# @nuxt/webpack-builder and @nuxt/rspack-builder dev server same-origin check bypassed when Sec-Fetch-Site, Origin, and Referer are all absent (incomplete fix for GHSA-6m52-m754-pw2g)

Advisory record · `GHSA-x6qj-4h56-5rj5`

- **Identifiers:** `GHSA-x6qj-4h56-5rj5` · `CVE-2026-49993`
- **State:** Confirmed
- **Severity:** CVSS 5.9 Medium
- **Critical:** No
- **Weakness (CWE):** [CWE-749](https://cwe.mitre.org/data/definitions/749.html)
- **Tags:** [CWE-749](https://agentprime.io/advisories/tag/cwe-749.md)
- **Published:** 16 Jun 2026
- **Updated:** 10 Sept 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 16 Jun 2026, 23:39 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `@nuxt/webpack-builder` (npm): affected `>=4.0.0, <4.4.7 || >=3.15.4, <3.21.7`; fixed in `4.4.7`, `3.21.7`
- `@nuxt/rspack-builder` (npm): affected `>=4.0.0, <4.4.7 || >=3.15.4, <3.21.7`; fixed in `4.4.7`, `3.21.7`

## 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

- 5.9 Medium, CVSS 4.0: `CVSS:4.0/AV:A/AC:H/AT:P/PR:N/UI:P/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N`, from CNA (GitHub_M)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0028, the 20th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

This record came from the full history of the GitHub Advisory Database, published 16 Jun 2026. New records show when each source confirmed them.

## Sources

- [GitHub Advisory Database: GHSA-x6qj-4h56-5rj5](https://github.com/advisories/GHSA-x6qj-4h56-5rj5)
- [OSV: GHSA-x6qj-4h56-5rj5](https://osv.dev/vulnerability/GHSA-x6qj-4h56-5rj5)
- <https://github.com/nuxt/nuxt/security/advisories/GHSA-6m52-m754-pw2g>
- <https://github.com/nuxt/nuxt/security/advisories/GHSA-x6qj-4h56-5rj5>
- <https://nvd.nist.gov/vuln/detail/CVE-2026-49993>
- <https://github.com/nuxt/nuxt/pull/35200>
- <https://github.com/nuxt/nuxt/commit/77187ee4015e9267fb464951542a3e09e8b5fa05>
- <https://github.com/nuxt/nuxt/commit/e351de943e82db16970618b60dc7fdbaa58630f3>
- <https://github.com/nuxt/nuxt>

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-x6qj-4h56-5rj5>, or `POST https://api.agentprime.io/v1/match` with your packages (<https://agentprime.io/api.md>)

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The web page: <https://agentprime.io/advisories/GHSA-x6qj-4h56-5rj5/>. Everything for agents: <https://agentprime.io/llms.txt>.