# CVE-2026-118648: n8n before 1.123.85, 2.43.5, and 2.44.1 Stored XSS via Webhook Responses Missing Sandbox Policy

Status: published. Published: 2026-10-28. Updated: 2026-11-03.

n8n before 1.123.85, 2.x before 2.43.5, and 2.44.x before 2.44.1 contains a stored cross-site scripting vulnerability because some webhook response paths, such as error responses and responses without headers, omit the sandbox Content-Security-Policy. Authenticated members who can create and activate workflows can serve HTML that runs on the n8n origin, letting scripts act with the session of users who open the webhook URL.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- n8n-io / n8n (n8n): ≥ 0; < 1.123.85 (affected, semver); 1.123.85 (unaffected, semver). Source: CNA: VulnCheck
- n8n-io / n8n (n8n): ≥ 2.44.0; < 2.44.1 (affected, semver); 2.44.1 (unaffected, semver). Source: CNA: VulnCheck
- n8n-io / n8n (n8n): ≥ 2.0.0; < 2.43.5 (affected, semver); 2.43.5 (unaffected, semver). Source: CNA: VulnCheck

## Severity and prioritization

- CVSS 4.0: 8.4 (high); CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:H/VI:H/VA:N/SC:L/SI:L/SA:N; source: CNA: VulnCheck

- CVSS 3.1: 7.3 (high); CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N; source: CNA: VulnCheck

- CISA KEV: No listing in collected sources

- EPSS: 0.26% as of 2026-11-02; percentile 17.61%

- SSVC: exploitation none; automatable no; technical impact total; source ADP: CISA-ADP

- Weaknesses: CWE-79

## 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-mp7q-23hg-35cf (CNA: VulnCheck; vendor-advisory)

- https://www.vulncheck.com/advisories/n8n-before-1.123.85-2.43.5-and-2.44.1-stored-xss-via-webhook-responses-missing-sandbox-policy (CNA: VulnCheck; third-party-advisory)

## Provenance

- CNA: VulnCheck: https://www.cve.org/CVERecord?id=CVE-2026-118648; retrieved 2026-11-03; source updated 2026-11-03

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-118648; retrieved 2026-11-03; source updated Not reported

Revision: 53aa22e4820c8e3afd74c7e07cc4efe555b2dda6853e99fabea2955c4fb1f0c9

Canonical: https://y2.dev/cve/CVE-2026-118648

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