CVE-2026-21858

n8n Vulnerable to Unauthenticated File Access via Improper Webhook Request Handling

CRITICAL 10.0EPSS 78.2%

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.

Affected: n8n-io · n8n
CVSS v3.1 GITHUB: 10.0 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N
EPSS: 78.19% chance of exploitation in the next 30 days, 100th percentile
Nuclei: critical · CWE-20
Published: 2026-01-07
Updated: 2026-01-12

Proof-of-concept exploits (19)

Chocapikk/CVE-2026-21858304★ · 2026-03-26
sh4den/CVE-2026-218583★ · 2026-07-06
bgarz929/Ashwesker-CVE-2026-218580★ · 2026-01-07
sec-dojo-com/CVE-2026-218581★ · 2026-01-20
0xBlackash/CVE-2026-218581★ · 2026-03-05
EQSTLab/CVE-2026-218581★ · 2026-05-20
Alhakim88/CVE-2026-218580★ · 2026-01-30
Yati2/Ni8mare-CVE-2026-218580★ · 2026-03-13
kaleth4/CVE-2026-218580★ · 2026-04-09
masterwok/PoC-CVE-2026-218580★ · 2026-04-16
Bannt08/Research-CVE-2026-218580★ · 2026-05-08
Fomovet/cve-2026-218581★ · 2026-06-21
qianlijaingshan/n8n-cve-2026-218580★ · 2026-07-21
Giangdurian/CVE-2026-21858-and-CVE-2025-686130★ · 2026-08-02
xitexploiter96-dot/exploit-218581★ · 2026-01-09
RBKD-SEC/POC0★ · 2026-08-31
galois17/n8n-ni8mare-educational0★ · 2026-01-15
ZeroDayEvil/CVE-2026-21858-n8n-FullChain88★ · 2026-09-12
yym8538/CVE-2026-218581★ · 2026-08-21

CVE-2026-21858

Proof-of-concept exploits (19)

Nuclei templates (1)

Vulhub environments (1)

Exploit collections (1)

Security advisories

References

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