Home/CWE/Incorrect Implementation of Authentication Algorithm
Weakness

Incorrect Implementation of Authentication Algorithm

CWE-303 · Base · Draft

The requirements for the product dictate the use of an established authentication algorithm, but the implementation of the algorithm is incorrect.

Extended description

This incorrect implementation may allow authentication to be bypassed.

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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
Children (more specific)
ParentOfCWE-304 · Missing Critical Step in Authentication
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Attack Patterns (CAPEC)

1
How adversaries exploit this weakness, per MITRE CAPEC.
CAPEC-90Reflection Attack in Authentication Protocol
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CVEs With This Weakness

82
A sample of the 82 CVEs tagged with this weakness.
CVECVE-2026-43640
CVECVE-2026-41103
CVECVE-2026-33190
CVECVE-2026-32953
CVECVE-2026-29515
CVECVE-2026-28446
CVECVE-2026-27656
CVECVE-2026-0999
CVECVE-2026-0073
CVECVE-2025-8881
CVECVE-2025-66489
CVECVE-2025-63210
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