# Duplicate Advisory: SvelteKit before 3.0.0 XSS via Cache-Control Header in Prerendered Pages

Advisory record · `GHSA-85pr-xr59-r75h` · Withdrawn

- **Identifiers:** `GHSA-85pr-xr59-r75h`
- **State:** Withdrawn
- **Severity:** CVSS 4.7 Medium
- **Critical:** No
- **Weakness (CWE):** [CWE-79](https://cwe.mitre.org/data/definitions/79.html)
- **Tags:** [Cross-site scripting (XSS)](https://agentprime.io/advisories/tag/xss.md)
- **Published:** 21 Oct 2026
- **Updated:** 23 Oct 2026
- **Reviewed by a person:** No

**Withdrawn.** The GitHub Advisory Database withdrew this advisory on 23 Oct 2026. The record stays here, marked withdrawn.

Published by the GitHub Advisory Database at 21 Oct 2026, 03:32 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `@sveltejs/kit` (npm): affected `all versions`; no fixed version yet

## 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 GitHub Advisory Database

- **CISA KEV:** Not listed.
- **EPSS:** No score.

## 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-85pr-xr59-r75h)

## Sources

- [GitHub Advisory Database: GHSA-85pr-xr59-r75h](https://github.com/advisories/GHSA-85pr-xr59-r75h)
- [OSV: GHSA-85pr-xr59-r75h](https://osv.dev/vulnerability/GHSA-85pr-xr59-r75h)
- <https://github.com/sveltejs/kit/security/advisories/GHSA-27mw-82g8-phjj>
- <https://nvd.nist.gov/vuln/detail/CVE-2026-114061>
- <https://www.vulncheck.com/advisories/sveltekit-before-3.0.0-xss-via-cache-control-header-in-prerendered-pages>

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-85pr-xr59-r75h>, 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-85pr-xr59-r75h/>. Everything for agents: <https://agentprime.io/llms.txt>.