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CVE-2026-54665— Apache NiFi: Missing Validation for Proxy Host Headers

Quick assessment

Affected
Apache Software Foundation Apache NiFi
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Apache nifi是美国Apache基金会开源的一款数据流处理系统。 Apache NiFi 0.0.1至2.10.0版本存在输入验证错误漏洞，该漏洞源于未验证HTTP请求标头中的值，允许客户端构造无效的合格URL用于重定向或数据引用。

AI Predicted 6.5 Difficulty: Easy EPSS 0.33% · P23

Affected Version Matrix 1

VendorProduct Version RangeStatus
Apache Software Foundation Apache NiFi 0.0.1< 2.10.0 affected
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I. Basic Information for CVE-2026-54665

Vulnerability Information
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Vulnerability Title
Apache NiFi: Missing Validation for Proxy Host Headers
Source: CVE Program / CVE List V5
Vulnerability Description
Apache NiFi 0.0.1 through 2.9.0 support building qualified URLs from one of several HTTP request headers that provide an alternative to the standard Host header without validating the values provided. Apache NiFi 1.6.0 introduced a configurable application property to restrict values provided in the HTTP Host header, but did not apply the validation to alternative Proxy and Forwarded headers. The absence of proxy host header validation allowed a client to instruct Apache NiFi web services to construct invalid qualified URLs for redirection or data references. Upgrading to Apache NiFi 2.10.0 is the recommended mitigation, which implements validation for the X-ProxyHost and X-Forwarded-Host HTTP request headers based on the nifi.web.proxy.host property. Enabling header validation requires configuring the application with HTTPS. Reverse proxy servers in front of Apache NiFi are responsible for filtering input request headers and providing allowed values to the application.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N/S:N/AU:Y/R:A/V:D/RE:L/U:Green
Source: CVE Program / CVE List V5
Vulnerability Type
源验证错误
Source: CVE Program / CVE List V5
Vulnerability Title
Apache NiFi 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Apache nifi是美国Apache基金会开源的一款数据流处理系统。 Apache NiFi 0.0.1至2.10.0版本存在输入验证错误漏洞，该漏洞源于未验证HTTP请求标头中的值，允许客户端构造无效的合格URL用于重定向或数据引用。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Apache Software Foundation Apache NiFi 0.0.1 ~ 2.10.0 -

II. Public POCs for CVE-2026-54665

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III. Intelligence Information for CVE-2026-54665

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Mailing List Discussions for CVE-2026-54665 (1)

Same Patch Batch · Apache Software Foundation · 2026-06-22 · 6 CVEs total

CVE-2025-62198 Apache Atlas: Stored XSS in Create Entity page
CVE-2026-44914 Apache NiFi: Missing Authorization of Restricted Permissions when Replacing Flow Contents
CVE-2026-44911 Apache NiFi: Incorrect Authorization for Configuration Verification Requests
CVE-2026-44913 Apache NiFi: Improper Escaping of Table Names in CaptureChangeMySQL
CVE-2025-66336 Apache Doris MCP Server: SQL injection leading the authentication bypass

IV. Related Vulnerabilities

Same product: Apache NiFi
Same vendor: Apache Software Foundation
Same weakness: CWE-346

V. Comments for CVE-2026-54665

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