# Next.js: Unauthenticated Remote Code Execution on windows-hosted servers

Advisory record · `GHSA-p293-qw3h-jr36`

- **Identifiers:** `GHSA-p293-qw3h-jr36` · `CVE-2026-75604`
- **State:** Confirmed
- **Severity:** CVSS 9.0 Critical
- **Critical:** Yes: CVSS 9+
- **Weakness (CWE):** [CWE-22](https://cwe.mitre.org/data/definitions/22.html)
- **Tags:** [Path traversal](https://agentprime.io/advisories/tag/path-traversal.md)
- **Published:** 8 Sept 2026
- **Updated:** 8 Sept 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 8 Sept 2026, 20:51 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Critical

Critical, because:

- CVSS score 9.0: 9.0 or more.

How we decide what’s critical: <https://agentprime.io/advisories/critical.md>

## Affected packages

- `next` (npm): affected `>=13.4.0, <15.5.24 || >=16.0.0, <16.3.3`; fixed in `15.5.24`, `16.3.3`

## 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

- 9.0 Critical, CVSS 3.1: `CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H`, from CNA (GitHub_M)

- **CISA KEV:** Not listed.
- **EPSS:** 0.021, the 81st percentile, on 11 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 25 Aug 2026, 16:15 UTC: [Published by the maintainers as a GitHub repository advisory](https://github.com/vercel/next.js/security/advisories/GHSA-p293-qw3h-jr36)

## Sources

- [GitHub Advisory Database: GHSA-p293-qw3h-jr36](https://github.com/advisories/GHSA-p293-qw3h-jr36)
- [OSV: GHSA-p293-qw3h-jr36](https://osv.dev/vulnerability/GHSA-p293-qw3h-jr36)
- <https://github.com/vercel/next.js/security/advisories/GHSA-p293-qw3h-jr36>
- <https://nvd.nist.gov/vuln/detail/CVE-2026-75604>
- <https://github.com/vercel/next.js/commit/968b9fcb26bdeb8e0a861a9df05361474666d51b>
- <https://github.com/vercel/next.js/commit/b0f3460a92b955d3ca41fccff9a525a2b910fbf3>
- <https://github.com/vercel/next.js>
- <https://github.com/vercel/next.js/releases/tag/v15.5.24>
- <https://github.com/vercel/next.js/releases/tag/v16.3.3>

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-p293-qw3h-jr36>, 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-p293-qw3h-jr36/>. Everything for agents: <https://agentprime.io/llms.txt>.