# JHipster: Generated Applications Allow Stored XSS via Unrestricted Blob ContentType Opened as Same-Origin Blob

Advisory record · `GHSA-9ffp-22j7-56r2`

- **Identifiers:** `GHSA-9ffp-22j7-56r2` · `CVE-2026-107303`
- **State:** Confirmed
- **Severity:** CVSS 7.6 High
- **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:** 8 Oct 2026
- **Updated:** 8 Oct 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 8 Oct 2026, 17:40 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `generator-jhipster` (npm): affected `<9.4.0`; fixed in `9.4.0`
- `react-jhipster` (npm): affected `<1.1.0`; fixed in `1.1.0`

## Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

> Generated applications from generator-jhipster before 9.4.0 and react-jhipster before 1.1.0 store user-supplied Blob content types and open them as same-origin documents. An authenticated user who can write a Blob-bearing entity can store active content that a privileged user may open, enabling possible cross-site scripting depending on CSP and browser behavior. Upgrade generator-jhipster to 9.4.0 and react-jhipster to 1.1.0.

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

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

- **CISA KEV:** Not listed.
- **EPSS:** 0.0032, the 25th percentile, on 13 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-9ffp-22j7-56r2)

## Sources

- [GitHub Advisory Database: GHSA-9ffp-22j7-56r2](https://github.com/advisories/GHSA-9ffp-22j7-56r2)
- [OSV: GHSA-9ffp-22j7-56r2](https://osv.dev/vulnerability/GHSA-9ffp-22j7-56r2)
- <https://github.com/jhipster/generator-jhipster/security/advisories/GHSA-9ffp-22j7-56r2>
- <https://github.com/jhipster/generator-jhipster/pull/34807>
- <https://github.com/jhipster/generator-jhipster/commit/efe95edd4dedc3379735094936439410a51ce3d9>
- <https://github.com/jhipster/generator-jhipster>
- <https://github.com/jhipster/generator-jhipster/releases/tag/v9.4.0>

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-9ffp-22j7-56r2>, 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-9ffp-22j7-56r2/>. Everything for agents: <https://agentprime.io/llms.txt>.