CVE-2026-40910Public exploitNetwork attack vector

Authentication bypass via mismatched HTTP credential sources

Published Apr 21, 2026 · Updated Apr 21, 2026

Authentication bypass in frp 0.43.0 through 0.68.0 allows remote attackers to access protected HTTP backends via proxy requests. In pkg/util/vhost/http.go, injectRequestInfoToCtx routes on Proxy-Authorization while ServeHTTP validates the unrelated Authorization header. Exploitation requires a reachable HTTP vhost, enabled routeByHTTPUser with httpUser and httpPassword, and a known or guessed route value.

CVSS severity6.5
Medium
EPSS probability0.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in frp 0.43.0 through 0.68.0 allows remote attackers to access protected HTTP backends via proxy requests. In pkg/util/vhost/http.go, injectRequestInfoToCtx routes on Proxy-Authorization while ServeHTTP validates the unrelated Authorization header. Exploitation requires a reachable HTTP vhost, enabled routeByHTTPUser with httpUser and httpPassword, and a known or guessed route value.

The record

CVE
CVE-2026-40910
Published
Apr 21, 2026
Updated
Apr 21, 2026
Vendor
fatedier
Product
frp
Classifications
CWE-287, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 21, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 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=< 0.68.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

fatedier · frpversion=< 0.68.1

Published CVSS scores

9.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
6.5GitHub, Inc.CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/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.

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

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 exploitPublished

Weakness, pattern, technique

CWE-287Improper Authentication
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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