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Vulnerability details: VCID-5c7w-mba9-mucn
Vulnerability ID VCID-5c7w-mba9-mucn
Aliases CVE-2026-21877
GHSA-v364-rw7m-3263
Summary n8n is an open source workflow automation platform. In versions 0.121.2 and below, an authenticated attacker may be able to execute malicious code using the n8n service. This could result in full compromise and can impact both self-hosted and n8n Cloud instances. This issue is fixed in version 1.121.3. Administrators can reduce exposure by disabling the Git node and limiting access for untrusted users, but upgrading to the latest version is recommended.
Status Published
Exploitability 0.5
Weighted Severity 9.0
Risk 4.5
Affected and Fixed Packages Package Details
Weaknesses (4)
CWE-94 Improper Control of Generation of Code ('Code Injection')
CWE-434 Unrestricted Upload of File with Dangerous Type
CWE-937 OWASP Top Ten 2013 Category A9 - Using Components with Known Vulnerabilities
CWE-1035 OWASP Top Ten 2017 Category A9 - Using Components with Known Vulnerabilities
System Score Found at
epss 0.05899 https://api.first.org/data/v1/epss?cve=CVE-2026-21877
cvssv3.1_qr CRITICAL https://github.com/advisories/GHSA-v364-rw7m-3263
cvssv3.1 9.9 https://github.com/n8n-io/n8n
generic_textual CRITICAL https://github.com/n8n-io/n8n
cvssv3.1 10 https://github.com/n8n-io/n8n/commit/f4b009d00d1f4ba9359b8e8f1c071e3d910a55f6
ssvc Track https://github.com/n8n-io/n8n/commit/f4b009d00d1f4ba9359b8e8f1c071e3d910a55f6
cvssv3.1 10 https://github.com/n8n-io/n8n/security/advisories/GHSA-v364-rw7m-3263
cvssv3.1 9.9 https://github.com/n8n-io/n8n/security/advisories/GHSA-v364-rw7m-3263
cvssv3.1_qr CRITICAL https://github.com/n8n-io/n8n/security/advisories/GHSA-v364-rw7m-3263
generic_textual CRITICAL https://github.com/n8n-io/n8n/security/advisories/GHSA-v364-rw7m-3263
ssvc Track https://github.com/n8n-io/n8n/security/advisories/GHSA-v364-rw7m-3263
Reference id Reference type URL
https://api.first.org/data/v1/epss?cve=CVE-2026-21877
https://github.com/n8n-io/n8n
CVE-2026-21877 https://nvd.nist.gov/vuln/detail/CVE-2026-21877
f4b009d00d1f4ba9359b8e8f1c071e3d910a55f6 https://github.com/n8n-io/n8n/commit/f4b009d00d1f4ba9359b8e8f1c071e3d910a55f6
GHSA-v364-rw7m-3263 https://github.com/advisories/GHSA-v364-rw7m-3263
GHSA-v364-rw7m-3263 https://github.com/n8n-io/n8n/security/advisories/GHSA-v364-rw7m-3263
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H Found at https://github.com/n8n-io/n8n
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H Found at https://github.com/n8n-io/n8n/commit/f4b009d00d1f4ba9359b8e8f1c071e3d910a55f6
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: SSVCv2/E:N/A:N/T:T/P:M/B:A/M:M/D:T/2026-01-08T18:59:03Z/ Found at https://github.com/n8n-io/n8n/commit/f4b009d00d1f4ba9359b8e8f1c071e3d910a55f6
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H Found at https://github.com/n8n-io/n8n/security/advisories/GHSA-v364-rw7m-3263
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H Found at https://github.com/n8n-io/n8n/security/advisories/GHSA-v364-rw7m-3263
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: SSVCv2/E:N/A:N/T:T/P:M/B:A/M:M/D:T/2026-01-08T18:59:03Z/ Found at https://github.com/n8n-io/n8n/security/advisories/GHSA-v364-rw7m-3263
Exploit Prediction Scoring System (EPSS)
Percentile 0.90808
EPSS Score 0.05899
Published At June 11, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-06-11T16:46:58.368211+00:00 Vulnrichment Import https://github.com/cisagov/vulnrichment/blob/develop/2026/21xxx/CVE-2026-21877.json 38.6.0