5-5hc7)
- <https://github.com/handlebars-lang/handlebars.js/security/advisories/GHSA-xw65-4hp5-5hc7>
- <https://nvd.nist.gov/vuln/detail/CVE-2026-106444>
- <https://github.com/handlebars-lang/handlebars.js/pull/2185>
- <https://github.com/handlebars-lang/handlebars.js/commit/609d1b11c833c9a3e00f56f2f34d22f425446725>
- <https://github.com/handlebars-lang/handlebars.js>
- <https://github.com/handlebars-lang/handlebars.js/releases/tag/v4.7.10>

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.

## Check whether this affects you

A Match means an installed version is in the affected range above. Most don’t affect the app; agentprime hasn’t analysed this one yet.

- With the agentprime MCP server (<https://api.agentprime.io/mcp>), ask your agent to check the project: `check_lockfile` sends a lockfile, `check_packages` a list of installed packages, and both return the Matches and the upgrades that clear them. `get_advisory` returns this record. Setup: <https://agentprime.io/mcp.md>
- In a browser: <https://agentprime.io/check/> reads your lockfile in the browser, never uploading it.
- Whether it touches your code, with file and line: the Claude Code plugin, <https://agentprime.io/plugin.md>
- As JSON: <https://api.agentprime.io/v1/advisories/GHSA-xw65-4hp5-5hc7>, or `POST https://api.agentprime.io/v1/match` with your packages (<https://agentprime.io/api.md>)

---

The web page: <https://agentprime.io/advisories/GHSA-xw65-4hp5-5hc7/>. Everything for agents: <https://agentprime.io/llms.txt>.