How severe is CVE-2026-56357?

CVE-2026-56357 has a CVSS 3.x base score of 4.0, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.

Is CVE-2026-56357 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (8th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-56357?

CVE-2026-56357 primarily affects N8n. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2026-56357?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-56357 have an EU (EUVD) identifier?

Yes. CVE-2026-56357 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-38377.

When was CVE-2026-56357 published?

CVE-2026-56357 was published on 2026-06-22 and last updated on 2026-06-24.

CVE-2026-56357

CVE-2026-56357 is a medium-severity vulnerability in N8n with a CVSS 3.x base score of 4.0. 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-290.

Key facts

Severity: Medium (CVSS 3.x base score 4.0)
CVSS v4: 6.3
EPSS exploit prediction: 0% (8th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-38377
Weakness: CWE-290
Affected product: N8n
Published: 2026-06-22
Last modified: 2026-06-24

Description

n8n before 1.123.15 and 2.5.0 contains a webhook forgery vulnerability in the GitHub Webhook Trigger node that fails to implement HMAC-SHA256 signature verification. Attackers who know the webhook URL can send unsigned POST requests to trigger workflows with arbitrary data, spoofing GitHub webhook events.

Frequently asked questions

What is CVE-2026-56357?: n8n before 1.123.15 and 2.5.0 contains a webhook forgery vulnerability in the GitHub Webhook Trigger node that fails to implement HMAC-SHA256 signature verification. Attackers who know the webhook URL can send unsigned POST requests to trigger workflows with arbitrary data, spoofing GitHub webhook events.
How severe is CVE-2026-56357?: CVE-2026-56357 has a CVSS 3.x base score of 4.0, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.
Is CVE-2026-56357 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (8th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-56357?: CVE-2026-56357 primarily affects N8n. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2026-56357?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-56357 have an EU (EUVD) identifier?: Yes. CVE-2026-56357 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-38377.
When was CVE-2026-56357 published?: CVE-2026-56357 was published on 2026-06-22 and last updated on 2026-06-24.

References

Affected products (2)

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

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