CVE-2026-42235
Description
n8n is an open source workflow automation platform. Prior to versions 1.123.32, 2.17.4, and 2.18.1, an unauthenticated attacker could register a malicious MCP OAuth client with a crafted client_name. If a victim user authorized the OAuth consent dialog and a second user subsequently revoked that access, a toast notification would render the injected script. Clicking the link would execute arbitrary JavaScript in the victim's authenticated n8n browser session, enabling credential and session token theft, workflow manipulation, or privilege escalation. This issue has been patched in versions 1.123.32, 2.17.4, and 2.18.1.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
n8nnpm | < 1.123.32 | 1.123.32 |
n8nnpm | >= 2.18.0, < 2.18.1 | 2.18.1 |
n8nnpm | >= 2.17.0, < 2.17.4 | 2.17.4 |
Affected products
2Patches
Vulnerability mechanics
References
3- github.com/advisories/GHSA-537j-gqpc-p7fqghsaADVISORY
- github.com/n8n-io/n8n/security/advisories/GHSA-537j-gqpc-p7fqnvdVendor AdvisoryWEB
- nvd.nist.gov/vuln/detail/CVE-2026-42235ghsaADVISORY
News mentions
0No linked articles in our index yet.