CVE-2026-21858— n8n 输入验证错误漏洞
一分钟漏洞结论
影响对象
n8n-io n8n
利用判断
存在公开或 AI PoC，应优先验证
建议动作
优先检查厂商安全公告和参考链接中的修复版本；无法立即升级时，限制受影响服务暴露并加强监测。
n8n是n8n开源的一个可扩展的工作流自动化工具。 n8n 1.121.0之前版本存在输入验证错误漏洞，该漏洞源于攻击者可通过执行基于表单的工作流访问底层服务器文件，可能导致敏感信息泄露。
公开利用映射 1
Nuclei · 1
CVE-2026-21858.yaml [template]
已观察到在野利用
github_trending · medium
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一、 漏洞 CVE-2026-21858 基础信息
漏洞信息
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Vulnerability Title
n8n Vulnerable to Unauthenticated File Access via Improper Webhook Request Handling
来源: CVE Program / CVE List V5
Vulnerability 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.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N
来源: CVE Program / CVE List V5
Vulnerability Type
输入验证不恰当
来源: CVE Program / CVE List V5
Vulnerability Title
n8n 输入验证错误漏洞
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Description
n8n是n8n开源的一个可扩展的工作流自动化工具。 n8n 1.121.0之前版本存在输入验证错误漏洞，该漏洞源于攻击者可通过执行基于表单的工作流访问底层服务器文件，可能导致敏感信息泄露。
来源: 中国国家信息安全漏洞库 CNNVD
CVSS Information
N/A
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Type
N/A
来源: 中国国家信息安全漏洞库 CNNVD
受影响产品
二、漏洞 CVE-2026-21858 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|---|---|---|
| 1 | 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. | https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-21858.yaml | POC详情 |
| 2 | A maximum severity vulnerability dubbed "Ni8mare" allows remote, unauthenticated attackers to take control over locally deployed instances of the N8N workflow automation platform. | https://github.com/eduardorossi84/CVE-2026-21858-POC | POC详情 |
| 3 | n8n Ni8mare - Unauthenticated Arbitrary File Read to RCE Chain (CVSS 10.0) | https://github.com/Chocapikk/CVE-2026-21858 | POC详情 |
| 4 | CVE-2026-21858 | https://github.com/Ashwesker/Ashwesker-CVE-2026-21858 | POC详情 |
| 5 | Comprehensive vulnerability detection tool for n8n workflow automation instances. Detects the critical CVE-2026-21858 vulnerability (CVSS 10.0) without performing any exploitation. | https://github.com/cropnet/ni8mare-scanner | POC详情 |
| 6 | SASTRA-ADI-WIGUNA-CVE-2026-21858-Holistic-Audit | https://github.com/sastraadiwiguna-purpleeliteteaming/SASTRA-ADI-WIGUNA-CVE-2026-21858-Holistic-Audit | POC详情 |
| 7 | Comprehensive vulnerability detection tool for n8n workflow automation instances. Detects the critical CVE-2026-21858 vulnerability (CVSS 10.0) without performing any exploitation. | https://github.com/cropnet/Ni8mare | POC详情 |
| 8 | None | https://github.com/sec-dojo-com/CVE-2026-21858 | POC详情 |
| 9 | Proof of Concept: CVE-2026-21858 is vulnerability on n8n where unauthenticated remote attackers can access sensitive files. | https://github.com/SystemVll/CVE-2026-21858 | POC详情 |
| 10 | CVE-2026-21858 | https://github.com/bgarz929/Ashwesker-CVE-2026-21858 | POC详情 |
| 11 | Hack | https://github.com/Alhakim88/CVE-2026-21858 | POC详情 |
| 12 | None | https://github.com/EQSTLab/CVE-2026-21858 | POC详情 |
| 13 | CVE-2026-21858 | https://github.com/zaryouhashraf/CVE-2026-21858 | POC详情 |
| 14 | None | https://github.com/bamov970/CVE-2026-21858 | POC详情 |
| 15 | https://github.com/vulhub/vulhub/blob/master/n8n/CVE-2026-21858/README.md | POC详情 | |
| 16 | None | https://github.com/Threekiii/Awesome-POC/blob/master/Web%E5%BA%94%E7%94%A8%E6%BC%8F%E6%B4%9E/n8n%20Content-Type%20%E6%B7%B7%E6%B7%86%E4%BB%BB%E6%84%8F%E6%96%87%E4%BB%B6%E8%AF%BB%E5%8F%96%E8%87%B3%20RCE%20%E6%BC%8F%E6%B4%9E%20CVE-2026-21858.md | POC详情 |
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CVE-2026-21858 厂商安全公告 (1)
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https://github.com/n8n-io/n8n/security/advisories/GHSA-v4pr-fm98-w9pg x_refsource_CONFIRM
IV. Related Vulnerabilities
V. Comments for CVE-2026-21858
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