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CVE-2026-21858 (GCVE-0-2026-21858)

Vulnerability from cvelistv5 – Published: 2026-01-07 23:57 – Updated: 2026-01-12 18:37
VLAI Shadowserver Previdian
Title
n8n Vulnerable to Unauthenticated File Access via Improper Webhook Request Handling
Summary
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.
Severity
10 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N
SSVC
Exploitation: none Automatable: yes Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-01-08 19:09 UTC
CWE
  • CWE-20 - Improper Input Validation
Assigner
References
Impacted products
Vendor Product Version CPE status
n8n-io n8n Affected: >= 1.65.0, < 1.121.0
guessed Create a notification for this product.
Shadowserver
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 1a581b3a-8460-4d4c-93ce-db446e30051b

Vulnerability ID: CVE-2026-21858

Status: Confirmed

Status Updated: 2026-07-20 00:00 UTC

Exploited: Yes

Characteristics
Severity: 100.0
Timestamps
First Seen: 2026-01-27
Asserted: 2026-01-27
Last Seen: 2026-07-20
Scope
Asset Exposure: ['internet-facing']
Notes: Affected: n8n / n8n | Class: other-software | Severity: Critical (CVSS 10) | IoT: no | In CISA KEV: no | Honeypot connections on 2026-07-20: 53
Evidence

Type: Honeypot

Signal: In The Wild Attempts

Confidence: 70%

Source: shadowserver

Details
1D 1
Iot no
Feed Shadowserver Foundation honeypot/exploited-vulnerabilities
Type http-scan
Class other-software
7D Avg 1
Vendor n8n
30D Avg 1
90D Avg 0
Product n8n
Cisa Kev no
Connections 53
Observation Date 2026-07-20
Vulnerability Class CVSS
Vulnerability Score 10
Vulnerability Severity Critical
References
Created: 2026-06-30 09:23 UTC | Updated: 2026-07-22 01:00 UTC
Previdian
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: af96860d-c819-4f08-b6d8-0e0f28763ce1

Vulnerability ID: CVE-2026-21858

Status: Confirmed

Status Updated: 2026-02-07 00:00 UTC

Exploited: Yes

Timestamps
First Seen: 2026-02-07
Asserted: 2026-02-07
Scope
Notes: KEVIntel entry: n8n Vulnerable to Unauthenticated File Access via Improper Webhook Request Handling | Affected: n8n-io / n8n | CVSS: 10.0 (CRITICAL) | Used in malware: unknown | Not yet in CISA KEV: True
Evidence

Type: Public Report

Signal: Successful Exploitation

Confidence: 70%

Source: kevintel

Details
Feed KEVIntel (kevintel.com)
Title n8n Vulnerable to Unauthenticated File Access via Improper Webhook Request Handling
Vendor n8n-io
Product n8n
Added Date 2026-02-07T00:00:00.000Z
Cvss Score 10.0
Epss Score None
Cvss Severity CRITICAL
Epss Percentile None
Used In Malware unknown
Ahead Of Cisa Kev None
Not Yet In Cisa Kev True
References
Created: 2026-06-23 14:03 UTC | Updated: 2026-07-10 06:14 UTC
Show details on NVD website
To clipboard 

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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.