# CVE-2026-17496: NoteGen chat preview XSS via unsanitized AI/skill HTML rendering

> Attackers can execute arbitrary JavaScript in the NoteGen desktop application by injecting malicious HTML into AI chat responses rendered without sanitization.

- **Severity:** High 8.1 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 26 Jul 2026
- **Updated:** 27 Jul 2026
- **Also known as:** GHSA-gwhc-vprp-gfcg

## What is CVE-2026-17496?

CVE-2026-17496 is a high-severity cross-site scripting vulnerability in codexu NoteGen, published on 26 Jul 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

NoteGen before 0.32.0 renders AI chat responses with markdown-it configured with html:true and injects the result into the DOM via dangerouslySetInnerHTML in chat-preview, without HTML sanitization and with CSP set to null. Attacker-controlled content that reaches the model prompt (for example a malicious skill REFERENCE.md that instructs the model to emit HTML) can cause the model response to include executable markup such as an img onerror handler. When the user views the chat response, that markup runs as JavaScript in the privileged Tauri webview, enabling arbitrary script execution in the application context (cross-site scripting).

Weakness: CWE-79 (Improper Neutralization of Input During Web Page Generation)

## Which versions are affected by CVE-2026-17496?

It affects 1 product.


Products: Notegen Notegen.

## How do I fix CVE-2026-17496?

No fix has been published for CVE-2026-17496 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-17496 being exploited?

There is no known exploitation of CVE-2026-17496 in the wild and no public exploit code.

## Other vulnerabilities in codexu NoteGen

- [CVE-2026-17497](https://insights.sbomify.com/CVE-2026-17497/): NoteGen arbitrary OS command execution via Tauri shell:allow-execute for bash/python (high 8.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-17496 and fix it if it is affected.

What it is: CVE-2026-17496 is a high-severity cross-site scripting vulnerability in codexu NoteGen, published on 26 Jul 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2026-17496 in the wild and no public exploit code.

Affected product: codexu NoteGen. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-17496/ (Markdown: https://insights.sbomify.com/CVE-2026-17496/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-17496
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-17496
- OSV: https://osv.dev/vulnerability/CVE-2026-17496

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-17496/
Summaries are generated and may contain mistakes; the official description above is the record.