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CVE-2026-81664— OpenFaaS Gateway 0.27.11 through 0.27.13 Missing Authentication on the /system/telemetry Route

Quick assessment

Affected
openfaas faas
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

OpenFaaS 网关在 中注册了 路由。当启用 时，每个管理接口 的处理函数会被 包装以进行身份验证。然而，自引入该路由的版本 0.27.11 起， 并未包含在该包装块中，直到 0.27.14 才将其加入。因此，在受影响的网关版本中， 路由在未进行任何凭据检查的情况下直接到达转发代理，并返回已配置提供商对 所服务的内容。这意味着，任何能够访问网关端口的客户端，无论 设置如何，都可以读取提供商的遥测数据。具体暴露的内容取决于所使用的提供商：对于 ，涵盖资源指标和调用统计；对于 ，则涵盖 Pod 或集群状态信息。

CVSS 5.3 · Medium
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I. Basic Information for CVE-2026-81664

Vulnerability Information
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Vulnerability Title
OpenFaaS Gateway 0.27.11 through 0.27.13 Missing Authentication on the /system/telemetry Route
Source: CVE Program / CVE List V5
Vulnerability Description
The OpenFaaS gateway registers GET /system/telemetry in gateway/main.go and, when basic_auth is enabled, wraps each administrative /system/* handler in auth.DecorateWithBasicAuth. TelemetryHandler was left out of that wrap block from 0.27.11, which introduced the route, until 0.27.14, which added it. On an affected gateway the route therefore reaches the forwarding proxy with no credential check and returns whatever the configured provider serves for /system/telemetry, so any client that can reach the gateway port can read the provider's telemetry regardless of the basic_auth setting. The exposed content depends on the provider, and covers resource and invocation metrics for faasd and pod or cluster state for faas-netes.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
关键功能的认证机制缺失
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
openfaas faas 0.27.11 ~ 0.27.14 -

II. Public POCs for CVE-2026-81664

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III. Intelligence Information for CVE-2026-81664

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Patches & Fixes for CVE-2026-81664 (1)

Vendor Advisories for CVE-2026-81664 (1)

Proof of Concept for CVE-2026-81664 (3)

IV. Related Vulnerabilities

Same weakness: CWE-306

V. Comments for CVE-2026-81664

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