How severe is GHSA-hfmv-hhh3-43f2?

GHSA-hfmv-hhh3-43f2 has a CVSS score of 8.7/10, rated HIGH. Immediate patching is strongly recommended.

Which packages are affected by GHSA-hfmv-hhh3-43f2?

GHSA-hfmv-hhh3-43f2 affects the following packages: n8n (npm). Ecosystems affected: npm.

How do I fix GHSA-hfmv-hhh3-43f2?

Update n8n to 1.98.2 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-hfmv-hhh3-43f2 is resolved across your whole dependency graph.

How do I detect GHSA-hfmv-hhh3-43f2 in my npm dependencies?

Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for n8n, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

How do I mitigate GHSA-hfmv-hhh3-43f2 if there is no patch (or I can't update yet)?

Escape or sanitise the affected output on the server side rather than relying on client-side filtering, and add a Content-Security-Policy that blocks inline script execution so injected markup cannot run even if it reaches the page.

Is GHSA-hfmv-hhh3-43f2 actively exploited in the wild?

No public exploit code has been indexed for GHSA-hfmv-hhh3-43f2 yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

What is the EPSS score for GHSA-hfmv-hhh3-43f2?

GHSA-hfmv-hhh3-43f2 has an EPSS (Exploit Prediction Scoring System) score of 0.4%, placing it in the 34th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

What type of vulnerability is GHSA-hfmv-hhh3-43f2?

GHSA-hfmv-hhh3-43f2 is classified as Cross-site Scripting (XSS) (CWE-79). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation. This is a high-impact weakness class that often enables remote code execution or data exposure.

When was GHSA-hfmv-hhh3-43f2 published, and has it been updated?

GHSA-hfmv-hhh3-43f2 was published on August 19, 2025 and was last updated on August 19, 2025. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

📦

📦 npm

Not in CISA KEV

HIGH severity

Stored XSS in n8n Form Trigger allows Account Takeover via injected iframe and video/sourceGHSA-hfmv-hhh3-43f2

HIGHFix: n8n-io/n8n#16329

GHSA-hfmv-hhh3-43f2 is a high-severity (CVSS 8.7) Cross-site Scripting (XSS) vulnerability in n8n. A fix is available for n8n — see the affected versions and patch details below.

Also known asCVE-2025-52478

Published

Aug 19, 2025

Updated

Aug 19, 2025

Affected

1 pkg

Patched

1 / 1

Exploits

None indexed

Exploitation data as of Nov 7, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

No confirmed exploitation observed yet

A successful exploit gives an attacker total control of the affected component, not partial access.
CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.

Exploitation and automatability from CISA’s SSVC triage for GHSA-hfmv-hhh3-43f2.

EPSS Exploitation Probability

via FIRST.org ↗

0.4%probability of exploitation in next 30 days

Lower Risk0.00%

Lower risk than most CVEs34th percentile — riskier than 34% of all scored CVEsHighest risk

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

1 pkg affected

How broadly this vulnerability is actually deployed: weekly install volume shows current usage, and reverse-dependency count shows how many other packages break if it stays unpatched.

36other npm packages depend on this — each one inherits the vulnerability until it's patched upstream

n8nnpm

150Kdownloads / week

Description

Impact

A stored Cross-Site Scripting (XSS) vulnerability was identified in n8n, specifically in the Form Trigger node's HTML form element. An authenticated attacker can inject malicious HTML via an <iframe> with a srcdoc payload that includes arbitrary JavaScript execution. The attacker can also inject malicious Javascript by using <video> coupled <source> using an onerror event.

While using iframe or a combination of video and source tag, this vulnerability allows for Account Takeover (ATO) by exfiltrating n8n-browserId and session cookies from authenticated users who visit a maliciously crafted form. Using these tokens and cookies, an attacker can impersonate the victim and change account details such as email addresses, enabling full control over the account—especially if 2FA is not enabled.

Patches

The issue was addressed in PR #16329. Users should upgrade to version >=1.98.2.

Workarounds

Apart from updating to the fixed version, n8n instance administrators can:

Configure a reverse proxy to serve webhook requests from a different domain [docs].
Disable or restrict use of the Form Trigger node, particularly the HTML element type.
Use a Content Security Policy (CSP) to block execution of inline scripts and disallow use of srcdoc.

References

Affected Packages

1 total 1 fixed

Ecosystem	Package	Vulnerable range	Fix
📦npm	`n8n`	≥ 1.77.0&&< 1.98.2	1.98.2`npm install n8n@1.98.2`

Affected Products

1 product · 1 configurations

Application

n8nn8n

≥ 1.77.0 && < 1.98.2

range

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for n8n, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update n8n to 1.98.2 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-hfmv-hhh3-43f2 is resolved across your whole dependency graph.
Workarounds
Escape or sanitise the affected output on the server side rather than relying on client-side filtering, and add a Content-Security-Policy that blocks inline script execution so injected markup cannot run even if it reaches the page.

Frequently Asked Questions

### Impact A stored **Cross-Site Scripting (XSS)** vulnerability was identified in [n8n](https://github.com/n8n-io/n8n), specifically in the **Form Trigger** node's **HTML form element**. An authenticated attacker can inject malicious HTML via an `<iframe>` with a `srcdoc` payload that includes arbitrary JavaScript execution. The attacker can also inject malicious Javascript by using `<video>` coupled `<source>` using an `onerror` event. While using `iframe` or a combination of `video` and `source` tag, this vulnerability allows for Account Takeover (ATO) by exfiltrating `n8n-browserId` and