> CVE-2026-21877 [CRITICAL]

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PUBLISHED
2026-01-08 01:15
MODIFIED
2026-01-08 01:15
CVSS_SCORE V3
9.9
EPSS (Prob. Exploit)
5.45%
Top 7.2%
🎯 NUCLEI TEMPLATE
DATA SOURCES:
NVD 🔗 2026-01-08 CVE PROJECT 🔗 2026-01-19 CWE MITRE 🔗 2026-11-01 FIRST EPSS 🔗 2026-11-08 GITHUB 🔗 2026-11-04 OSV 🔗 2026-11-08 NUCLEI 🔗 2026-02-06

> DESCRIPTION

n8n is an open source workflow automation platform. In versions 0.121.2 and below, an authenticated attacker may be able to execute malicious code using the n8n service. This could result in full compromise and can impact both self-hosted and n8n Cloud instances. This issue is fixed in version 1.121.3. Administrators can reduce exposure by disabling the Git node and limiting access for untrusted users, but upgrading to the latest version is recommended.

> AFFECTED_PRODUCTS

ℹ️ Aucun produit affecté n'a encore été publié par NVD pour cette CVE.

> CVSS V3 METRICS

CVSS_VECTOR
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
EXPLOITABILITY
3.1
IMPACT
6.0

> MÉTRIQUES CVSS DÉTAILLÉES

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Métrique Valeur Interprétation
AV (Vecteur d'Attaque)
Attack Vector
Network (N)
Exploit possible à distance via réseau (HTTP, API, etc.)
AC (Complexité d'Attaque)
Attack Complexity
Low (L)
Peu de conditions requises pour exploiter
PR (Privilèges Requis)
Privileges Required
Low (L)
Authentifié avec compte utilisateur basique
UI (Interaction Utilisateur)
User Interaction
None (N)
Aucune interaction utilisateur nécessaire
S (Périmètre)
Scope
Changed (C)
Impact s'étend au-delà du composant compromis
C (Impact Confidentialité)
Confidentiality Impact
High (H)
Divulgation totale d'informations
I (Impact Intégrité)
Integrity Impact
High (H)
Modification totale des données possible
A (Impact Disponibilité)
Availability Impact
High (H)
Interruption totale du service possible

> RÉSUMÉ DES IMPACTS

Confidentialité
High
Divulgation totale d'informations
Intégrité
High
Modification totale des données possible
Disponibilité
High
Interruption totale du service possible

> WEAKNESSES

CWE-94 CWE-434

> CWE DETAILED DESCRIPTIONS

CWE-94: Improper Control of Generation of Code - The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment. | CWE-434: Unrestricted Upload of File with Dangerous Type - The product allows the upload or transfer of dangerous file types that are automatically processed within its environment.

> GITHUB SECURITY ADVISORY

GHSA-v364-rw7m-3263 CRITICAL

n8n Vulnerable to RCE via Arbitrary File Write

AFFECTED PACKAGES:
NPM / n8n
>= 0.123.0, < 1.121.3
Fixed in: 1.121.3

> OSV (GOOGLE OPEN SOURCE VULNERABILITIES)

n8n is vulnerable to Remote Code Execution via Arbitrary File Write

AFFECTED PACKAGES:
Unknown / Unknown
814 versions affected
ALIASES:
GHSA-v364-rw7m-3263

> NUCLEI TEMPLATES

Des templates Nuclei sont disponibles pour scanner cette vulnérabilité.

🎯
CVE-2026-21877.yaml
http/cves/2026/CVE-2026-21877.yaml
Usage: nuclei -t http/cves/2026/CVE-2026-21877.yaml -u target.com

> HISTORIQUE DES MODIFICATIONS

Première apparition
08/01/2026 01:15
Source: NVD
📊 ENRICHISSEMENT 01/11/2026 06:58
CWE
Champ modifié: Description CWE
Ancienne valeur:
CWE-94: Improper Control of Generation of Code ('Code Injection') - The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not n...
Nouvelle valeur:
CWE-94: Improper Control of Generation of Code - The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorr...
📊 ENRICHISSEMENT 01/02/2026 06:44
CWE
Champ modifié: Description CWE
Ancienne valeur:
N/A
Nouvelle valeur:
CWE-94: Improper Control of Generation of Code ('Code Injection') - The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not n...
📊 ENRICHISSEMENT 19/01/2026 17:38
CVEPROJECT
Champ modifié: CVE Project
Ancienne valeur:
Non
Nouvelle valeur:
Oui
Total des modifications: 3 Dernière mise à jour: 1 week ago

> REFERENCES

https://github.com/n8n-io/n8n/commit/f4b009d00d1f4ba9359b8e8f1c071e3d910a55f6
https://github.com/n8n-io/n8n/security/advisories/GHSA-v364-rw7m-3263
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