CVE-2026-73553

7.5 HIGHpublic exploit available

Published 2026-09-21 · Updated 2026-09-21

AI risk analysis

Summary: This flaw in Envoy allows unauthenticated clients to bypass path-based authorization by manipulating URL parameters, potentially gaining unauthorized access to protected routes.
Exploitability: Exploitation requires enabling specific route options and matching conditions; however, once present, the vulnerability is relatively easy to exploit.
Blast radius: If exploited, this could lead to significant security breaches, including unauthorized access to sensitive services or data.
Prioritized remediation: Update Envoy to version 1.36.10, 1.37.6, 1.38.4, or 1.39.1 to address the vulnerability.

auth-bypassrbacproxyweb

Analysis generated locally by qwen2.5:7b-instruct (no data left the box). AI-assisted — verify against primary sources before acting.

NVD description

Envoy is an open source edge and service proxy designed for cloud-native applications. Prior to 1.36.10, 1.37.6, 1.38.4, and 1.39.1, When ignore_path_parameters_in_path_matching is enabled, Envoy's router strips the semicolon suffix before matching but the RBAC url_path matcher evaluates the raw path. A downstream request such as /admin;x can therefore miss a DENY rule for /admin while the router still selects the protected /admin backend. The inconsistent canonicalization allows an unauthenticated client to bypass path-based authorization. The relevant scope boundary is that the route option and a path-based RBAC rule must both be present, and the protected route must match after stripping. This issue is fixed in versions 1.36.10, 1.37.6, 1.38.4, and 1.39.1.

CVSS vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:L/A:N

Weaknesses

CWE-436

Public exploit & PoC references

All references

Source data: NVD (nvd.nist.gov), public domain. Exploit-DB.ai adds local AI analysis for defensive use only.

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