EUVD-2026-31792
GHSA-47p6-69vm-vw6v
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/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:X/V:X/RE:X/U:X
Primary rating from Vendor (snyk) · only source for this CVE.
CVSS VectorVendor: snyk
Lifecycle Timeline
5Blast Radius
ecosystem impact- 57 npm packages depend on @koa/router (50 direct, 7 indirect)
Ecosystem-wide dependent count for version 14.0.0.
DescriptionCVE.org
Versions of the package @koa/router from 14.0.0 and before 15.0.0 are vulnerable to Access Control Bypass due to the middleware being silently dropped from the execution chain when the router prefix contains path parameters. Depending on what the skipped middleware was supposed to protect, an attacker could bypass authentication and authorization, evade rate limiting or bypass input sanitization.
AnalysisAI
Access control bypass in @koa/router versions 14.0.0 to before 15.0.0 allows attackers to skip middleware execution when the router prefix contains path parameters. This can lead to authentication and authorization bypass, rate limit evasion, or input sanitization circumvention. A public proof-of-concept is available, but no active exploitation has been reported (EPSS 0.09%).
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Same weakness CWE-284 – Improper Access Control
View allSame technique Authentication Bypass
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External POC / Exploit Code
Leaving vuln.today