GHSA-mvh4-2cm2-6hpg
MEDIUMStored XSS in n8n LangChain Chat Trigger Node via initialMessages Parameter
EPSS Exploitation Probability
EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.
Blast Radius
n8nReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects npm packages — download data is not available via public APIs for these ecosystems.
Description
Impact
A stored Cross-Site Scripting (XSS) vulnerability was identified in the @n8n/n8n-nodes-langchain.chatTrigger node in n8n. If an authorized user configures the node with malicious JavaScript in the initialMessages field and enables public access, the script will be executed in the browser of anyone who visits the resulting public chat URL.
This vulnerability could be exploited for phishing or to steal cookies or other sensitive data from users who access the public chat link, posing a security risk.
Patches
This issue has been patched in version 1.107.0 of n8n. Users should upgrade to version 1.107.0 or later.
Workarounds
Disabling the n8n-nodes-langchain.chatTrigger node (docs)
References
#18148
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 📦npm | n8n | ≥ 1.24.0&&< 1.107.0 | 1.107.0 |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for n8n. O3's reachability analysis confirms whether the vulnerable code path is actually invoked in your application, so you act on real exposure instead of every transitive match.
Fix
Update n8n to 1.107.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-mvh4-2cm2-6hpg is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.
How O3 protects you
O3 pinpoints whether GHSA-mvh4-2cm2-6hpg is reachable in your code and exactly where to fix it, then blocks exploitation in production at runtime until the patched version is deployed.
Tailored to GHSA-mvh4-2cm2-6hpg. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.
Frequently Asked Questions
Is GHSA-mvh4-2cm2-6hpg in your dependencies?
O3 detects GHSA-mvh4-2cm2-6hpg across npm dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.