Falhas do tipo CWE-303

109 resultados

Implementação incorreta de algoritmos de autenticação

Fraqueza que ocorre quando um desenvolvedor implementa mal um algoritmo de autenticação, introduzindo falhas lógicas que permitem bypass ou acesso não autorizado. Pode envolver erros na validação de credenciais, tratamento incorreto de tokens, criptografia fraca ou fluxos de autenticação vulneráveis.

Exemplo

Um sistema verifica se a senha está correta comparando strings sem usar funções de comparação seguras (timing-safe), permitindo ataques de timing onde o atacante infere a senha byte a byte observando diferenças no tempo de resposta. Ou ainda, um JWT validado apenas na estrutura, mas sem verificar a assinatura corretamente.

Como mitigar

Use bibliotecas criptográficas estabelecidas e auditadas em vez de implementar algoritmos manualmente. Faça code review rigoroso de qualquer código de autenticação, aplique testes de segurança específicos e valide contra padrões reconhecidos (OWASP, NIST) antes de ir para produção.

CVE-2022-33736A vulnerability has been identified in Opcenter Quality V13.1 (All versions < V13.1.20220624), Opcenter Quality V13.2 (All versions < V13.2.EPSS 1.3%CVE-2022-46146MEDIUMPrometheus Exporter Toolkit vulnerable to basic authentication bypassEPSS 1.2%CVE-2023-34274HIGHD-Link DIR-2150 LoginPassword Incorrect Implementation of Authentication Algorithm Authentication Bypass VulnerabilityEPSS 1.1%CVE-2023-34282HIGHD-Link DIR-2150 HNAP Incorrect Implementation of Authentication Algorithm Authentication Bypass VulnerabilityEPSS 1.1%CVE-2023-3326Network authentication attack via pam_krb5EPSS 1.1%CVE-2020-5268MEDIUMSubject Confirmation Method not validated in Saml2 Authentication Services for ASP.NETEPSS 1.1%CVE-2024-26248HIGHWindows Kerberos Elevation of Privilege VulnerabilityEPSS 1.0%CVE-2026-12773MEDIUMBerriAI litellm MCP Proxy user_api_key_auth_mcp.py UserAPIKeyAuth improper authenticationEPSS 1.0%CVE-2022-20923MEDIUMCisco Small Business RV110W, RV130, RV130W, and RV215W Routers IPSec VPN Server Authentication Bypass VulnerabilityEPSS 1.0%CVE-2022-39366CRITICALDataHub missing JWT signature checkEPSS 0.9%CVE-2023-44420HIGHD-Link DIR-X3260 prog.cgi Incorrect Implementation of Authentication Algorithm Authentication Bypass VulnerabilityEPSS 0.9%CVE-2023-29129CRITICALA vulnerability has been identified in Mendix SAML (Mendix 7 compatible) (All versions >= V1.17.3 < V1.18.0), Mendix SAML (Mendix 7 compatibEPSS 0.9%CVE-2025-66489CRITICALCal.com Authentication Bypass via bad TOTP + password checksEPSS 0.8%CVE-2024-56128MEDIUMApache Kafka: SCRAM authentication vulnerable to replay attacks when used without encryptionEPSS 0.8%CVE-2026-50360HIGHWindows SMB Server Elevation of Privilege VulnerabilityEPSS 0.8%CVE-2026-57852MEDIUMAuthentication Bypass via Null Short-Circuit in Grav CMS Scheduler Webhook Token CheckEPSS 0.7%CVE-2026-33557CRITICALApache Kafka: Missing JWT token validation in OAUTHBEARER authenticationEPSS 0.7%CVE-2021-42146HIGHAn issue was discovered in Contiki-NG tinyDTLS through master branch 53a0d97. DTLS servers allow remote attackers to reuse the same epoch nuEPSS 0.7%CVE-2026-28446CRITICALOpenClaw < 2026.2.1 - Inbound Allowlist Policy Bypass in voice-call Extension via Empty Caller ID and Suffix MatchingEPSS 0.7%CVE-2024-4332CRITICALImproper Authentication in Tripwire Enterprise 9.1.0 APIsEPSS 0.6%