# Ghost: Stored XSS via File Uploads on Local Storage Advisory record · `GHSA-gfjp-2p8f-94qv` - **Identifiers:** `GHSA-gfjp-2p8f-94qv` · `BIT-ghost-2026-104411` · `BIT-ghost-2026-105679` · `CVE-2026-104411` · `CVE-2026-105679` - **State:** Confirmed - **Severity:** CVSS 8.5 High - **Critical:** No - **Weakness (CWE):** [CWE-79](https://cwe.mitre.org/data/definitions/79.html) · [CWE-434](https://cwe.mitre.org/data/definitions/434.html) - **Tags:** [Cross-site scripting (XSS)](https://agentprime.io/advisories/tag/xss.md) · [Unrestricted file upload](https://agentprime.io/advisories/tag/file-upload.md) - **Published:** 7 Oct 2026 - **Updated:** 13 Oct 2026 - **Reviewed by a person:** No Published by the GitHub Advisory Database at 7 Oct 2026, 20:25 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. ## Affected packages - `ghost` (npm): affected `>=6.22.1, <6.64.0`; fixed in `6.64.0` ## Machine-written summary Summary written by Claude Haiku from the source advisory. Not reviewed by a person. > The npm package ghost versions from 6.22.1 up to but not including 6.64.0 are affected. On sites using the default local storage adapter, uploaded files were served with a content type derived from their extension, without the restriction meant to stop browsers from running them. An attacker who can upload files as a staff user could host scripts on the site's domain, potentially compromising other staff users' admin sessions. Upgrade to Ghost 6.64.0 or later, which contains the fix. Written 31 Oct 2026. ## 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 - 8.5 High, CVSS 4.0: `CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N`, from CNA (VulnCheck) - **CISA KEV:** Not listed. - **EPSS:** 0.0026, the 17th 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-gfjp-2p8f-94qv) ## Sources - [GitHub Advisory Database: GHSA-gfjp-2p8f-94qv](https://github.com/advisories/GHSA-gfjp-2p8f-94qv) - [OSV: GHSA-gfjp-2p8f-94qv](https://osv.dev/vulnerability/GHSA-gfjp-2p8f-94qv) - - - - - - 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 (), 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: - In a browser: reads your lockfile in the browser, never uploading it. - Whether it touches your code, with file and line: the Claude Code plugin, - As JSON: , or `POST https://api.agentprime.io/v1/match` with your packages () --- The web page: . Everything for agents: .