GHSA-v4pr-fm98-w9pg · Severity: critical · Ecosystem: npm — n8n Vulnerable to Unauthenticated File Access via Improper Webhook Request Handling
n8n is an open source workflow automation platform. Versions starting with 1.65.0 and below 1.121.0 enable an attacker to access files on the underlying server through execution of certain form-based workflows. A vulnerable workflow could grant access to an unauthenticated remote attacker, resulting in exposure of sensitive information stored on the system and may enable further compromise depending on deployment configuration and workflow usage. This issue is fixed in version 1.121.0.
Conclusion & alert: CVE-2026-21858 is rated High Exploit Risk (85.7/100): CVSS Critical severity, with high exploitation likelihood (EPSS 5.90%, 91th percentile). Core evidence: 1 public exploit reference(s) are indexed (Exploit-DB). Mandatory action: Public exploits are available—assess exposure, apply mitigations, and prioritize patching.
Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.
| EDB-ID | Source | Kind | Published | Link |
|---|---|---|---|---|
| — | nvd_ref | exploit_tag | Exploit-DB ↗ |
EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).
| # | Date | Old EPSS score | New EPSS score | Delta (New - Old) |
|---|---|---|---|---|
| 1 | 2026-06-05 | 6.94% | 5.90% | -1.04% |
| 2 | 2026-05-18 | 5.69% | 6.94% | +1.25% |
| 3 | 2026-05-09 | — | 5.69% | — |
Full EPSS history (27 records total)
CVSS metrics for this CVE.
| Base score | Version | Severity | Vector | Exploitability | Impact | Score source |
|---|---|---|---|---|---|---|
| 10.0 | 3.1 | CRITICAL |
|
3.9 | 5.8 | [email protected] |
GHSA-v4pr-fm98-w9pg · Severity: critical · Ecosystem: npm — n8n Vulnerable to Unauthenticated File Access via Improper Webhook Request Handling
| URL | Tags |
|---|---|
| https://github.com/n8n-io/n8n/security/advisories/GHSA-v4pr-fm98-w9pg | Vendor Advisory |
| https://www.cyera.com/research-labs/ni8mare-unauthenticated-remote-code-execution-in-n8n-cve-2026-21858 | Exploit Third Party Advisory |