Weaknesses of type CWE-340

55 results

Geração de números ou identificadores previsíveis

Ocorre quando o software usa um algoritmo fraco ou determinístico para gerar números aleatórios, tokens de sessão ou IDs únicos, permitindo que um atacante preveja os próximos valores. O risco é grave em autenticação, autorização e proteção de dados sensíveis, pois a previsibilidade compromete a segurança de toda a camada de controle de acesso.

Example

Um site gera tokens de sessão baseado em timestamp ou número sequencial: `token = timestamp + contador`. Um atacante observa alguns tokens válidos, identifica o padrão e cria tokens falsos para acessar contas de outros usuários sem credenciais legítimas.

How to mitigate

Use geradores criptograficamente seguros (como `secrets` em Python, `SecureRandom` em Java ou `crypto.getRandomValues()` em JavaScript) para criar tokens, UUIDs e IDs. Nunca use `Math.random()`, `rand()` ou funções baseadas em tempo ou sequência para fins de segurança.

CVE-2026-11374CRITICALAccount Takeover via Predictable SSO Ticket GenerationEPSS 2.5%CVE-2024-47945CRITICALPredictable Session IDEPSS 0.9%CVE-2025-69286HIGHRAGFlow has Predictable Token Generation Leading to Authentication Bypass VulnerabilityEPSS 0.8%CVE-2024-28957MEDIUMGeneration of predictable identifiers issue exists in Cente middleware TCP/IP Network Series. If this vulnerability is exploited, a remote uEPSS 0.8%CVE-2020-1905—Media ContentProvider URIs used for opening attachments in other apps were generated sequentially prior to WhatsApp for Android v2.20.185, wEPSS 0.6%CVE-2025-40931CRITICALApache::Session::Generate::MD5 versions through 1.94 for Perl create insecure session idEPSS 0.6%CVE-2026-13577HIGHDancer2 versions before 2.2.0 for Perl generate insecure session ids when required CSPRNG modules are unavailableEPSS 0.6%CVE-2026-3256CRITICALHTTP::Session versions before 0.54 for Perl defaults to using insecurely generated session idsEPSS 0.5%CVE-2024-52299HIGHThe PDF viewer macro allows accessing any attachment without access right checksEPSS 0.5%CVE-2026-9733CRITICALMojolicious::Plugin::Web::Auth::OAuth2 versions through 0.17 for Perl have an insecure default state parameterEPSS 0.5%CVE-2025-15604CRITICALAmon2 versions before 6.17 for Perl use an insecure random_string implementation for security functionsEPSS 0.5%CVE-2026-56016MEDIUMCGI::Session::ID::md5 versions before 4.49 for Perl generate predictable session ids from low-entropy sourcesEPSS 0.5%CVE-2024-7558HIGHJUJU_CONTEXT_ID is a predictable authentication secret. On a Juju machine (non-Kubernetes) or Juju charm container (on Kubernetes), an unpriEPSS 0.5%CVE-2025-10148MEDIUMpredictable WebSocket maskEPSS 0.5%CVE-2026-2473HIGHBucket Squatting in Vertex AI Experiments leads to RCE and Model Theft.EPSS 0.5%CVE-2025-59452MEDIUMThe YoSmart YoLink API through 2025-10-02 uses an endpoint URL that is derived from a device's MAC address along with an MD5 hash of non-secEPSS 0.4%CVE-2025-40926CRITICALPlack::Middleware::Session::Simple versions before 0.05 for Perl generates session ids insecurelyEPSS 0.4%CVE-2026-5083MEDIUMAdo::Sessions versions through 0.935 for Perl generates insecure session idsEPSS 0.4%CVE-2025-40920HIGHCatalyst::Authentication::Credential::HTTP versions 1.018 and earlier for Perl use insecurely generated noncesEPSS 0.4%CVE-2025-40918MEDIUMAuthen::SASL::Perl::DIGEST_MD5 versions 2.04 through 2.1800 for Perl generates the cnonce insecurelyEPSS 0.4%