CVE-2026-54665Network attack vector

URL manipulation via unvalidated proxy host headers

Published Jun 22, 2026 · Updated Jun 22, 2026

Host header injection in Apache NiFi 0.0.1 through 2.9.0 allows remote attackers to alter qualified URLs via proxy headers. NiFi web services trust X-ProxyHost or X-Forwarded-Host without checking nifi.web.proxy.host, then use the supplied host in redirects and data-reference URLs. The request must reach NiFi without a reverse proxy filtering untrusted headers; the result is URL integrity loss, not server code execution.

CVSS severity6.3
Medium
EPSS probability0.33%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Host header injection in Apache NiFi 0.0.1 through 2.9.0 allows remote attackers to alter qualified URLs via proxy headers. NiFi web services trust X-ProxyHost or X-Forwarded-Host without checking nifi.web.proxy.host, then use the supplied host in redirects and data-reference URLs. The request must reach NiFi without a reverse proxy filtering untrusted headers; the result is URL integrity loss, not server code execution.

The record

CVE
CVE-2026-54665
Published
Jun 22, 2026
Updated
Jun 22, 2026
Vendor
The Apache Software Foundation
Product
Apache NiFi
Classifications
CWE-346, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 22, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 22, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0.0.1 <2.10.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Apache Software Foundation · Apache NiFiversion=0.0.1 <2.10.0

Published CVSS scores

5.3NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
6.3Apache Software FoundationCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-346Origin Validation Error
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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