# CVE-2026-33749: n8n Vulnerable to XSS via Binary Data Inline HTML Rendering

> Authenticated users can inject JavaScript via binary data, allowing attackers to execute code in victims' sessions and escalate privileges.

- **Severity:** Medium 6.3 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:L/VI:L/VA:N/SC:H/SI:H/SA:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** Yes
- **Published:** 25 Mar 2026
- **Updated:** 25 Mar 2026
- **Also known as:** GHSA-qfc3-hm4j-7q77

## What is CVE-2026-33749?

CVE-2026-33749 is a medium-severity cross-site scripting vulnerability in N8n N8n, published on 25 Mar 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

### Official description

n8n is an open source workflow automation platform. Prior to versions 1.123.27, 2.13.3, and 2.14.1, an authenticated user with permission to create or modify workflows could craft a workflow that produces an HTML binary data object without a filename. The `/rest/binary-data` endpoint served such responses inline on the n8n origin without `Content-Disposition` or `Content-Security-Policy` headers, allowing the HTML to render in the browser with full same-origin JavaScript access. By sending the resulting URL to a higher-privileged user, an attacker could execute JavaScript in the victim's authenticated session, enabling exfiltration of workflows and credentials, modification of workflows, or privilege escalation to admin. The issue has been fixed in n8n versions 1.123.27, 2.13.3, and 2.14.1. Users should upgrade to one of these versions or later to remediate the vulnerability. If upgrading is not immediately possible, administrators should consider the following temporary mitigations: Limit workflow creation and editing permissions to fully trusted users only, and/or restrict network access to the n8n instance to prevent untrusted users from accessing binary data URLs. These workarounds do not fully remediate the risk and should only be used as short-term mitigation measures.

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

## Which versions are affected by CVE-2026-33749?

6 open source packages ship an affected version, including n8n. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `n8n` | npm | All versions | 1.123.27 |
| `n8n` | npm | All versions | 1.123.27 |
| `n8n` | npm | From 2.0.0-rc.0 | 2.13.3 |
| `n8n` | npm | From 2.0.0-rc.0 | 2.13.3 |
| `n8n` | npm | From 2.14.0 | 2.14.1 |
| `n8n` | npm | From 2.14.0 | 2.14.1 |

Products: N8n N8n.

## How do I fix CVE-2026-33749?

Upgrade n8n to a fixed version for your release line: 1.123.27, 2.13.3 or 2.14.1.

## Is CVE-2026-33749 being exploited?

There is no known exploitation of CVE-2026-33749 in the wild and no public exploit code.

## Other vulnerabilities in N8n N8n

- [CVE-2025-68613](https://insights.sbomify.com/CVE-2025-68613/): n8n Improper Control of Dynamically-Managed Code Resources (critical 10.0, exploited in the wild)
- [CVE-2026-21877](https://insights.sbomify.com/CVE-2026-21877/): n8n is vulnerable to Remote Code Execution via Arbitrary File Write (critical 10.0)
- [CVE-2026-21858](https://insights.sbomify.com/CVE-2026-21858/): n8n Vulnerable to Unauthenticated File Access via Improper Webhook Request Handling (critical 10.0)
- [CVE-2026-1470](https://insights.sbomify.com/CVE-2026-1470/): n8n Unsafe Workflow Expression Evaluation Allows Remote Code Execution (critical 9.9)
- [CVE-2025-68668](https://insights.sbomify.com/CVE-2025-68668/): n8n Vulnerable to Arbitrary Command Execution in Pyodide based Python Code Node (critical 9.9)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-33749 and fix it if it is affected.

What it is: CVE-2026-33749 is a medium-severity cross-site scripting vulnerability in N8n N8n, published on 25 Mar 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2026-33749 in the wild and no public exploit code.

Affected packages and fixed versions:
- n8n (npm): affected all versions; fixed in 1.123.27
- n8n (npm): affected all versions; fixed in 1.123.27
- n8n (npm): affected from 2.0.0-rc.0; fixed in 2.13.3
- n8n (npm): affected from 2.0.0-rc.0; fixed in 2.13.3
- n8n (npm): affected from 2.14.0; fixed in 2.14.1
- n8n (npm): affected from 2.14.0; fixed in 2.14.1

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-2026-33749/ (Markdown: https://insights.sbomify.com/CVE-2026-33749/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-33749
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-33749
- OSV: https://osv.dev/vulnerability/CVE-2026-33749

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-33749/
Summaries are generated and may contain mistakes; the official description above is the record.