CVE-2026-21858
CriticalExploitedn8n Vulnerable to Unauthenticated File Access via Improper Webhook Request Handling
Published Jan 7, 2026 · Updated Aug 12, 2026 · Also known as GHSA-v4pr-fm98-w9pg
Key Facts
Patch immediately- CVE-2026-21858 is a critical-severity vulnerability (CVSS 10.0 v3.1) affecting N8n.
- It is exploited in the wild, listed in Industry KEV feed, CIRCL KEV since Jan 9, 2026. No public exploit code is known.
- EPSS estimates a 78% probability of exploitation in the next 30 days.
- Fixed versions are available, including N8n 1.121.0.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v3.1
10.0
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N
EPSS (30-day exploit likelihood)
78%
Higher than 99.5% of all scored CVEs
Exploited in the wild
Yes
2 catalog listings
Public exploit code
None known
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Description
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.
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| Industry KEV feed | Jan 9, 2026 | n/a | Not reported |
| CIRCL KEV | Jan 27, 2026 | n/a | Not reported |
Required action: Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.
Affected Products
3 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| N8nN8n | >= 1.65.0, >= >= 1.65.0, < 1.121.0 | 1.121.0 |
Patched Releases
N8n
1.121.0
Timeline
Publicly disclosed
Jan 7, 2026
Added to Industry KEV feed
Jan 9, 2026
Added to CIRCL KEV
Jan 27, 2026
Last updated
Aug 12, 2026
Weakness Type
- CWE-20 Improper Input Validation
References
- advisoryGHSA advisory
- advisoryhttps://github.com/CVEProject/cvelistV5/tree/main/cves/2026/21xxx/CVE-2026-21858.json
- advisoryhttps://nvd.nist.gov/vuln/detail/CVE-2026-21858
- exploitVulnCheck exploitation report
- exploitVulnCheck exploitation report
FAQ
Common Questions.
n8n is an open source workflow automation platform.
Affected: N8n versions >= 1.65.0, >= >= 1.65.0, < 1.121.0. The full list is in the CVE brief.
It is exploited in the wild, listed in Industry KEV feed, CIRCL KEV since Jan 9, 2026.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
No public exploit code is known.
Fixed versions are available, including N8n 1.121.0.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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