An adversary can abuse an authentication protocol susceptible to reflection attack in order to defeat it. Doing so allows the adversary illegitimate access to the target system, without possessing the requisite credentials. Reflection attacks are of great concern to authentication protocols that rely on a challenge-handshake or similar mechanism. An adversary can impersonate a legitimate user and can gain illegitimate access to the system by successfully mounting a reflection attack during authentication.

https://capec.mitre.org/data/definitions/90.html

Related CWE definitions

Simple authentication protocols are subject to reflection attacks if a malicious user can use the target machine to impersonate a trusted user.
The requirements for the product dictate the use of an established authentication algorithm, but the implementation of the algorithm is incorrect.
Please note that CAPEC definitions are provided as a quick reference only. Visit http://capec.mitre.org/ for a complete list of CAPEC entries and more information.
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