Home/CWE/Authentication Bypass by Spoofing
Weakness

Authentication Bypass by Spoofing

CWE-290 · Base · Incomplete

This attack-focused weakness is caused by incorrectly implemented authentication schemes that are subject to spoofing attacks.

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Weakness Relationships

Where this weakness sits in the CWE hierarchy. Walk up to broader classes or down to more specific variants.
Parent of this (broader)
ChildOfCWE-1390 · Weak Authentication
ChildOfCWE-287 · Improper Authentication
Children (more specific)
ParentOfCWE-291 · Reliance on IP Address for Authentication
ParentOfCWE-293 · Using Referer Field for Authentication
ParentOfCWE-350 · Reliance on Reverse DNS Resolution for a Security-Critical Action
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Attack Patterns (CAPEC)

10
How adversaries exploit this weakness, per MITRE CAPEC.
CAPEC-21Exploitation of Trusted Identifiers
CAPEC-22Exploiting Trust in Client
CAPEC-459Creating a Rogue Certification Authority Certificate
CAPEC-461Web Services API Signature Forgery Leveraging Hash Function Extension Weakness
CAPEC-473Signature Spoof
CAPEC-476Signature Spoofing by Misrepresentation
CAPEC-59Session Credential Falsification through Prediction
CAPEC-60Reusing Session IDs (aka Session Replay)
CAPEC-667Bluetooth Impersonation AttackS (BIAS)
CAPEC-94Adversary in the Middle (AiTM)
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CVEs With This Weakness

641
A sample of the 641 CVEs tagged with this weakness.
CVECVE-2026-7422
CVECVE-2026-6762
CVECVE-2026-6213
CVECVE-2026-4728
CVECVE-2026-46356
CVECVE-2026-45223
CVECVE-2026-44183
CVECVE-2026-44118
CVECVE-2026-42602
CVECVE-2026-42354
CVECVE-2026-40575
CVECVE-2026-40460
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Nuclei Scanner Templates

4
Open-source Nuclei templates that detect this weakness class - an actionable scan-for-it pivot. Licensed under the ProjectDiscovery / Nuclei terms.
criticalZabbix - SAML SSO Authentication Bypass
criticalApache APISIX - Remote Code Execution
criticalNacos <1.4.1 - Authentication Bypass
highDataEase - Remote Code Execution
External lookups - second-class, for what we don’t hold ourselves
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