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CVE-2026-54309

HIGH
8.8
CVSS 4.0
Description
n8n is an open source workflow automation platform. Prior to 2.25.7 and 2.26.2, when @n8n/mcp-browser is run in HTTP transport mode, the MCP endpoint accepts session initialization and tool invocation requests without any authentication. Any network-reachable client, or any website visited by the user, can establish an MCP session and invoke browser-control tools. Where the n8n AI Browser Bridge extension is installed and a browser connection is active, an unauthenticated caller can access browser-control capabilities including navigation, JavaScript evaluation, and cookie and storage access against the user's real browser profile. This issue only affects instances where @n8n/mcp-browser is run with the HTTP transport (--transport http). This vulnerability is fixed in 2.25.7 and 2.26.2.

Metadata

CVE ID
CVE-2026-54309
State
PUBLISHED
Assigner
GitHub_M
Reserved
2026-06-12 18:42 UTC
Published
2026-06-23 15:36 UTC
Last updated
2026-06-23 15:45 UTC
Primary CWE
CWE-306
CWE-306: Missing Authentication for Critical Function
Vendor / Product
n8n-io / n8n
Sources
cve.org  ·  NVD

Severity & Metrics

8.8 HIGH CVSS 4.0
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:H/VA:L/SC:N/SI:N/SA:N
SSVC — CISA Coordinator
Exploitation
none
Automatable
yes
Tech. Impact
partial
Affected products (1)
VendorProductPlatformVersions
n8n-io n8n — >= 2.26.0, < 2.26.2, < 2.25.7
Weakness (CWE)
CWESourceDescription
CWE-306 cna CWE-306: Missing Authentication for Critical Function
CVSS scores (1)
ScoreSeverityVersionSourceVector
8.8 HIGH 4.0 cna CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:H/VA:L/SC:N/SI:N/SA:N
References (1)
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