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Vulnerability record · CVE-2026-9317 · published 4 September 2026

CVE-2026-9317: Missing authentication for critical function vulnerability

Nango before 0.71.6 contains a missing authentication vulnerability in the runner tRPC server that allows unauthenticated attackers to execute arbitrary JavaScript code by invoking the exposed start procedure without credentials. Attackers with network access to the runner port can send requests to the unauthenticated start procedure, bypassing the unenforced RUNNER_SECRET_KEY environment variable, to achieve remote code execution within the runner process.

9.2 CVSS 4.0 Critical EPSS 1.3% · top 31.5% CWE-306 · Missing authentication for critical function Deferred
9.2CVSS 4.0 base score
1.3%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
4References
23 Sep 2026Last modified by NVD

Description

Nango before 0.71.6 contains a missing authentication vulnerability in the runner tRPC server that allows unauthenticated attackers to execute arbitrary JavaScript code by invoking the exposed start procedure without credentials. Attackers with network access to the runner port can send requests to the unauthenticated start procedure, bypassing the unenforced RUNNER_SECRET_KEY environment variable, to achieve remote code execution within the runner process.

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

LinkTags
https://github.com/NangoHQ/nango/commit/ed3030a9a0f8e4f3810fd10cb3a1905a2f5f87d2
https://github.com/NangoHQ/nango/pull/7288
https://github.com/NangoHQ/nango/releases/tag/v0.71.6
https://www.vulncheck.com/advisories/nango-missing-authentication-rce-via-runner-trpc-server

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Source: NIST National Vulnerability Database (record CVE-2026-9317), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.