Auth bypass in N8n
CVE-2026-86077
n8n is an open source workflow automation platform. Prior to 2.37.7 and 2.38.2, the /chat WebSocket route accepted a resumeToken and resumed a paused execution without checking that the target node supported chat messages. An anonymous form submitter who received that token could reuse it on the chat route to release a Send-and-Wait, non-chat HITL, or Wait approval gate. The affected authorization logic is packages/cli/src/chat/chat-execution-manager.ts, where canResumeOverChat did not gate the resume target. This issue is fixed in versions 2.37.7 and 2.38.2.
Vulnerability class: Broken Access Control
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.004 (36.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 36th percentile — 36.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000
Affected products
- N8n
- N8n-Io N8n — versions < 2.37.7, >= 2.38.0, < 2.38.2
Weakness classification (CWE)
References
- github.com/n8n-io/n8n/security/advisories/GHSA-35jj-42hp-8gmq (Mitigation, Vendor Advisory)
- github.com/n8n-io/n8n/releases/tag/n8n@2.37.7 (Release Notes)
- github.com/n8n-io/n8n/releases/tag/n8n@2.38.2 (Release Notes)
Frequently asked questions
- What is CVE-2026-86077?
- CVE-2026-86077 is a medium-severity vulnerability in N8n, classified under Missing Authorization. CVSS score: 6.5/10. Published 2026-09-08.
- How severe is CVE-2026-86077?
- Medium severity. CVSS v3 base score is 6.5 out of 10.