CVE-2026-81664Network attack vectorHinoki check available

Telemetry disclosure via omitted authentication decorator

Published Aug 27, 2026 · Updated Aug 27, 2026

Missing authentication in OpenFaaS Gateway 0.27.11 through 0.27.13 allows remote attackers to read provider telemetry over HTTP. gateway/main.go registers GET /system/telemetry but omits TelemetryHandler from the basic-authentication decorator applied to other administrative routes, forwarding unauthenticated requests to the provider. Any client able to reach the gateway port can obtain resource and invocation metrics from faasd or pod and cluster state from faas-netes, without reported write access or service interruption.

CVSS severity6.9
Medium
EPSS probability0.29%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Missing authentication in OpenFaaS Gateway 0.27.11 through 0.27.13 allows remote attackers to read provider telemetry over HTTP. gateway/main.go registers GET /system/telemetry but omits TelemetryHandler from the basic-authentication decorator applied to other administrative routes, forwarding unauthenticated requests to the provider. Any client able to reach the gateway port can obtain resource and invocation metrics from faasd or pod and cluster state from faas-netes, without reported write access or service interruption.

The record

CVE
CVE-2026-81664
Published
Aug 27, 2026
Updated
Aug 27, 2026
Vendor
OpenFaaS Ltd
Product
OpenFaaS
Classifications
CWE-306, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 27, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 27, 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=0.27.11 <0.27.14

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

OpenFaaS Ltd · OpenFaaSversion=0.27.11 <0.27.14

Published CVSS scores

5.3VulnCheck CNACVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
6.9VulnCheck CNACVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/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-306Missing Authentication for Critical Function
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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