# CVE-2026-126383: n8n before 1.123.89 NoSQL Injection via MongoDB Node Update Key

Status: published. Published: 2026-11-13. Updated: 2026-11-13.

n8n before 1.123.89, 2.x before 2.45.5, 2.46.x before 2.46.1, and 3.x before 3.0.1 contains a NoSQL injection vulnerability in the MongoDB node's Update and Find And Replace operations due to insufficient validation of the update key value taken from incoming items. Attackers who can supply untrusted input, such as a webhook body, to a workflow using these operations can make the node match and overwrite unintended documents or insert new documents in the MongoDB database.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- n8n-io / n8n (n8n): ≥ 0; < 1.123.89 (affected, semver); 1.123.89 (unaffected, semver). Source: CNA: VulnCheck
- n8n-io / n8n (n8n): ≥ 2.46.0; < 2.46.1 (affected, semver); 2.46.1 (unaffected, semver). Source: CNA: VulnCheck
- n8n-io / n8n (n8n): ≥ 2.0.0; < 2.45.5 (affected, semver); 2.45.5 (unaffected, semver). Source: CNA: VulnCheck
- n8n-io / n8n (n8n): ≥ 3.0.0; < 3.0.1 (affected, semver); 3.0.1 (unaffected, semver). Source: CNA: VulnCheck

## Severity and prioritization

- CVSS 4.0: 5.3 (medium); CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:N/SC:N/SI:H/SA:H; source: CNA: VulnCheck

- CVSS 3.1: 8.2 (high); CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:H/A:H; source: CNA: VulnCheck

- CVSS 4.0: 5.3 (medium); CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:N/SC:N/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X; source: NVD: disclosure@vulncheck.com

- CVSS 3.1: 8.2 (high); CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:H/A:H; source: NVD: disclosure@vulncheck.com

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- Weaknesses: CWE-943

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://github.com/n8n-io/n8n/security/advisories/GHSA-4v22-g448-h4rg (CNA: VulnCheck; vendor-advisory)

- https://www.vulncheck.com/advisories/n8n-before-1.123.89-nosql-injection-via-mongodb-node-update-key (CNA: VulnCheck; third-party-advisory)

- https://github.com/n8n-io/n8n/security/advisories/GHSA-4v22-g448-h4rg (disclosure@vulncheck.com)

- https://www.vulncheck.com/advisories/n8n-before-1.123.89-nosql-injection-via-mongodb-node-update-key (disclosure@vulncheck.com)

## Provenance

- CNA: VulnCheck: https://www.cve.org/CVERecord?id=CVE-2026-126383; retrieved 2026-11-13; source updated 2026-11-13

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-126383; retrieved 2026-11-13; source updated 2026-11-13

Revision: b97584e6e66380765b93e3c7352e7dc231b1a643ed80cf2f06f80c58ae26cac2

Canonical: https://y2.dev/cve/CVE-2026-126383

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