How severe is CVE-2026-54311?

CVE-2026-54311 has a CVSS 3.x base score of 7.7, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2026-54311 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (23rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-54311?

CVE-2026-54311 affects N8n. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-54311?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-54311 have an EU (EUVD) identifier?

Yes. CVE-2026-54311 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-38471.

When was CVE-2026-54311 published?

CVE-2026-54311 was published on 2026-06-23 and last updated on 2026-06-25.

CVE-2026-54311

CVE-2026-54311 is a high-severity vulnerability in N8n with a CVSS 3.x base score of 7.7. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-488.

Key facts

Severity: High (CVSS 3.x base score 7.7)
CVSS v4: 6.0
EPSS exploit prediction: 0% (23rd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-38471
Weakness: CWE-488
Affected product: N8n
Published: 2026-06-23
Last modified: 2026-06-25

Description

n8n is an open source workflow automation platform. Prior to 2.25.7 and 2.26.2, an authenticated user with permission to create or modify workflows could pollute the sandbox used by the Merge node's SQL Query mode. Because the sandbox context was cached and reused across all workflow executions on the instance, prototype mutations introduced by one user's workflow persist into subsequent Merge SQL executions belonging to other users or projects. This allowed a low-privileged attacker to intercept workflow data processed by other users on the same instance. This issue only affects multi-user n8n instances where more than one user has permission to create and execute workflows containing the Merge node in SQL Query mode. This vulnerability is fixed in 2.25.7 and 2.26.2.

Frequently asked questions

What is CVE-2026-54311?: n8n is an open source workflow automation platform. Prior to 2.25.7 and 2.26.2, an authenticated user with permission to create or modify workflows could pollute the sandbox used by the Merge node's SQL Query mode. Because the sandbox context was cached and reused across all workflow executions on the instance, prototype mutations introduced by one user's workflow persist into subsequent Merge SQL executions belonging to other users or projects. This allowed a low-privileged attacker to intercept workflow data processed by other users on the same instance. This issue only affects multi-user n8n instances where more than one user has permission to create and execute workflows containing the Merge node in SQL Query mode. This vulnerability is fixed in 2.25.7 and 2.26.2.
How severe is CVE-2026-54311?: CVE-2026-54311 has a CVSS 3.x base score of 7.7, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2026-54311 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (23rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-54311?: CVE-2026-54311 affects N8n. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-54311?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-54311 have an EU (EUVD) identifier?: Yes. CVE-2026-54311 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-38471.
When was CVE-2026-54311 published?: CVE-2026-54311 was published on 2026-06-23 and last updated on 2026-06-25.

References

https://github.com/n8n-io/n8n/security/advisories/GHSA-9c38-2mcm-q7f7

Affected products (1)

cpe:2.3:a:n8n:n8n:*:*:*:*:*:node.js:*:*

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