CVE-2026-54665

MEDIUMNVD 5.35.3—
EchelonGraph scoreHIGH confidence

Score 5.3 from GitHub Security Advisory published 2026-06-22. NVD baseline CVSS 5.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 3 sources updated this week
5.3
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 5.3Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
5.3
EG Score
5.3(high)
EPSS
18.4%
KEV
Not listed

Published

June 22, 2026

Last Modified

June 23, 2026

Advisory Details (2)

Auto-updated Jun 22, 2026
No patch confirmed yet.
generic

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

http://www.openwall.com/lists/oss-security/2026/06/20/7
generic
https://lists.apache.org/thread/y0yoblon8f6dp00qz5r90cxq5n6g4j6k

Vendor Advisories for CVE-2026-54665(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 24× in last 7d / 52× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-06 21:34 UTCEG score recompute
  2. 2026-07-06 21:34 UTCGHSA enrichment
  3. 2026-07-06 16:27 UTCEPSS rescore
  4. 2026-07-06 16:27 UTCEPSS rescore
  5. 2026-07-06 02:23 UTCEPSS rescore
  6. 2026-07-06 02:23 UTCEPSS rescore
  7. 2026-07-05 19:27 UTCEG score recompute
  8. 2026-07-05 19:27 UTCGHSA enrichment
  9. 2026-07-05 02:31 UTCEPSS rescore
  10. 2026-07-05 02:30 UTCEPSS rescore
  11. 2026-07-04 17:20 UTCEG score recompute
  12. 2026-07-04 17:20 UTCGHSA enrichment
  13. 2026-07-04 06:31 UTCEPSS rescore
  14. 2026-07-04 06:31 UTCEPSS rescore
  15. 2026-07-03 15:13 UTCEG score recompute
  16. 2026-07-03 15:13 UTCGHSA enrichment
  17. 2026-07-02 13:05 UTCEG score recompute
  18. 2026-07-02 13:05 UTCGHSA enrichment
  19. 2026-07-01 15:07 UTCEPSS rescore
  20. 2026-07-01 10:57 UTCEG score recompute
  21. 2026-07-01 10:57 UTCGHSA enrichment
  22. 2026-06-30 23:22 UTCEPSS rescore
  23. 2026-06-30 08:49 UTCEG score recompute
  24. 2026-06-30 08:49 UTCGHSA enrichment
  25. 2026-06-29 14:06 UTCEPSS rescore
Show 27 more
  1. 2026-06-29 14:06 UTCEPSS rescore
  2. 2026-06-29 06:42 UTCEG score recompute
  3. 2026-06-29 06:42 UTCGHSA enrichment
  4. 2026-06-28 14:07 UTCEPSS rescore
  5. 2026-06-28 04:56 UTCEPSS rescore
  6. 2026-06-28 04:56 UTCEPSS rescore
  7. 2026-06-28 04:33 UTCEG score recompute
  8. 2026-06-28 04:32 UTCGHSA enrichment
  9. 2026-06-27 03:08 UTCEPSS rescore
  10. 2026-06-27 02:25 UTCEG score recompute
  11. 2026-06-27 02:25 UTCGHSA enrichment
  12. 2026-06-26 00:18 UTCEG score recompute
  13. 2026-06-26 00:17 UTCGHSA enrichment
  14. 2026-06-25 13:49 UTCEPSS rescore
  15. 2026-06-24 22:05 UTCEG score recompute
  16. 2026-06-24 22:05 UTCGHSA enrichment
  17. 2026-06-24 14:05 UTCEPSS rescore
  18. 2026-06-23 21:33 UTCEPSS rescore
  19. 2026-06-23 21:33 UTCEPSS rescore
  20. 2026-06-23 19:57 UTCEG score recompute▼ 1.00
  21. 2026-06-23 19:57 UTCGHSA enrichment
  22. 2026-06-23 19:32 UTCNVD updateCVSS v3 → 5.3
  23. 2026-06-22 17:50 UTCEG score recompute▲ 6.30
  24. 2026-06-22 17:50 UTCGHSA enrichment
  25. 2026-06-22 17:45 UTCNVD updateCVSS v3 → 6.3 · CVSS v4 → 6.3
  26. 2026-06-22 10:04 UTCEG score recompute
  27. 2026-06-22 10:04 UTCGHSA enrichment

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-54665?
CVE-2026-54665 is a medium vulnerability published on June 22, 2026. 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…
When was CVE-2026-54665 disclosed?
CVE-2026-54665 was first published in the National Vulnerability Database on June 22, 2026, with the most recent update on June 23, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-54665 actively exploited?
CVE-2026-54665 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 18.4% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-54665?
CVE-2026-54665 has a CVSS v3 base score of 5.3 (NVD).
How do I remediate CVE-2026-54665?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-54665, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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