CVE-2026-62987Public exploitNetwork attack vectorHinoki check available

Access-control bypass via strippable trust headers

Published Sep 21, 2026 · Updated Sep 21, 2026

Header spoofing in Fabiolb Fabio 1.6.6 through 1.7.1 allows remote attackers to strip configured trust headers via HTTP requests. HTTPProxy.ServeHTTP sets operator-named headers before Go ReverseProxy deletes every header named by the inbound Connection field. Exposure requires a nonempty client-IP, TLS, or request-ID header option and can corrupt authorization or audit signals consumed by the backend.

CVSS severity5.8
Medium
EPSS probability0.20%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Header spoofing in Fabiolb Fabio 1.6.6 through 1.7.1 allows remote attackers to strip configured trust headers via HTTP requests. HTTPProxy.ServeHTTP sets operator-named headers before Go ReverseProxy deletes every header named by the inbound Connection field. Exposure requires a nonempty client-IP, TLS, or request-ID header option and can corrupt authorization or audit signals consumed by the backend.

The record

CVE
CVE-2026-62987
Published
Sep 21, 2026
Updated
Sep 21, 2026
Vendor
Fabiolb
Product
Fabio
Classifications
CWE-348, CWE-290, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 21, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 21, 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=>= 1.6.6, < 1.7.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Fabiolb · Fabioversion=>= 1.6.6, < 1.7.2

Published CVSS scores

5.8GitHubCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A: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.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-348Use of Less Trusted Source
CWE-290Authentication Bypass by Spoofing
T1190Exploit Public-Facing Application

Public exploit references

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Technologies

Your stack

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Your stack

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