CVE-2026-54309: n8n is an open source workflow automation platform

Q: How do I fix CVE-2026-54309?

n8n: upgrade to 2.25.7, 2.26.2. Exact commands for each OS are on this page.

Q: Is CVE-2026-54309 being exploited?

CVE-2026-54309 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-54309 affect?

CVE-2026-54309 affects n8n. Severity is critical (CVSS 10.0). 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. An

Q: How urgent is CVE-2026-54309?

Priority 51/100. Critical severity; Remotely exploitable, no login, no user action

This month

CRITICAL 10.0REMOTEUPGRADE

CVE-2026-54309 is a critical-severity flaw (CVSS 10.0) affecting n8n. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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

Why this priority

Critical severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	10.0 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.5% (top 55%)
CISA exploited list	No
Weakness	CWE-306
Published	2026-06-23
Last modified	2026-10-26

Publisher (CNA): GitHub, Inc. · Vendor: n8n

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-06-23 16:17 UTCPublished CVE record published
2026-10-26 11:10 UTCUpdated Record last modified

n8n n8n UPGRADE

Affected: < 2.25.7 · >= 2.26.0 and < 2.26.2

Fixed in: 2.25.7, 2.26.2

Safe to downgrade to: a release before 2.26.0

1. Check installed version

npm ls n8n

2. UPGRADE to 2.25.7

npm install n8n@">=2.25.7"

3. If no update is available yet, DOWNGRADE to a release before 2.26.0

npm view n8n versions npm install n8n@"<2.26.0"

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-54309?

n8n: upgrade to 2.25.7, 2.26.2. Exact commands for each OS are on this page.

Is CVE-2026-54309 being exploited?

CVE-2026-54309 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-54309 affect?

CVE-2026-54309 affects n8n. Severity is critical (CVSS 10.0). 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. An

How urgent is CVE-2026-54309?

Priority 51/100. Critical severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2026-54310 CRITICAL 9.9 UPGRADE n8n is an open source workflow automation platform
CVE-2026-44789 CRITICAL 9.9 UPGRADE n8n is an open source workflow automation platform
CVE-2026-44791 CRITICAL 9.9 UPGRADE n8n is an open source workflow automation platform
CVE-2026-54314 HIGH 7.5 UPGRADE n8n is an open source workflow automation platform
CVE-2026-44790 HIGH 8.8 UPGRADE n8n is an open source workflow automation platform

References

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